author | bpb |
Wed, 05 Jun 2013 21:01:02 -0700 | |
changeset 18143 | b6ef7bd945ce |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
18143
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
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1 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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2 |
* Copyright (c) 1996, 2012, Oracle and/or its affiliates. All rights reserved. |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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5 |
* This code is free software; you can redistribute it and/or modify it |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* under the terms of the GNU General Public License version 2 only, as |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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7 |
* published by the Free Software Foundation. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* This code is distributed in the hope that it will be useful, but WITHOUT |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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11 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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12 |
* version 2 for more details (a copy is included in the LICENSE file that |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* accompanied this code). |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* You should have received a copy of the GNU General Public License version |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* 2 along with this work; if not, write to the Free Software Foundation, |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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17 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* or visit www.oracle.com if you need additional information or have any |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* questions. |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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*/ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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//package sun.misc; |
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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/* |
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* A really, really simple bigint package |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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* tailored to the needs of floating base conversion. |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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*/ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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class OldFDBigIntForTest { |
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int nWords; // number of words used |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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int data[]; // value: data[0] is least significant |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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public OldFDBigIntForTest( int v ){ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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nWords = 1; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data = new int[1]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data[0] = v; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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public OldFDBigIntForTest( long v ){ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data = new int[2]; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data[0] = (int)v; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data[1] = (int)(v>>>32); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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nWords = (data[1]==0) ? 1 : 2; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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public OldFDBigIntForTest( OldFDBigIntForTest other ){ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data = new int[nWords = other.nWords]; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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System.arraycopy( other.data, 0, data, 0, nWords ); |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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private OldFDBigIntForTest( int [] d, int n ){ |
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data = d; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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nWords = n; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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public OldFDBigIntForTest( long seed, char digit[], int nd0, int nd ){ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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int n= (nd+8)/9; // estimate size needed. |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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if ( n < 2 ) n = 2; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data = new int[n]; // allocate enough space |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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data[0] = (int)seed; // starting value |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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63 |
data[1] = (int)(seed>>>32); |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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nWords = (data[1]==0) ? 1 : 2; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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65 |
int i = nd0; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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int limit = nd-5; // slurp digits 5 at a time. |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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int v; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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while ( i < limit ){ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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int ilim = i+5; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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v = (int)digit[i++]-(int)'0'; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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while( i <ilim ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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v = 10*v + (int)digit[i++]-(int)'0'; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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73 |
} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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74 |
multaddMe( 100000, v); // ... where 100000 is 10^5. |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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75 |
} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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76 |
int factor = 1; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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77 |
v = 0; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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78 |
while ( i < nd ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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79 |
v = 10*v + (int)digit[i++]-(int)'0'; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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80 |
factor *= 10; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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81 |
} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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82 |
if ( factor != 1 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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83 |
multaddMe( factor, v ); |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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84 |
} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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85 |
} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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86 |
|
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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87 |
/* |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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88 |
* Left shift by c bits. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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89 |
* Shifts this in place. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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90 |
*/ |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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91 |
public void |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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92 |
lshiftMe( int c )throws IllegalArgumentException { |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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93 |
if ( c <= 0 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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94 |
if ( c == 0 ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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95 |
return; // silly. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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96 |
else |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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97 |
throw new IllegalArgumentException("negative shift count"); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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98 |
} |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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changeset
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99 |
int wordcount = c>>5; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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changeset
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100 |
int bitcount = c & 0x1f; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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changeset
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101 |
int anticount = 32-bitcount; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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102 |
int t[] = data; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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103 |
int s[] = data; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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changeset
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104 |
if ( nWords+wordcount+1 > t.length ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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105 |
// reallocate. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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106 |
t = new int[ nWords+wordcount+1 ]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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107 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
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108 |
int target = nWords+wordcount; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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changeset
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109 |
int src = nWords-1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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changeset
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110 |
if ( bitcount == 0 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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111 |
// special hack, since an anticount of 32 won't go! |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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112 |
System.arraycopy( s, 0, t, wordcount, nWords ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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113 |
target = wordcount-1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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114 |
} else { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
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115 |
t[target--] = s[src]>>>anticount; |
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7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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changeset
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116 |
while ( src >= 1 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
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parents:
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117 |
t[target--] = (s[src]<<bitcount) | (s[--src]>>>anticount); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
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changeset
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118 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
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119 |
t[target--] = s[src]<<bitcount; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
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changeset
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120 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
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121 |
while( target >= 0 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
122 |
t[target--] = 0; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
123 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
124 |
data = t; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
125 |
nWords += wordcount + 1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
126 |
// may have constructed high-order word of 0. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
127 |
// if so, trim it |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
128 |
while ( nWords > 1 && data[nWords-1] == 0 ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
129 |
nWords--; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
130 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
131 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
132 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
133 |
* normalize this number by shifting until |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
134 |
* the MSB of the number is at 0x08000000. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
135 |
* This is in preparation for quoRemIteration, below. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
136 |
* The idea is that, to make division easier, we want the |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
137 |
* divisor to be "normalized" -- usually this means shifting |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
138 |
* the MSB into the high words sign bit. But because we know that |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
139 |
* the quotient will be 0 < q < 10, we would like to arrange that |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
140 |
* the dividend not span up into another word of precision. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
141 |
* (This needs to be explained more clearly!) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
142 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
143 |
public int |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
144 |
normalizeMe() throws IllegalArgumentException { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
145 |
int src; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
146 |
int wordcount = 0; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
147 |
int bitcount = 0; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
148 |
int v = 0; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
149 |
for ( src= nWords-1 ; src >= 0 && (v=data[src]) == 0 ; src--){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
150 |
wordcount += 1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
151 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
152 |
if ( src < 0 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
153 |
// oops. Value is zero. Cannot normalize it! |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
154 |
throw new IllegalArgumentException("zero value"); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
155 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
156 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
157 |
* In most cases, we assume that wordcount is zero. This only |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
158 |
* makes sense, as we try not to maintain any high-order |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
159 |
* words full of zeros. In fact, if there are zeros, we will |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
160 |
* simply SHORTEN our number at this point. Watch closely... |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
161 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
162 |
nWords -= wordcount; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
163 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
164 |
* Compute how far left we have to shift v s.t. its highest- |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
165 |
* order bit is in the right place. Then call lshiftMe to |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
166 |
* do the work. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
167 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
168 |
if ( (v & 0xf0000000) != 0 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
169 |
// will have to shift up into the next word. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
170 |
// too bad. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
171 |
for( bitcount = 32 ; (v & 0xf0000000) != 0 ; bitcount-- ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
172 |
v >>>= 1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
173 |
} else { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
174 |
while ( v <= 0x000fffff ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
175 |
// hack: byte-at-a-time shifting |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
176 |
v <<= 8; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
177 |
bitcount += 8; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
178 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
179 |
while ( v <= 0x07ffffff ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
180 |
v <<= 1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
181 |
bitcount += 1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
182 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
183 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
184 |
if ( bitcount != 0 ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
185 |
lshiftMe( bitcount ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
186 |
return bitcount; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
187 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
188 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
189 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
190 |
* Multiply a OldFDBigIntForTest by an int. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
191 |
* Result is a new OldFDBigIntForTest. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
192 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
193 |
public OldFDBigIntForTest |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
194 |
mult( int iv ) { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
195 |
long v = iv; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
196 |
int r[]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
197 |
long p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
198 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
199 |
// guess adequate size of r. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
200 |
r = new int[ ( v * ((long)data[nWords-1]&0xffffffffL) > 0xfffffffL ) ? nWords+1 : nWords ]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
201 |
p = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
202 |
for( int i=0; i < nWords; i++ ) { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
203 |
p += v * ((long)data[i]&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
204 |
r[i] = (int)p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
205 |
p >>>= 32; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
206 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
207 |
if ( p == 0L){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
208 |
return new OldFDBigIntForTest( r, nWords ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
209 |
} else { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
210 |
r[nWords] = (int)p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
211 |
return new OldFDBigIntForTest( r, nWords+1 ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
212 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
213 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
214 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
215 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
216 |
* Multiply a OldFDBigIntForTest by an int and add another int. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
217 |
* Result is computed in place. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
218 |
* Hope it fits! |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
219 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
220 |
public void |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
221 |
multaddMe( int iv, int addend ) { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
222 |
long v = iv; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
223 |
long p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
224 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
225 |
// unroll 0th iteration, doing addition. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
226 |
p = v * ((long)data[0]&0xffffffffL) + ((long)addend&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
227 |
data[0] = (int)p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
228 |
p >>>= 32; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
229 |
for( int i=1; i < nWords; i++ ) { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
230 |
p += v * ((long)data[i]&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
231 |
data[i] = (int)p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
232 |
p >>>= 32; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
233 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
234 |
if ( p != 0L){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
235 |
data[nWords] = (int)p; // will fail noisily if illegal! |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
236 |
nWords++; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
237 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
238 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
239 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
240 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
241 |
* Multiply a OldFDBigIntForTest by another OldFDBigIntForTest. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
242 |
* Result is a new OldFDBigIntForTest. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
243 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
244 |
public OldFDBigIntForTest |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
245 |
mult( OldFDBigIntForTest other ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
246 |
// crudely guess adequate size for r |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
247 |
int r[] = new int[ nWords + other.nWords ]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
248 |
int i; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
249 |
// I think I am promised zeros... |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
250 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
251 |
for( i = 0; i < this.nWords; i++ ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
252 |
long v = (long)this.data[i] & 0xffffffffL; // UNSIGNED CONVERSION |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
253 |
long p = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
254 |
int j; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
255 |
for( j = 0; j < other.nWords; j++ ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
256 |
p += ((long)r[i+j]&0xffffffffL) + v*((long)other.data[j]&0xffffffffL); // UNSIGNED CONVERSIONS ALL 'ROUND. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
257 |
r[i+j] = (int)p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
258 |
p >>>= 32; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
259 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
260 |
r[i+j] = (int)p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
261 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
262 |
// compute how much of r we actually needed for all that. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
263 |
for ( i = r.length-1; i> 0; i--) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
264 |
if ( r[i] != 0 ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
265 |
break; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
266 |
return new OldFDBigIntForTest( r, i+1 ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
267 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
268 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
269 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
270 |
* Add one OldFDBigIntForTest to another. Return a OldFDBigIntForTest |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
271 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
272 |
public OldFDBigIntForTest |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
273 |
add( OldFDBigIntForTest other ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
274 |
int i; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
275 |
int a[], b[]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
276 |
int n, m; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
277 |
long c = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
278 |
// arrange such that a.nWords >= b.nWords; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
279 |
// n = a.nWords, m = b.nWords |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
280 |
if ( this.nWords >= other.nWords ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
281 |
a = this.data; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
282 |
n = this.nWords; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
283 |
b = other.data; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
284 |
m = other.nWords; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
285 |
} else { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
286 |
a = other.data; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
287 |
n = other.nWords; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
288 |
b = this.data; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
289 |
m = this.nWords; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
290 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
291 |
int r[] = new int[ n ]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
292 |
for ( i = 0; i < n; i++ ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
293 |
c += (long)a[i] & 0xffffffffL; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
294 |
if ( i < m ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
295 |
c += (long)b[i] & 0xffffffffL; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
296 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
297 |
r[i] = (int) c; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
298 |
c >>= 32; // signed shift. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
299 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
300 |
if ( c != 0L ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
301 |
// oops -- carry out -- need longer result. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
302 |
int s[] = new int[ r.length+1 ]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
303 |
System.arraycopy( r, 0, s, 0, r.length ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
304 |
s[i++] = (int)c; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
305 |
return new OldFDBigIntForTest( s, i ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
306 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
307 |
return new OldFDBigIntForTest( r, i ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
308 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
309 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
310 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
311 |
* Subtract one OldFDBigIntForTest from another. Return a OldFDBigIntForTest |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
312 |
* Assert that the result is positive. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
313 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
314 |
public OldFDBigIntForTest |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
315 |
sub( OldFDBigIntForTest other ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
316 |
int r[] = new int[ this.nWords ]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
317 |
int i; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
318 |
int n = this.nWords; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
319 |
int m = other.nWords; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
320 |
int nzeros = 0; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
321 |
long c = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
322 |
for ( i = 0; i < n; i++ ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
323 |
c += (long)this.data[i] & 0xffffffffL; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
324 |
if ( i < m ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
325 |
c -= (long)other.data[i] & 0xffffffffL; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
326 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
327 |
if ( ( r[i] = (int) c ) == 0 ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
328 |
nzeros++; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
329 |
else |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
330 |
nzeros = 0; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
331 |
c >>= 32; // signed shift |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
332 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
333 |
assert c == 0L : c; // borrow out of subtract |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
334 |
assert dataInRangeIsZero(i, m, other); // negative result of subtract |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
335 |
return new OldFDBigIntForTest( r, n-nzeros ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
336 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
337 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
338 |
private static boolean dataInRangeIsZero(int i, int m, OldFDBigIntForTest other) { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
339 |
while ( i < m ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
340 |
if (other.data[i++] != 0) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
341 |
return false; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
342 |
return true; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
343 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
344 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
345 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
346 |
* Compare OldFDBigIntForTest with another OldFDBigIntForTest. Return an integer |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
347 |
* >0: this > other |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
348 |
* 0: this == other |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
349 |
* <0: this < other |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
350 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
351 |
public int |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
352 |
cmp( OldFDBigIntForTest other ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
353 |
int i; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
354 |
if ( this.nWords > other.nWords ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
355 |
// if any of my high-order words is non-zero, |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
356 |
// then the answer is evident |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
357 |
int j = other.nWords-1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
358 |
for ( i = this.nWords-1; i > j ; i-- ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
359 |
if ( this.data[i] != 0 ) return 1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
360 |
}else if ( this.nWords < other.nWords ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
361 |
// if any of other's high-order words is non-zero, |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
362 |
// then the answer is evident |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
363 |
int j = this.nWords-1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
364 |
for ( i = other.nWords-1; i > j ; i-- ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
365 |
if ( other.data[i] != 0 ) return -1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
366 |
} else{ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
367 |
i = this.nWords-1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
368 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
369 |
for ( ; i > 0 ; i-- ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
370 |
if ( this.data[i] != other.data[i] ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
371 |
break; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
372 |
// careful! want unsigned compare! |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
373 |
// use brute force here. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
374 |
int a = this.data[i]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
375 |
int b = other.data[i]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
376 |
if ( a < 0 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
377 |
// a is really big, unsigned |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
378 |
if ( b < 0 ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
379 |
return a-b; // both big, negative |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
380 |
} else { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
381 |
return 1; // b not big, answer is obvious; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
382 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
383 |
} else { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
384 |
// a is not really big |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
385 |
if ( b < 0 ) { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
386 |
// but b is really big |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
387 |
return -1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
388 |
} else { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
389 |
return a - b; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
390 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
391 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
392 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
393 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
394 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
395 |
* Compute |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
396 |
* q = (int)( this / S ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
397 |
* this = 10 * ( this mod S ) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
398 |
* Return q. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
399 |
* This is the iteration step of digit development for output. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
400 |
* We assume that S has been normalized, as above, and that |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
401 |
* "this" has been lshift'ed accordingly. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
402 |
* Also assume, of course, that the result, q, can be expressed |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
403 |
* as an integer, 0 <= q < 10. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
404 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
405 |
public int |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
406 |
quoRemIteration( OldFDBigIntForTest S )throws IllegalArgumentException { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
407 |
// ensure that this and S have the same number of |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
408 |
// digits. If S is properly normalized and q < 10 then |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
409 |
// this must be so. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
410 |
if ( nWords != S.nWords ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
411 |
throw new IllegalArgumentException("disparate values"); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
412 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
413 |
// estimate q the obvious way. We will usually be |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
414 |
// right. If not, then we're only off by a little and |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
415 |
// will re-add. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
416 |
int n = nWords-1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
417 |
long q = ((long)data[n]&0xffffffffL) / (long)S.data[n]; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
418 |
long diff = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
419 |
for ( int i = 0; i <= n ; i++ ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
420 |
diff += ((long)data[i]&0xffffffffL) - q*((long)S.data[i]&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
421 |
data[i] = (int)diff; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
422 |
diff >>= 32; // N.B. SIGNED shift. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
423 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
424 |
if ( diff != 0L ) { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
425 |
// damn, damn, damn. q is too big. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
426 |
// add S back in until this turns +. This should |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
427 |
// not be very many times! |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
428 |
long sum = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
429 |
while ( sum == 0L ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
430 |
sum = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
431 |
for ( int i = 0; i <= n; i++ ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
432 |
sum += ((long)data[i]&0xffffffffL) + ((long)S.data[i]&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
433 |
data[i] = (int) sum; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
434 |
sum >>= 32; // Signed or unsigned, answer is 0 or 1 |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
435 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
436 |
/* |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
437 |
* Originally the following line read |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
438 |
* "if ( sum !=0 && sum != -1 )" |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
439 |
* but that would be wrong, because of the |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
440 |
* treatment of the two values as entirely unsigned, |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
441 |
* it would be impossible for a carry-out to be interpreted |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
442 |
* as -1 -- it would have to be a single-bit carry-out, or |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
443 |
* +1. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
444 |
*/ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
445 |
assert sum == 0 || sum == 1 : sum; // carry out of division correction |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
446 |
q -= 1; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
447 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
448 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
449 |
// finally, we can multiply this by 10. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
450 |
// it cannot overflow, right, as the high-order word has |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
451 |
// at least 4 high-order zeros! |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
452 |
long p = 0L; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
453 |
for ( int i = 0; i <= n; i++ ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
454 |
p += 10*((long)data[i]&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
455 |
data[i] = (int)p; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
456 |
p >>= 32; // SIGNED shift. |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
457 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
458 |
assert p == 0L : p; // Carry out of *10 |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
459 |
return (int)q; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
460 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
461 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
462 |
public long |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
463 |
longValue(){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
464 |
// if this can be represented as a long, return the value |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
465 |
assert this.nWords > 0 : this.nWords; // longValue confused |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
466 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
467 |
if (this.nWords == 1) |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
468 |
return ((long)data[0]&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
469 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
470 |
assert dataInRangeIsZero(2, this.nWords, this); // value too big |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
471 |
assert data[1] >= 0; // value too big |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
472 |
return ((long)(data[1]) << 32) | ((long)data[0]&0xffffffffL); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
473 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
474 |
|
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
475 |
public String |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
476 |
toString() { |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
477 |
StringBuffer r = new StringBuffer(30); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
478 |
r.append('['); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
479 |
int i = Math.min( nWords-1, data.length-1) ; |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
480 |
if ( nWords > data.length ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
481 |
r.append( "("+data.length+"<"+nWords+"!)" ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
482 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
483 |
for( ; i> 0 ; i-- ){ |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
484 |
r.append( Integer.toHexString( data[i] ) ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
485 |
r.append(' '); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
486 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
487 |
r.append( Integer.toHexString( data[0] ) ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
488 |
r.append(']'); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
489 |
return new String( r ); |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
490 |
} |
b6ef7bd945ce
7032154: Performance tuning of sun.misc.FloatingDecimal/FormattedFloatingDecimal
bpb
parents:
diff
changeset
|
491 |
} |