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1 /* |
1 /* |
2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
5 * This code is free software; you can redistribute it and/or modify it |
6 * under the terms of the GNU General Public License version 2 only, as |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
20 * or visit www.oracle.com if you need additional information or have any |
20 * or visit www.oracle.com if you need additional information or have any |
21 * questions. |
21 * questions. |
22 * |
22 * |
23 */ |
23 */ |
24 |
24 |
25 #ifndef OS_CPU_SOLARIS_X86_VM_COUNTTRAILINGZEROS_HPP |
25 #ifndef OS_CPU_SOLARIS_X86_COUNT_TRAILING_ZEROS_SOLARIS_X86_HPP |
26 #define OS_CPU_SOLARIS_X86_VM_COUNTTRAILINGZEROS_HPP |
26 #define OS_CPU_SOLARIS_X86_COUNT_TRAILING_ZEROS_SOLARIS_X86_HPP |
27 |
27 |
28 #include "utilities/globalDefinitions.hpp" |
28 #include "utilities/globalDefinitions.hpp" |
29 |
29 |
30 inline unsigned count_trailing_zeros(uintx x) { |
30 inline unsigned count_trailing_zeros(uintx x) { |
31 assert(x != 0, "precondition"); |
31 assert(x != 0, "precondition"); |
32 uintx result; |
32 uintx result; |
33 __asm__(" rep bsfq %1, %0" : "=r" (result) : "rm" (x)); |
33 __asm__(" rep bsfq %1, %0" : "=r" (result) : "rm" (x)); |
34 return result; |
34 return result; |
35 } |
35 } |
36 |
36 |
37 #endif // include guard |
37 #endif // OS_CPU_SOLARIS_X86_COUNT_TRAILING_ZEROS_SOLARIS_X86_HPP |