# HG changeset patch
# User jcm
# Date 1562311494 25200
# Node ID a30c86af2eb7dbc03bd933bb0b43f4f25bb44cf1
# Parent  3868dde58ebb411f99419d5c9f830977730eace6
8226627: assert(t->singleton()) failed: must be a constant
Summary: Implemented constant folding for MaxFD, MinFD.
Reviewed-by: thartmann, bsrbnd, pli

diff -r 3868dde58ebb -r a30c86af2eb7 src/hotspot/share/opto/addnode.cpp
--- a/src/hotspot/share/opto/addnode.cpp	Mon Jun 10 13:04:12 2019 +0200
+++ b/src/hotspot/share/opto/addnode.cpp	Fri Jul 05 00:24:54 2019 -0700
@@ -929,3 +929,91 @@
   // Otherwise just MIN them bits.
   return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) );
 }
+
+//------------------------------add_ring---------------------------------------
+const Type *MinFNode::add_ring( const Type *t0, const Type *t1 ) const {
+  const TypeF *r0 = t0->is_float_constant();
+  const TypeF *r1 = t1->is_float_constant();
+
+  if (r0->is_nan()) {
+    return r0;
+  }
+  if (r1->is_nan()) {
+    return r1;
+  }
+
+  float f0 = r0->getf();
+  float f1 = r1->getf();
+  if (f0 != 0.0f || f1 != 0.0f) {
+    return f0 < f1 ? r0 : r1;
+  }
+
+  // handle min of 0.0, -0.0 case.
+  return (jint_cast(f0) < jint_cast(f1)) ? r0 : r1;
+}
+
+//------------------------------add_ring---------------------------------------
+const Type *MinDNode::add_ring( const Type *t0, const Type *t1 ) const {
+  const TypeD *r0 = t0->is_double_constant();
+  const TypeD *r1 = t1->is_double_constant();
+
+  if (r0->is_nan()) {
+    return r0;
+  }
+  if (r1->is_nan()) {
+    return r1;
+  }
+
+  double d0 = r0->getd();
+  double d1 = r1->getd();
+  if (d0 != 0.0 || d1 != 0.0) {
+    return d0 < d1 ? r0 : r1;
+  }
+
+  // handle min of 0.0, -0.0 case.
+  return (jlong_cast(d0) < jlong_cast(d1)) ? r0 : r1;
+}
+
+//------------------------------add_ring---------------------------------------
+const Type *MaxFNode::add_ring( const Type *t0, const Type *t1 ) const {
+  const TypeF *r0 = t0->is_float_constant();
+  const TypeF *r1 = t1->is_float_constant();
+
+  if (r0->is_nan()) {
+    return r0;
+  }
+  if (r1->is_nan()) {
+    return r1;
+  }
+
+  float f0 = r0->getf();
+  float f1 = r1->getf();
+  if (f0 != 0.0f || f1 != 0.0f) {
+    return f0 > f1 ? r0 : r1;
+  }
+
+  // handle max of 0.0,-0.0 case.
+  return (jint_cast(f0) > jint_cast(f1)) ? r0 : r1;
+}
+
+//------------------------------add_ring---------------------------------------
+const Type *MaxDNode::add_ring( const Type *t0, const Type *t1 ) const {
+  const TypeD *r0 = t0->is_double_constant();
+  const TypeD *r1 = t1->is_double_constant();
+
+  if (r0->is_nan()) {
+    return r0;
+  }
+  if (r1->is_nan()) {
+    return r1;
+  }
+
+  double d0 = r0->getd();
+  double d1 = r1->getd();
+  if (d0 != 0.0 || d1 != 0.0) {
+    return d0 > d1 ? r0 : r1;
+  }
+
+  // handle max of 0.0, -0.0 case.
+  return (jlong_cast(d0) > jlong_cast(d1)) ? r0 : r1;
+}
diff -r 3868dde58ebb -r a30c86af2eb7 src/hotspot/share/opto/addnode.hpp
--- a/src/hotspot/share/opto/addnode.hpp	Mon Jun 10 13:04:12 2019 +0200
+++ b/src/hotspot/share/opto/addnode.hpp	Fri Jul 05 00:24:54 2019 -0700
@@ -255,7 +255,7 @@
 public:
   MaxFNode(Node *in1, Node *in2) : MaxNode(in1, in2) {}
   virtual int Opcode() const;
-  virtual const Type *add_ring(const Type*, const Type*) const { return Type::FLOAT; }
+  virtual const Type *add_ring(const Type*, const Type*) const;
   virtual const Type *add_id() const { return TypeF::NEG_INF; }
   virtual const Type *bottom_type() const { return Type::FLOAT; }
   virtual uint ideal_reg() const { return Op_RegF; }
@@ -267,7 +267,7 @@
 public:
   MinFNode(Node *in1, Node *in2) : MaxNode(in1, in2) {}
   virtual int Opcode() const;
-  virtual const Type *add_ring(const Type*, const Type*) const { return Type::FLOAT; }
+  virtual const Type *add_ring(const Type*, const Type*) const;
   virtual const Type *add_id() const { return TypeF::POS_INF; }
   virtual const Type *bottom_type() const { return Type::FLOAT; }
   virtual uint ideal_reg() const { return Op_RegF; }
@@ -279,7 +279,7 @@
 public:
   MaxDNode(Node *in1, Node *in2) : MaxNode(in1, in2) {}
   virtual int Opcode() const;
-  virtual const Type *add_ring(const Type*, const Type*) const { return Type::DOUBLE; }
+  virtual const Type *add_ring(const Type*, const Type*) const;
   virtual const Type *add_id() const { return TypeD::NEG_INF; }
   virtual const Type *bottom_type() const { return Type::DOUBLE; }
   virtual uint ideal_reg() const { return Op_RegD; }
@@ -291,7 +291,7 @@
 public:
   MinDNode(Node *in1, Node *in2) : MaxNode(in1, in2) {}
   virtual int Opcode() const;
-  virtual const Type *add_ring(const Type*, const Type*) const { return Type::DOUBLE; }
+  virtual const Type *add_ring(const Type*, const Type*) const;
   virtual const Type *add_id() const { return TypeD::POS_INF; }
   virtual const Type *bottom_type() const { return Type::DOUBLE; }
   virtual uint ideal_reg() const { return Op_RegD; }
diff -r 3868dde58ebb -r a30c86af2eb7 src/hotspot/share/opto/library_call.cpp
--- a/src/hotspot/share/opto/library_call.cpp	Mon Jun 10 13:04:12 2019 +0200
+++ b/src/hotspot/share/opto/library_call.cpp	Fri Jul 05 00:24:54 2019 -0700
@@ -6696,9 +6696,6 @@
     fatal_unexpected_iid(id);
     break;
   }
-  if (a->is_Con() || b->is_Con()) {
-    return false;
-  }
   switch (id) {
   case vmIntrinsics::_maxF:  n = new MaxFNode(a, b);  break;
   case vmIntrinsics::_minF:  n = new MinFNode(a, b);  break;
diff -r 3868dde58ebb -r a30c86af2eb7 src/hotspot/share/opto/type.cpp
--- a/src/hotspot/share/opto/type.cpp	Mon Jun 10 13:04:12 2019 +0200
+++ b/src/hotspot/share/opto/type.cpp	Fri Jul 05 00:24:54 2019 -0700
@@ -411,18 +411,8 @@
 }
 
 #define SMALLINT ((juint)3)  // a value too insignificant to consider widening
-
-static double pos_dinf() {
-  union { int64_t i; double d; } v;
-  v.i = CONST64(0x7ff0000000000000);
-  return v.d;
-}
-
-static float pos_finf() {
-  union { int32_t i; float f; } v;
-  v.i = 0x7f800000;
-  return v.f;
-}
+#define POSITIVE_INFINITE_F 0x7f800000 // hex representation for IEEE 754 single precision positive infinite
+#define POSITIVE_INFINITE_D 0x7ff0000000000000 // hex representation for IEEE 754 double precision positive infinite
 
 //--------------------------Initialize_shared----------------------------------
 void Type::Initialize_shared(Compile* current) {
@@ -453,13 +443,13 @@
 
   TypeF::ZERO = TypeF::make(0.0); // Float 0 (positive zero)
   TypeF::ONE  = TypeF::make(1.0); // Float 1
-  TypeF::POS_INF = TypeF::make(pos_finf());
-  TypeF::NEG_INF = TypeF::make(-pos_finf());
+  TypeF::POS_INF = TypeF::make(jfloat_cast(POSITIVE_INFINITE_F));
+  TypeF::NEG_INF = TypeF::make(-jfloat_cast(POSITIVE_INFINITE_F));
 
   TypeD::ZERO = TypeD::make(0.0); // Double 0 (positive zero)
   TypeD::ONE  = TypeD::make(1.0); // Double 1
-  TypeD::POS_INF = TypeD::make(pos_dinf());
-  TypeD::NEG_INF = TypeD::make(-pos_dinf());
+  TypeD::POS_INF = TypeD::make(jdouble_cast(POSITIVE_INFINITE_D));
+  TypeD::NEG_INF = TypeD::make(-jdouble_cast(POSITIVE_INFINITE_D));
 
   TypeInt::MINUS_1 = TypeInt::make(-1);  // -1
   TypeInt::ZERO    = TypeInt::make( 0);  //  0