[ia32] Match -0 - x with sign bit flip.

test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc

Index: test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
diff --git a/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc b/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
index 6c4ca9cbf6740b1a5c06bec88e8162630e5e9e90..d871c702525a48d36a1134c7d094214db322fa6c 100644
--- a/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
+++ b/test/unittests/compiler/ia32/instruction-selector-ia32-unittest.cc
@@ -635,6 +635,10 @@ TEST_F(InstructionSelectorTest, Int32MulHigh) {
 }
 
 
+// -----------------------------------------------------------------------------
+// Floating point operations.
+
+
 TEST_F(InstructionSelectorTest, Float64BinopArithmetic) {
   {
     StreamBuilder m(this, kMachFloat64, kMachFloat64, kMachFloat64);
@@ -667,6 +671,38 @@ TEST_F(InstructionSelectorTest, Float64BinopArithmetic) {
 }
 
 
+TEST_F(InstructionSelectorTest, Float32SubWithMinusZeroAndParameter) {
+  StreamBuilder m(this, kMachFloat32, kMachFloat32);
+  Node* const p0 = m.Parameter(0);
+  Node* const n = m.Float32Sub(m.Float32Constant(-0.0f), p0);
+  m.Return(n);
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kSSEFloat32Neg, s[0]->arch_opcode());
+  ASSERT_EQ(1U, s[0]->InputCount());
+  EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
+  ASSERT_EQ(1U, s[0]->OutputCount());
+  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
+  EXPECT_EQ(kFlags_none, s[0]->flags_mode());
+}
+
+
+TEST_F(InstructionSelectorTest, Float64SubWithMinusZeroAndParameter) {
+  StreamBuilder m(this, kMachFloat64, kMachFloat64);
+  Node* const p0 = m.Parameter(0);
+  Node* const n = m.Float64Sub(m.Float64Constant(-0.0), p0);
+  m.Return(n);
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kSSEFloat64Neg, s[0]->arch_opcode());
+  ASSERT_EQ(1U, s[0]->InputCount());
+  EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
+  ASSERT_EQ(1U, s[0]->OutputCount());
+  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
+  EXPECT_EQ(kFlags_none, s[0]->flags_mode());
+}
+
+
 // -----------------------------------------------------------------------------
 // Miscellaneous.