[turbofan] Allow 0.0 as immediate for floating-point comparison on arm/arm64.

test/unittests/compiler/arm64/instruction-selector-arm64-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/unittests/compiler/instruction-selector-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 1500 matching lines @@
   Stream s = m.Build();
   ASSERT_EQ(1U, s.size());
   EXPECT_EQ(cmp.mi.arch_opcode, s[0]->arch_opcode());
   EXPECT_EQ(2U, s[0]->InputCount());
   EXPECT_EQ(1U, s[0]->OutputCount());
   EXPECT_EQ(kFlags_set, s[0]->flags_mode());
   EXPECT_EQ(cmp.cond, s[0]->flags_condition());
 }
 
 
+TEST_P(InstructionSelectorFPCmpTest, WithImmediateZeroOnRight) {
+  const FPCmp cmp = GetParam();
+  StreamBuilder m(this, kMachInt32, cmp.mi.machine_type);
+  m.Return((m.*cmp.mi.constructor)(m.Parameter(0), m.Float64Constant(0.0)));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(cmp.mi.arch_opcode, s[0]->arch_opcode());
+  EXPECT_EQ(2U, s[0]->InputCount());
+  EXPECT_TRUE(s[0]->InputAt(1)->IsImmediate());
+  EXPECT_EQ(1U, s[0]->OutputCount());
+  EXPECT_EQ(kFlags_set, s[0]->flags_mode());
+  EXPECT_EQ(cmp.cond, s[0]->flags_condition());
+}
+
+
 INSTANTIATE_TEST_CASE_P(InstructionSelectorTest, InstructionSelectorFPCmpTest,
                         ::testing::ValuesIn(kFPCmpInstructions));
 
 
+TEST_F(InstructionSelectorTest, Float64EqualWithImmediateZeroOnLeft) {
+  StreamBuilder m(this, kMachInt32, kMachFloat64);
+  m.Return(m.Float64Equal(m.Float64Constant(0.0), m.Parameter(0)));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kArm64Float64Cmp, s[0]->arch_opcode());
+  EXPECT_EQ(2U, s[0]->InputCount());
+  EXPECT_TRUE(s[0]->InputAt(1)->IsImmediate());
+  EXPECT_EQ(1U, s[0]->OutputCount());
+  EXPECT_EQ(kFlags_set, s[0]->flags_mode());
+  EXPECT_EQ(kEqual, s[0]->flags_condition());
+}
+
+
 // -----------------------------------------------------------------------------
 // Conversions.
 
 typedef InstructionSelectorTestWithParam<Conversion>
     InstructionSelectorConversionTest;
 
 
 TEST_P(InstructionSelectorConversionTest, Parameter) {
   const Conversion conv = GetParam();
   StreamBuilder m(this, conv.mi.machine_type, conv.src_machine_type);
@@ skipping 632 matching lines @@
     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(r), s.ToVreg(s[0]->Output()));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8