[turbofan] Elide fp32 convert for const compares

src/compiler/arm/code-generator-arm.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 "src/compiler/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 554 matching lines @@
       __ teq(i.InputRegister(0), i.InputOperand2(1));
       DCHECK_EQ(SetCC, i.OutputSBit());
       break;
     case kArmVcmpF32:
       if (instr->InputAt(1)->IsDoubleRegister()) {
         __ VFPCompareAndSetFlags(i.InputFloat32Register(0),
                                  i.InputFloat32Register(1));
       } else {
         DCHECK(instr->InputAt(1)->IsImmediate());
         // 0.0 is the only immediate supported by vcmp instructions.
-        DCHECK(i.InputDouble(1) == 0.0);
-        __ VFPCompareAndSetFlags(i.InputFloat32Register(0), i.InputDouble(1));
+        DCHECK(i.InputFloat32(1) == 0.0f);
+        __ VFPCompareAndSetFlags(i.InputFloat32Register(0), i.InputFloat32(1));
       }
       DCHECK_EQ(SetCC, i.OutputSBit());
       break;
     case kArmVaddF32:
       __ vadd(i.OutputFloat32Register(), i.InputFloat32Register(0),
               i.InputFloat32Register(1));
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     case kArmVsubF32:
       __ vsub(i.OutputFloat32Register(), i.InputFloat32Register(0),
@@ skipping 674 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8