[arm] BitcastF32U32 uses float registers.

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2050563002
Cr-Commit-Position: refs/heads/master@{#37017}

src/compiler/arm/code-generator-arm.cc

@@ -1145,6 +1145,10 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       __ vmov(i.OutputRegister(), i.InputFloat32Register(0));
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
+    case kArmVmovF32U32:
+      __ vmov(i.OutputFloat32Register(), i.InputRegister(0));
+      DCHECK_EQ(LeaveCC, i.OutputSBit());
+      break;
     case kArmVmovLowU32F64:
       __ VmovLow(i.OutputRegister(), i.InputFloat64Register(0));
       DCHECK_EQ(LeaveCC, i.OutputSBit());

src/compiler/arm/instruction-codes-arm.h

@@ -93,6 +93,7 @@ namespace compiler {
   V(ArmVcvtS32F64)                 \
   V(ArmVcvtU32F64)                 \
   V(ArmVmovU32F32)                 \
+  V(ArmVmovF32U32)                 \
   V(ArmVmovLowU32F64)              \
   V(ArmVmovLowF64U32)              \
   V(ArmVmovHighU32F64)             \

src/compiler/arm/instruction-scheduler-arm.cc

@@ -95,6 +95,7 @@ int InstructionScheduler::GetTargetInstructionFlags(
     case kArmVcvtS32F64:
     case kArmVcvtU32F64:
     case kArmVmovU32F32:
+    case kArmVmovF32U32:
     case kArmVmovLowU32F64:
     case kArmVmovLowF64U32:
     case kArmVmovHighU32F64:

src/compiler/arm/instruction-selector-arm.cc

@@ -1211,20 +1211,14 @@ void InstructionSelector::VisitRoundFloat64ToInt32(Node* node) {
   VisitRR(this, kArmVcvtS32F64, node);
 }
 
-
 void InstructionSelector::VisitBitcastFloat32ToInt32(Node* node) {
   VisitRR(this, kArmVmovU32F32, node);
 }
 
-
 void InstructionSelector::VisitBitcastInt32ToFloat32(Node* node) {
-  ArmOperandGenerator g(this);
-  Emit(kArmVmovLowF64U32, g.DefineAsRegister(node),
-       ImmediateOperand(ImmediateOperand::INLINE, 0),
-       g.UseRegister(node->InputAt(0)));
+  VisitRR(this, kArmVmovF32U32, node);
 }
 
-
 void InstructionSelector::VisitFloat32Add(Node* node) {
   ArmOperandGenerator g(this);
   Float32BinopMatcher m(node);