[turbofan] Add backend support for load/store float32 values.

src/compiler/ia32/code-generator-ia32.cc

 // Copyright 2013 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/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 371 matching lines @@
       break;
     case kIA32Movsd:
       if (instr->HasOutput()) {
         __ movsd(i.OutputDoubleRegister(), i.MemoryOperand());
       } else {
         int index = 0;
         Operand operand = i.MemoryOperand(&index);
         __ movsd(operand, i.InputDoubleRegister(index));
       }
       break;
+    case kIA32Movss:
+      if (instr->HasOutput()) {
+        __ movss(i.OutputDoubleRegister(), i.MemoryOperand());
+        __ cvtss2sd(i.OutputDoubleRegister(), i.OutputDoubleRegister());
+      } else {
+        int index = 0;
+        Operand operand = i.MemoryOperand(&index);
+        __ cvtsd2ss(xmm0, i.InputDoubleRegister(index));
+        __ movss(operand, xmm0);
+      }
+      break;
     case kIA32StoreWriteBarrier: {
       Register object = i.InputRegister(0);
       Register index = i.InputRegister(1);
       Register value = i.InputRegister(2);
       __ mov(Operand(object, index, times_1, 0), value);
       __ lea(index, Operand(object, index, times_1, 0));
       SaveFPRegsMode mode = code_->frame()->DidAllocateDoubleRegisters()
                                 ? kSaveFPRegs
                                 : kDontSaveFPRegs;
       __ RecordWrite(object, index, value, mode);
@@ skipping 536 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { __ nop(); }
 
 #undef __
 
 }
 }
 }  // namespace v8::internal::compiler