[turbofan] Add backend support for float32.

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 267 matching lines @@
       __ fnstsw_ax();
       __ sahf();
       __ j(parity_even, &mod_loop);
       // Move output to stack and clean up.
       __ fstp(1);
       __ fstp_d(Operand(esp, 0));
       __ movsd(i.OutputDoubleRegister(), Operand(esp, 0));
       __ add(esp, Immediate(kDoubleSize));
       break;
     }
+    case kCvtss2sd:
+      __ cvtss2sd(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
+    case kCvtsd2ss:
+      __ cvtsd2ss(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kSSEFloat64ToInt32:
       __ cvttsd2si(i.OutputRegister(), i.InputOperand(0));
       break;
     case kSSEFloat64ToUint32: {
       XMMRegister scratch = xmm0;
       __ Move(scratch, -2147483648.0);
       __ addsd(scratch, i.InputOperand(0));
       __ cvttsd2si(i.OutputRegister(), scratch);
       __ add(i.OutputRegister(), Immediate(0x80000000));
       break;
@@ skipping 55 matching lines @@
         __ 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);
+        __ movss(operand, i.InputDoubleRegister(index));
       }
       break;
     case kIA32Push:
       if (HasImmediateInput(instr, 0)) {
         __ push(i.InputImmediate(0));
       } else {
         __ push(i.InputOperand(0));
       }
       break;
     case kIA32StoreWriteBarrier: {
@@ skipping 568 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8