[turbofan] Add backend support for Float32Constant.

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 41 matching lines @@
   Operand HighOperand(InstructionOperand* op) {
     DCHECK(op->IsDoubleStackSlot());
     return ToOperand(op, kPointerSize);
   }
 
   Immediate ToImmediate(InstructionOperand* operand) {
     Constant constant = ToConstant(operand);
     switch (constant.type()) {
       case Constant::kInt32:
         return Immediate(constant.ToInt32());
+      case Constant::kFloat32:
+        return Immediate(
+            isolate()->factory()->NewNumber(constant.ToFloat32(), TENURED));
       case Constant::kFloat64:
         return Immediate(
             isolate()->factory()->NewNumber(constant.ToFloat64(), TENURED));
       case Constant::kExternalReference:
         return Immediate(constant.ToExternalReference());
       case Constant::kHeapObject:
         return Immediate(constant.ToHeapObject());
       case Constant::kInt64:
         break;
     }
@@ skipping 760 matching lines @@
         } else {
           __ mov(dst, src);
         }
       }
     } else if (destination->IsRegister()) {
       Register dst = g.ToRegister(destination);
       __ mov(dst, g.ToImmediate(source));
     } else if (destination->IsStackSlot()) {
       Operand dst = g.ToOperand(destination);
       __ mov(dst, g.ToImmediate(source));
+    } else if (src_constant.type() == Constant::kFloat32) {
+      // TODO(turbofan): Can we do better here?
+      Immediate src(bit_cast<int32_t>(src_constant.ToFloat32()));
+      if (destination->IsDoubleRegister()) {
+        XMMRegister dst = g.ToDoubleRegister(destination);
+        __ push(Immediate(src));
+        __ movss(dst, Operand(esp, 0));
+        __ add(esp, Immediate(kDoubleSize / 2));
+      } else {
+        DCHECK(destination->IsDoubleStackSlot());
+        Operand dst = g.ToOperand(destination);
+        __ mov(dst, src);
+      }
     } else {
-      double v = g.ToDouble(source);
+      DCHECK_EQ(Constant::kFloat64, src_constant.type());
+      double v = src_constant.ToFloat64();
       uint64_t int_val = bit_cast<uint64_t, double>(v);
       int32_t lower = static_cast<int32_t>(int_val);
       int32_t upper = static_cast<int32_t>(int_val >> kBitsPerInt);
       if (destination->IsDoubleRegister()) {
         XMMRegister dst = g.ToDoubleRegister(destination);
         __ Move(dst, v);
       } else {
         DCHECK(destination->IsDoubleStackSlot());
         Operand dst0 = g.ToOperand(destination);
         Operand dst1 = g.HighOperand(destination);
@@ skipping 100 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8