[ia32] Better code generation for materialization of float/double constants.

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 887 matching lines @@
         }
       }
     } 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()));
+      uint32_t src = bit_cast<uint32_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));
+        __ Move(dst, src);
       } else {
         DCHECK(destination->IsDoubleStackSlot());
         Operand dst = g.ToOperand(destination);
-        __ mov(dst, src);
+        __ mov(dst, Immediate(src));
       }
     } else {
       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);
+      uint64_t src = bit_cast<uint64_t>(src_constant.ToFloat64());
+      uint32_t lower = static_cast<uint32_t>(src);
+      uint32_t upper = static_cast<uint32_t>(src >> 32);
       if (destination->IsDoubleRegister()) {
         XMMRegister dst = g.ToDoubleRegister(destination);
-        __ Move(dst, v);
+        __ Move(dst, src);
       } else {
         DCHECK(destination->IsDoubleStackSlot());
         Operand dst0 = g.ToOperand(destination);
         Operand dst1 = g.HighOperand(destination);
         __ mov(dst0, Immediate(lower));
         __ mov(dst1, Immediate(upper));
       }
     }
   } else if (source->IsDoubleRegister()) {
     XMMRegister src = g.ToDoubleRegister(source);
@@ skipping 94 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8