[turbofan] Add backend support for Float32Constant.

src/compiler/x64/code-generator-x64.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 57 matching lines @@
   Immediate64 ToImmediate64(InstructionOperand* operand) {
     Constant constant = ToConstant(operand);
     Immediate64 immediate;
     immediate.value = 0xbeefdeaddeefbeed;
     immediate.type = kImm64Value;
     switch (constant.type()) {
       case Constant::kInt32:
       case Constant::kInt64:
         immediate.value = constant.ToInt64();
         return immediate;
+      case Constant::kFloat32:
+        immediate.type = kImm64Handle;
+        immediate.handle =
+            isolate()->factory()->NewNumber(constant.ToFloat32(), TENURED);
+        return immediate;
       case Constant::kFloat64:
         immediate.type = kImm64Handle;
         immediate.handle =
             isolate()->factory()->NewNumber(constant.ToFloat64(), TENURED);
         return immediate;
       case Constant::kExternalReference:
         immediate.type = kImm64Reference;
         immediate.reference = constant.ToExternalReference();
         return immediate;
       case Constant::kHeapObject:
         immediate.type = kImm64Handle;
         immediate.handle = constant.ToHeapObject();
         return immediate;
     }
     UNREACHABLE();
     return immediate;
   }
 
   Immediate ToImmediate(InstructionOperand* operand) {
     Constant constant = ToConstant(operand);
     switch (constant.type()) {
       case Constant::kInt32:
         return Immediate(constant.ToInt32());
       case Constant::kInt64:
+      case Constant::kFloat32:
       case Constant::kFloat64:
       case Constant::kExternalReference:
       case Constant::kHeapObject:
         break;
     }
     UNREACHABLE();
     return Immediate(-1);
   }
 
   Operand ToOperand(InstructionOperand* op, int extra = 0) {
@@ skipping 782 matching lines @@
     } else {
       // Spill on demand to use a temporary register for memory-to-memory
       // moves.
       Register tmp = kScratchRegister;
       Operand dst = g.ToOperand(destination);
       __ movq(tmp, src);
       __ movq(dst, tmp);
     }
   } else if (source->IsConstant()) {
     ConstantOperand* constant_source = ConstantOperand::cast(source);
+    Constant src = g.ToConstant(constant_source);
     if (destination->IsRegister() || destination->IsStackSlot()) {
       Register dst = destination->IsRegister() ? g.ToRegister(destination)
                                                : kScratchRegister;
       Immediate64 imm = g.ToImmediate64(constant_source);
       switch (imm.type) {
         case kImm64Value:
           __ Set(dst, imm.value);
           break;
         case kImm64Reference:
           __ Move(dst, imm.reference);
           break;
         case kImm64Handle:
           __ Move(dst, imm.handle);
           break;
       }
       if (destination->IsStackSlot()) {
         __ movq(g.ToOperand(destination), kScratchRegister);
       }
+    } else if (src.type() == Constant::kFloat32) {
+      // TODO(turbofan): Can we do better here?
+      __ movl(kScratchRegister, Immediate(bit_cast<int32_t>(src.ToFloat32())));
+      if (destination->IsDoubleRegister()) {
+        XMMRegister dst = g.ToDoubleRegister(destination);
+        __ movq(dst, kScratchRegister);
+      } else {
+        DCHECK(destination->IsDoubleStackSlot());
+        Operand dst = g.ToOperand(destination);
+        __ movl(dst, kScratchRegister);
+      }
     } else {
-      __ movq(kScratchRegister,
-              bit_cast<uint64_t, double>(g.ToDouble(constant_source)));
+      DCHECK_EQ(Constant::kFloat64, src.type());
+      __ movq(kScratchRegister, bit_cast<int64_t>(src.ToFloat64()));
       if (destination->IsDoubleRegister()) {
         __ movq(g.ToDoubleRegister(destination), kScratchRegister);
       } else {
         DCHECK(destination->IsDoubleStackSlot());
         __ movq(g.ToOperand(destination), kScratchRegister);
       }
     }
   } else if (source->IsDoubleRegister()) {
     XMMRegister src = g.ToDoubleRegister(source);
     if (destination->IsDoubleRegister()) {
@@ skipping 82 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace compiler
 }  // namespace v8