[turbofan] Add backend support for Float32Constant.

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

 // Copyright 2014 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/arm/macro-assembler-arm.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 50 matching lines @@
     }
     UNREACHABLE();
     return LeaveCC;
   }
 
   Operand InputImmediate(int index) {
     Constant constant = ToConstant(instr_->InputAt(index));
     switch (constant.type()) {
       case Constant::kInt32:
         return Operand(constant.ToInt32());
+      case Constant::kFloat32:
+        return Operand(
+            isolate()->factory()->NewNumber(constant.ToFloat32(), TENURED));
       case Constant::kFloat64:
         return Operand(
             isolate()->factory()->NewNumber(constant.ToFloat64(), TENURED));
       case Constant::kInt64:
       case Constant::kExternalReference:
       case Constant::kHeapObject:
         break;
     }
     UNREACHABLE();
     return Operand::Zero();
@@ skipping 662 matching lines @@
     DCHECK(destination->IsRegister() || destination->IsStackSlot());
     MemOperand src = g.ToMemOperand(source);
     if (destination->IsRegister()) {
       __ ldr(g.ToRegister(destination), src);
     } else {
       Register temp = kScratchReg;
       __ ldr(temp, src);
       __ str(temp, g.ToMemOperand(destination));
     }
   } else if (source->IsConstant()) {
+    Constant src = g.ToConstant(source);
     if (destination->IsRegister() || destination->IsStackSlot()) {
       Register dst =
           destination->IsRegister() ? g.ToRegister(destination) : kScratchReg;
-      Constant src = g.ToConstant(source);
       switch (src.type()) {
         case Constant::kInt32:
           __ mov(dst, Operand(src.ToInt32()));
           break;
         case Constant::kInt64:
           UNREACHABLE();
           break;
+        case Constant::kFloat32:
+          __ Move(dst,
+                  isolate()->factory()->NewNumber(src.ToFloat32(), TENURED));
+          break;
         case Constant::kFloat64:
           __ Move(dst,
                   isolate()->factory()->NewNumber(src.ToFloat64(), TENURED));
           break;
         case Constant::kExternalReference:
           __ mov(dst, Operand(src.ToExternalReference()));
           break;
         case Constant::kHeapObject:
           __ Move(dst, src.ToHeapObject());
           break;
       }
       if (destination->IsStackSlot()) __ str(dst, g.ToMemOperand(destination));
-    } else if (destination->IsDoubleRegister()) {
-      DwVfpRegister result = g.ToDoubleRegister(destination);
-      __ vmov(result, g.ToDouble(source));
+    } else if (src.type() == Constant::kFloat32) {
+      SwVfpRegister dst = destination->IsDoubleRegister()
+                              ? g.ToFloat32Register(destination)
+                              : kScratchDoubleReg.low();
+      // TODO(turbofan): Can we do better here?
+      __ mov(ip, Operand(bit_cast<int32_t>(src.ToFloat32())));
+      __ vmov(dst, ip);
+      if (destination->IsDoubleStackSlot()) {
+        __ vstr(dst, g.ToMemOperand(destination));
+      }
     } else {
-      DCHECK(destination->IsDoubleStackSlot());
-      DwVfpRegister temp = kScratchDoubleReg;
-      __ vmov(temp, g.ToDouble(source));
-      __ vstr(temp, g.ToMemOperand(destination));
+      DCHECK_EQ(Constant::kFloat64, src.type());
+      DwVfpRegister dst = destination->IsDoubleRegister()
+                              ? g.ToFloat64Register(destination)
+                              : kScratchDoubleReg;
+      __ vmov(dst, src.ToFloat64());
+      if (destination->IsDoubleStackSlot()) {
+        __ vstr(dst, g.ToMemOperand(destination));
+      }
     }
   } else if (source->IsDoubleRegister()) {
     DwVfpRegister src = g.ToDoubleRegister(source);
     if (destination->IsDoubleRegister()) {
       DwVfpRegister dst = g.ToDoubleRegister(destination);
       __ Move(dst, src);
     } else {
       DCHECK(destination->IsDoubleStackSlot());
       __ vstr(src, g.ToMemOperand(destination));
     }
@@ skipping 103 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8