[turbofan] Add backend support for float32.

src/compiler/arm64/code-generator-arm64.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/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 358 matching lines @@
       DCHECK(d1.is(i.InputDoubleRegister(1)));
       DCHECK(d0.is(i.OutputDoubleRegister()));
       // TODO(dcarney): make sure this saves all relevant registers.
       __ CallCFunction(ExternalReference::mod_two_doubles_operation(isolate()),
                        0, 2);
       break;
     }
     case kArm64Float64Sqrt:
       __ Fsqrt(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
+    case kArm64Float32ToFloat64:
+      __ Fcvt(i.OutputDoubleRegister(), i.InputDoubleRegister(0).S());
+      break;
+    case kArm64Float64ToFloat32:
+      __ Fcvt(i.OutputDoubleRegister().S(), i.InputDoubleRegister(0));
+      break;
     case kArm64Float64ToInt32:
       __ Fcvtzs(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Float64ToUint32:
       __ Fcvtzu(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;
     case kArm64Int32ToFloat64:
       __ Scvtf(i.OutputDoubleRegister(), i.InputRegister32(0));
       break;
     case kArm64Uint32ToFloat64:
@@ skipping 22 matching lines @@
       break;
     case kArm64StrW:
       __ Str(i.InputRegister32(2), i.MemoryOperand());
       break;
     case kArm64Ldr:
       __ Ldr(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Str:
       __ Str(i.InputRegister(2), i.MemoryOperand());
       break;
-    case kArm64LdrS: {
-      UseScratchRegisterScope scope(masm());
-      FPRegister scratch = scope.AcquireS();
-      __ Ldr(scratch, i.MemoryOperand());
-      __ Fcvt(i.OutputDoubleRegister(), scratch);
+    case kArm64LdrS:
+      __ Ldr(i.OutputDoubleRegister().S(), i.MemoryOperand());
       break;
-    }
-    case kArm64StrS: {
-      UseScratchRegisterScope scope(masm());
-      FPRegister scratch = scope.AcquireS();
-      __ Fcvt(scratch, i.InputDoubleRegister(2));
-      __ Str(scratch, i.MemoryOperand());
+    case kArm64StrS:
+      __ Str(i.InputDoubleRegister(2).S(), i.MemoryOperand());
       break;
-    }
     case kArm64LdrD:
       __ Ldr(i.OutputDoubleRegister(), i.MemoryOperand());
       break;
     case kArm64StrD:
       __ Str(i.InputDoubleRegister(2), i.MemoryOperand());
       break;
     case kArm64StoreWriteBarrier: {
       Register object = i.InputRegister(0);
       Register index = i.InputRegister(1);
       Register value = i.InputRegister(2);
@@ skipping 425 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8