[Turbofan] CodeGenerator for ARM avoids moves from VFP to general regs.

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/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 1880 matching lines @@
         DCHECK(destination->IsDoubleStackSlot());
         __ vstr(src, g.ToMemOperand(destination));
       }
     } else {
       DCHECK_EQ(MachineRepresentation::kFloat32, rep);
       // GapResolver may give us reg codes that don't map to actual s-registers.
       // Generate code to work around those cases.
       int src_code = LocationOperand::cast(source)->register_code();
       if (destination->IsFloatRegister()) {
         int dst_code = LocationOperand::cast(destination)->register_code();
-        __ VmovExtended(dst_code, src_code, kScratchReg);
+        __ VmovExtended(dst_code, src_code);
       } else {
         DCHECK(destination->IsFloatStackSlot());
-        __ VmovExtended(g.ToMemOperand(destination), src_code, kScratchReg);
+        __ VmovExtended(g.ToMemOperand(destination), src_code);
       }
     }
   } else if (source->IsFPStackSlot()) {
     MemOperand src = g.ToMemOperand(source);
     MachineRepresentation rep =
         LocationOperand::cast(destination)->representation();
     if (destination->IsFPRegister()) {
       if (rep == MachineRepresentation::kFloat64) {
         __ vldr(g.ToDoubleRegister(destination), src);
       } else {
         DCHECK_EQ(MachineRepresentation::kFloat32, rep);
         // GapResolver may give us reg codes that don't map to actual
         // s-registers. Generate code to work around those cases.
         int dst_code = LocationOperand::cast(destination)->register_code();
-        __ VmovExtended(dst_code, src, kScratchReg);
+        __ VmovExtended(dst_code, src);
       }
     } else {
       DCHECK(destination->IsFPStackSlot());
       if (rep == MachineRepresentation::kFloat64) {
         DwVfpRegister temp = kScratchDoubleReg;
         __ vldr(temp, src);
         __ vstr(temp, g.ToMemOperand(destination));
       } else {
         DCHECK_EQ(MachineRepresentation::kFloat32, rep);
         SwVfpRegister temp = kScratchDoubleReg.low();
@@ skipping 51 matching lines @@
         MemOperand dst = g.ToMemOperand(destination);
         __ Move(temp, src);
         __ vldr(src, dst);
         __ vstr(temp, dst);
       }
     } else {
       DCHECK_EQ(MachineRepresentation::kFloat32, rep);
       int src_code = LocationOperand::cast(source)->register_code();
       if (destination->IsFPRegister()) {
         int dst_code = LocationOperand::cast(destination)->register_code();
-        __ VmovExtended(temp.low().code(), src_code, kScratchReg);
-        __ VmovExtended(src_code, dst_code, kScratchReg);
-        __ VmovExtended(dst_code, temp.low().code(), kScratchReg);
+        __ VswpExtended(dst_code, src_code);
       } else {
         DCHECK(destination->IsFPStackSlot());
         MemOperand dst = g.ToMemOperand(destination);
-        __ VmovExtended(temp.low().code(), src_code, kScratchReg);
-        __ VmovExtended(src_code, dst, kScratchReg);
-        __ vstr(temp.low(), dst);
+        __ VswpExtended(dst, src_code);
       }
     }
   } else if (source->IsFPStackSlot()) {
     DCHECK(destination->IsFPStackSlot());
     Register temp_0 = kScratchReg;
     LowDwVfpRegister temp_1 = kScratchDoubleReg;
     MemOperand src0 = g.ToMemOperand(source);
     MemOperand dst0 = g.ToMemOperand(destination);
     MachineRepresentation rep = LocationOperand::cast(source)->representation();
     if (rep == MachineRepresentation::kFloat64) {
@@ skipping 43 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8