MIPS: [turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

src/compiler/mips/code-generator-mips.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/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/mips/macro-assembler-mips.h"
 #include "src/scopes.h"
@@ skipping 603 matching lines @@
       __ trunc_w_d(scratch, i.InputDoubleRegister(0));
       __ mfc1(i.OutputRegister(), scratch);
       break;
     }
     case kMipsTruncUwD: {
       FPURegister scratch = kScratchDoubleReg;
       // TODO(plind): Fix wrong param order of Trunc_uw_d() macro-asm function.
       __ Trunc_uw_d(i.InputDoubleRegister(0), i.OutputRegister(), scratch);
       break;
     }
+    case kMipsFmoveLowUwD:
+      __ FmoveLow(i.OutputRegister(), i.InputDoubleRegister(0));
+      break;
+    case kMipsFmoveLowDUw:
+      if (CpuFeatures::IsSupported(FP64FPU)) {

[dusmil.imgtec, 2015/03/05 14:58:21]

The selection is not good, you forced runtime checks.
Use macro version for moves which hides fpu mode selection.

[balazs.kilvady, 2015/03/05 17:25:55]

Done.

+        __ mfhc1(at, i.OutputDoubleRegister());
+      }
+      __ FmoveLow(i.OutputDoubleRegister(), i.InputRegister(1));
+      if (CpuFeatures::IsSupported(FP64FPU)) {
+        __ mthc1(at, i.OutputDoubleRegister());
+      }
+      break;
+    case kMipsFmoveHighUwD:
+      __ FmoveHigh(i.OutputRegister(), i.InputDoubleRegister(0));
+      break;
+    case kMipsFmoveHighDUw:
+      __ FmoveHigh(i.OutputDoubleRegister(), i.InputRegister(1));
+      break;
     // ... more basic instructions ...
 
     case kMipsLbu:
       __ lbu(i.OutputRegister(), i.MemoryOperand());
       break;
     case kMipsLb:
       __ lb(i.OutputRegister(), i.MemoryOperand());
       break;
     case kMipsSb:
       __ sb(i.InputRegister(2), i.MemoryOperand());
@@ skipping 571 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8