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

src/mips/macro-assembler-mips.cc

 // Copyright 2012 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 <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
@@ skipping 1531 matching lines @@
       }
     }
   }
 
   if (bd == PROTECT) {
     nop();
   }
 }
 
 
+void MacroAssembler::FmoveLow(FPURegister dst, Register src_low) {
+  if (IsFp64Mode()) {
+    DCHECK(!src_low.is(at));
+    mfhc1(at, dst);
+    mtc1(src_low, dst);
+    mthc1(at, dst);
+  } else {
+    mtc1(src_low, dst);
+  }
+}
+
+
 void MacroAssembler::Move(FPURegister dst, float imm) {
   li(at, Operand(bit_cast<int32_t>(imm)));
   mtc1(at, dst);
 }
 
 
 void MacroAssembler::Move(FPURegister dst, double imm) {
   static const DoubleRepresentation minus_zero(-0.0);
   static const DoubleRepresentation zero(0.0);
   DoubleRepresentation value_rep(imm);
@@ skipping 4514 matching lines @@
   }
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS