MIPS: Never hchange nan-hole to hole or hole to nan-hole. Only allow changing hole to nan if all us…

src/mips/macro-assembler-mips.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 217 matching lines @@
     if (!dst.is(src)) {
       mov_d(dst, src);
     }
   }
 
   inline void Move(Register dst_low, Register dst_high, FPURegister src) {
     mfc1(dst_low, src);
     mfc1(dst_high, FPURegister::from_code(src.code() + 1));
   }
 
+  inline void MoveHigh(Register dst_high, FPURegister src) {

[Paul Lind, 2013/08/14 22:48:39]

I think we should rename these FmoveHigh/FmoveLow, to clearly indicate the FPU
functionality.

[palfia, 2013/08/14 23:05:44]

Done.

+    mfc1(dst_high, FPURegister::from_code(src.code() + 1));
+  }
+
+  inline void MoveLow(Register dst_low, FPURegister src) {
+    mfc1(dst_low, src);
+  }
+
   inline void Move(FPURegister dst, Register src_low, Register src_high) {
     mtc1(src_low, dst);
     mtc1(src_high, FPURegister::from_code(dst.code() + 1));
   }
 
   // Conditional move.
   void Move(FPURegister dst, double imm);
   void Movz(Register rd, Register rs, Register rt);
   void Movn(Register rd, Register rs, Register rt);
   void Movt(Register rd, Register rs, uint16_t cc = 0);
@@ skipping 1325 matching lines @@
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_