MIPS: Fixing illegal use of at register

src/mips64/assembler-mips64.cc

Index: src/mips64/assembler-mips64.cc
diff --git a/src/mips64/assembler-mips64.cc b/src/mips64/assembler-mips64.cc
index 98dd71122ad9c8ae7f24d051480f7bb3e0efe385..e91e4333bd7df011ca336c58a22478b6c56ccc1b 100644
--- a/src/mips64/assembler-mips64.cc
+++ b/src/mips64/assembler-mips64.cc
@@ -2376,6 +2376,7 @@ void Assembler::lwc1(FPURegister fd, const MemOperand& src) {
 
 
 void Assembler::ldc1(FPURegister fd, const MemOperand& src) {
+  CHECK(!src.rm().is(at));

[paul.l..., 2015/08/31 22:56:34]

DCHECK() here and below.

[Djordje.Pesic, 2015/09/07 11:34:17]

Done.

   if (is_int16(src.offset_)) {
     GenInstrImmediate(LDC1, src.rm(), fd, src.offset_);
   } else {  // Offset > 16 bits, use multiple instructions to load.
@@ -2396,6 +2397,7 @@ void Assembler::swc1(FPURegister fd, const MemOperand& src) {
 
 
 void Assembler::sdc1(FPURegister fd, const MemOperand& src) {
+  CHECK(!src.rm().is(at));
   if (is_int16(src.offset_)) {
     GenInstrImmediate(SDC1, src.rm(), fd, src.offset_);
   } else {  // Offset > 16 bits, use multiple instructions to load.