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-rw-r--r--js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp10
1 files changed, 8 insertions, 2 deletions
diff --git a/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp b/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp
index 38897de0d..839664b8c 100644
--- a/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp
+++ b/js/src/jit/mips-shared/MacroAssembler-mips-shared.cpp
@@ -236,8 +236,14 @@ template <typename L>
void
MacroAssemblerMIPSShared::ma_addTestCarry(Register rd, Register rs, Register rt, L overflow)
{
- as_addu(rd, rs, rt);
- as_sltu(SecondScratchReg, rd, rs);
+ if (rd != rs) {
+ as_addu(rd, rs, rt);
+ as_sltu(SecondScratchReg, rd, rs);
+ } else {
+ ma_move(SecondScratchReg, rs);
+ as_addu(rd, rs, rt);
+ as_sltu(SecondScratchReg, rd, SecondScratchReg);
+ }
ma_b(SecondScratchReg, SecondScratchReg, overflow, Assembler::NonZero);
}