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arm64: Only clobber HI and LO together.

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We can't clobber LO if HI is still needed.  Fixes a crash in Trails in
the Sky on new game (due to a mfhi getting the wrong result.)
This commit is contained in:
Unknown W. Brackets 2015-10-17 01:20:04 -07:00
parent 6c31612b1d
commit 387ebf3ddd
1 changed files with 9 additions and 2 deletions
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11
Core/MIPS/ARM64/Arm64RegCache.cpp
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@ -236,8 +236,15 @@ ARM64Reg Arm64RegCache::FindBestToSpill(bool unusedOnly, bool *clobbered) {
// Awesome, a clobbered reg. Let's use it.
if (MIPSAnalyst::IsRegisterClobbered(ar[reg].mipsReg, compilerPC_, UNUSED_LOOKAHEAD_OPS)) {
*clobbered = true;
return reg;
bool canClobber = true;
// HI is stored inside the LO reg. They both have to clobber at the same time.
if (ar[reg].mipsReg == MIPS_REG_LO) {
canClobber = MIPSAnalyst::IsRegisterClobbered(MIPS_REG_HI, compilerPC_, UNUSED_LOOKAHEAD_OPS);
}
if (canClobber) {
*clobbered = true;
return reg;
}
}
// Not awesome. A used reg. Let's try to avoid spilling.