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Improved RAX/RDX preservation in IDIV section

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This commit is contained in:
Brian Fiete 2022-04-29 07:01:07 -07:00
parent 9860ef1cb3
commit ae6287a466
1 changed files with 14 additions and 8 deletions
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14
IDEHelper/Backend/BeMCContext.cpp
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@ -9026,6 +9026,11 @@ bool BeMCContext::DoLegalization()
newOperand.mVRegIdx = scratchReg.mVRegIdx;
IntroduceVRegs(scratchReg, mcBlock, insertPos, insertPos + 1);
auto scratchVRegInfo = mVRegInfo[scratchReg.mVRegIdx];
// If a scratch vreg needs to preserve a register like the remapped vreg
scratchVRegInfo->mDisableRAX |= remappedVRegInfo->mDisableRAX;
scratchVRegInfo->mDisableRDX |= remappedVRegInfo->mDisableRDX;
if ((insertPos == instIdx) || (!scratchForceReg))
{
// Only allow short-lived forceRegs
@ -10094,14 +10099,10 @@ bool BeMCContext::DoLegalization()
mcRemaindier = BeMCOperand::FromReg(ResizeRegister(X64Reg_RDX, arg0Type));
preserveRDXInst->mArg1 = inst->mArg0; // RDX preserve elision exception
auto vregInfo = GetVRegInfo(inst->mArg0);
if (vregInfo != NULL)
{
// This is to avoid overlap with PreserveRAX
DisableRegister(inst->mArg0, X64Reg_RAX);
if (preserveRDX)
DisableRegister(inst->mArg0, X64Reg_RDX);
}
AllocInst(BeMCInstKind_Mov, inst->mArg0, mcRemaindier, instIdx++ + 1);
}
}
@ -10109,6 +10110,11 @@ bool BeMCContext::DoLegalization()
{
preserveRAXInst->mArg1 = inst->mArg0; // RAX preserve elision exception
AllocInst(BeMCInstKind_Mov, inst->mArg0, mcScratch, instIdx++ + 1);
// This is to avoid overlap with PreserveRAX
DisableRegister(inst->mArg0, X64Reg_RAX);
if (preserveRDX)
DisableRegister(inst->mArg0, X64Reg_RDX);
}
inst->mArg0 = mcScratch;
if (preserveRDX)