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Improved div RAX:RDX vreg expression preservation

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This commit is contained in:
Brian Fiete 2021-09-22 08:05:45 -07:00
parent 7ef88f4b9c
commit c0d6db0824
1 changed files with 57 additions and 1 deletions
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58
IDEHelper/Backend/BeMCContext.cpp
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@ -9883,6 +9883,62 @@ bool BeMCContext::DoLegalization()
auto arg0Type = GetType(arg0);
if (arg0Type->IsInt())
{
// We can't allow division by RDX because we need RAX:RDX for the dividend
bool needRegDisable = false;
std::function<void(BeMCOperand)> _CheckReg = [&](BeMCOperand operand)
{
if (!operand)
return;
if (operand.mKind == BeMCOperandKind_NativeReg)
{
auto divisorReg = GetFullRegister(operand.mReg);
if ((divisorReg == X64Reg_RDX) || (divisorReg == X64Reg_RAX))
needRegDisable = true;
}
auto vregInfo = GetVRegInfo(operand);
if (vregInfo != NULL)
{
auto divisorReg = GetFullRegister(vregInfo->mReg);
if ((divisorReg == X64Reg_RDX) || (divisorReg == X64Reg_RAX))
needRegDisable = true;
_CheckReg(vregInfo->mRelTo);
_CheckReg(vregInfo->mRelOffset);
if ((needRegDisable) &&
((!vregInfo->mDisableRAX) || (!vregInfo->mDisableRDX)))
{
if (mDebugging)
{
NOP;
}
vregInfo->mDisableRAX = true;
vregInfo->mDisableRDX = true;
isFinalRun = false;
if (debugging)
OutputDebugStrF(" Div/Rem invalid reg\n");
}
}
};
needRegDisable = false;
_CheckReg(arg1);
if ((instIdx > 0) && (regPreserveDepth > 0))
{
auto prevInst = mcBlock->mInstructions[instIdx - 1];
if (prevInst->mKind == BeMCInstKind_Mov)
{
// Check replaced 'mov' (which is inside PreserveVolatile sections)
needRegDisable = false;
_CheckReg(prevInst->mArg1);
}
}
///
auto checkArg1 = arg1;
if (checkArg1.mKind == BeMCOperandKind_VRegLoad)
{
@ -15855,7 +15911,7 @@ void BeMCContext::Generate(BeFunction* function)
mDbgPreferredRegs[32] = X64Reg_R8;*/
//mDbgPreferredRegs[8] = X64Reg_RAX;
//mDebugging = (function->mName == "?Negate__im@TimeSpan@System@bf@@SA?AU?$Result@VTimeSpan@System@bf@@@23@_J@Z");
//mDebugging = (function->mName == "?DrawCard@Stats@NecroCard@bf@@QEAAX_N@Z");
// || (function->mName == "?MethodA@TestProgram@BeefTest@bf@@CAXXZ");
// || (function->mName == "?Hey@Blurg@bf@@SAXXZ")
// ;