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Avoid 'AH' instruction encoding issue

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This commit is contained in:
Brian Fiete 2022-02-16 06:59:11 -05:00
parent 1b217e96aa
commit c9afcf3360
1 changed files with 8 additions and 5 deletions
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13
IDEHelper/Backend/BeMCContext.cpp
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@ -10054,9 +10054,11 @@ bool BeMCContext::DoLegalization()
BeMCOperand mcRemaindier;
if (arg0Type->mSize == 1)
{
mcRemaindier = BeMCOperand::FromReg(ResizeRegister(X64Reg_AH, arg0Type));
mcRemaindier = BeMCOperand::FromReg(ResizeRegister(X64Reg_AL, arg0Type));
preserveRAXInst->mArg1 = inst->mArg0; // RAX preserve elision exception
DisableRegister(inst->mArg0, X64Reg_SIL); // Disable Hi8
DisableRegister(inst->mArg0, X64Reg_SIL); // Disable Hi8
AllocInst(BeMCInstKind_Shr, BeMCOperand::FromReg(X64Reg_AX), BeMCOperand::FromImmediate(8), instIdx++ + 1);
AllocInst(BeMCInstKind_Mov, inst->mArg0, mcRemaindier, instIdx++ + 1);
}
else
{
@ -10071,8 +10073,8 @@ bool BeMCContext::DoLegalization()
if (preserveRDX)
DisableRegister(inst->mArg0, X64Reg_RDX);
}
}
AllocInst(BeMCInstKind_Mov, inst->mArg0, mcRemaindier, instIdx++ + 1);
AllocInst(BeMCInstKind_Mov, inst->mArg0, mcRemaindier, instIdx++ + 1);
}
}
else
{
@ -10138,7 +10140,8 @@ bool BeMCContext::DoLegalization()
DisableRegister(inst->mArg0, X64Reg_RAX);
DisableRegister(inst->mArg1, X64Reg_RAX);
AllocInst(BeMCInstKind_Mov, BeMCOperand::FromReg(X64Reg_AH), inst->mArg1, instIdx++);
AllocInst(BeMCInstKind_Mov, BeMCOperand::FromReg(X64Reg_AL), inst->mArg1, instIdx++);
AllocInst(BeMCInstKind_Shl, BeMCOperand::FromReg(X64Reg_AX), BeMCOperand::FromImmediate(8), instIdx++);
AllocInst(BeMCInstKind_Mov, BeMCOperand::FromReg(X64Reg_AL), inst->mArg0, instIdx++);
AllocInst(BeMCInstKind_Mov, inst->mResult ? inst->mResult : inst->mArg0, BeMCOperand::FromReg(X64Reg_AL), instIdx++ + 1);
inst->mArg0 = BeMCOperand::FromReg(X64Reg_AL);