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Improvements to overflow arithmetic

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This commit is contained in:
Brian Fiete 2022-01-11 10:36:22 -05:00
parent eb375362a1
commit bf97431cdb
12 changed files with 91 additions and 45 deletions
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10
IDEHelper/Backend/BeMCContext.cpp
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@ -9226,7 +9226,7 @@ bool BeMCContext::DoLegalization()
else
{
bool addCanBeLEA =
((inst->mKind == BeMCInstKind_Sub) || (inst->mKind == BeMCInstKind_Add)) &&
((inst->mKind == BeMCInstKind_Sub) || (inst->mKind == BeMCInstKind_Add)) && (!inst->mDisableShortForm) &&
(arg0Type->mSize >= 2) && // Int8s don't have an LEA
(GetFixedOperand(inst->mResult).IsNativeReg()) && (arg0.IsNativeReg()) && (arg1.IsImmediateInt());
@ -10209,7 +10209,7 @@ bool BeMCContext::DoLegalization()
handled = true;
}
if (handled)
if (!handled)
{
if (inst->mResult)
{
@ -14338,6 +14338,7 @@ void BeMCContext::DoCodeEmission()
{
if ((inst->mResult) && (inst->mResult != inst->mArg0))
{
BF_ASSERT(!inst->mDisableShortForm);
BF_ASSERT(inst->mResult.IsNativeReg());
BF_ASSERT(inst->mArg0.IsNativeReg());
BF_ASSERT(inst->mArg1.IsImmediate());
@ -14538,9 +14539,9 @@ void BeMCContext::DoCodeEmission()
if (result)
{
BF_ASSERT(inst->mArg1.IsImmediate());
if ((inst->mArg0.IsNativeReg()) &&
if ((inst->mArg0.IsNativeReg()) && (!inst->mDisableShortForm) &&
((inst->mArg1.mImmediate == 2) || (inst->mArg1.mImmediate == 4) || (inst->mArg1.mImmediate == 8)))
{
{
// LEA form
auto resultType = GetType(inst->mArg0);
if (resultType->mTypeCode != BeTypeCode_Int8)
@ -16030,6 +16031,7 @@ BeMCOperand BeMCContext::AllocBinaryOp(BeMCInstKind instKind, const BeMCOperand&
if (overflowCheckKind != BeMCOverflowCheckKind_None)
{
mcInst->mDisableShortForm = true;
AllocInst(BeMCInstKind_CondBr, BeMCOperand::FromImmediate(1), BeMCOperand::FromCmpKind((overflowCheckKind == BeMCOverflowCheckKind_B) ? BeCmpKind_NB : BeCmpKind_NO));
AllocInst(BeMCInstKind_DbgBreak);
}