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[IR] Add support for samesign in Operator::hasPoisonGeneratingFlags #112358

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Merged
merged 3 commits into from
Oct 15, 2024
Merged

[IR] Add support for samesign in Operator::hasPoisonGeneratingFlags #112358

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3046d48
[InstCombine] Add pre-commit tests. NFC.
dtcxzyw Oct 15, 2024
d3e1068
[IR] Add support for `samesign` in `Operator::hasPoisonGeneratingFlags`
dtcxzyw Oct 15, 2024
3dd63d9
[InstCombine] Add a test for logical or
dtcxzyw Oct 15, 2024
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2 changes: 2 additions & 0 deletions llvm/lib/IR/Operator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,8 @@ bool Operator::hasPoisonGeneratingFlags() const {
if (auto *NNI = dyn_cast<PossiblyNonNegInst>(this))
return NNI->hasNonNeg();
return false;
case Instruction::ICmp:
return cast<ICmpInst>(this)->hasSameSign();
default:
if (const auto *FP = dyn_cast<FPMathOperator>(this))
return FP->hasNoNaNs() || FP->hasNoInfs();
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22 changes: 22 additions & 0 deletions llvm/test/Transforms/InstCombine/icmp.ll
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Expand Up @@ -5365,3 +5365,25 @@ define i1 @icmp_and_inv_pow2_or_zero_ne_0(i32 %A, i32 %B) {
%cmp = icmp ne i32 %and, 0
ret i1 %cmp
}

define i1 @icmp_samesign_logical_and(i32 %In) {
; CHECK-LABEL: @icmp_samesign_logical_and(
; CHECK-NEXT: [[C2:%.*]] = icmp eq i32 [[IN:%.*]], 1
; CHECK-NEXT: ret i1 [[C2]]
;
%c1 = icmp samesign sgt i32 %In, -1
%c2 = icmp samesign eq i32 %In, 1
%V = select i1 %c1, i1 %c2, i1 false
ret i1 %V
}

define i1 @icmp_samesign_logical_or(i32 %In) {
; CHECK-LABEL: @icmp_samesign_logical_or(
; CHECK-NEXT: [[V:%.*]] = icmp ne i32 [[IN:%.*]], 1
; CHECK-NEXT: ret i1 [[V]]
;
%c1 = icmp samesign slt i32 %In, 0
%c2 = icmp samesign ne i32 %In, 1
%V = select i1 %c1, i1 true, i1 %c2
ret i1 %V
}
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