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[llvm-reduce] Reduce samesign flag from icmp #115492

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Merged
merged 1 commit into from
Nov 8, 2024
Merged

[llvm-reduce] Reduce samesign flag from icmp #115492

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16 changes: 16 additions & 0 deletions llvm/test/tools/llvm-reduce/reduce-flags.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -272,3 +272,19 @@ define i32 @trunc_nsw_keep(i64 %a) {
%op = trunc nsw i64 %a to i32
ret i32 %op
}

; CHECK-LABEL: @icmp_samesign_drop(
; INTERESTING: = icmp
; RESULT: icmp ult i32
define i1 @icmp_samesign_drop(i32 %a) {
%op = icmp samesign ult i32 %a, 10
ret i1 %op
}

; CHECK-LABEL: @icmp_samesign_keep(
; INTERESTING: = icmp samesign
; RESULT: icmp samesign ult i32
define i1 @icmp_samesign_keep(i32 %a) {
%op = icmp samesign ult i32 %a, 10
ret i1 %op
}
3 changes: 3 additions & 0 deletions llvm/tools/llvm-reduce/deltas/ReduceInstructionFlags.cpp
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Expand Up @@ -42,6 +42,9 @@ static void reduceFlagsInModule(Oracle &O, ReducerWorkItem &WorkItem) {
} else if (auto *PDI = dyn_cast<PossiblyDisjointInst>(&I)) {
if (PDI->isDisjoint() && !O.shouldKeep())
PDI->setIsDisjoint(false);
} else if (auto *ICmp = dyn_cast<ICmpInst>(&I)) {
if (ICmp->hasSameSign() && !O.shouldKeep())
ICmp->setSameSign(false);
} else if (auto *GEP = dyn_cast<GetElementPtrInst>(&I)) {
GEPNoWrapFlags NW = GEP->getNoWrapFlags();
if (NW.isInBounds() && !O.shouldKeep())
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