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[ConstantFolding] Merge constant gep inrange attributes #150546

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Merged
merged 1 commit into from
Jul 25, 2025
Merged

[ConstantFolding] Merge constant gep inrange attributes #150546

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11 changes: 5 additions & 6 deletions llvm/lib/Analysis/ConstantFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -929,12 +929,11 @@ Constant *SymbolicallyEvaluateGEP(const GEPOperator *GEP,
if (!AllConstantInt)
break;

// TODO: Try to intersect two inrange attributes?
if (!InRange) {
InRange = GEP->getInRange();
if (InRange)
// Adjust inrange by offset until now.
InRange = InRange->sextOrTrunc(BitWidth).subtract(Offset);
// Adjust inrange offset and intersect inrange attributes
if (auto GEPRange = GEP->getInRange()) {
auto AdjustedGEPRange = GEPRange->sextOrTrunc(BitWidth).subtract(Offset);
InRange =
InRange ? InRange->intersectWith(AdjustedGEPRange) : AdjustedGEPRange;
}

Ptr = cast<Constant>(GEP->getOperand(0));
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28 changes: 28 additions & 0 deletions llvm/test/Transforms/InstSimplify/ConstProp/gep.ll
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Expand Up @@ -29,3 +29,31 @@ define ptr @f2() {
;
ret ptr getelementptr (ptr, ptr getelementptr inbounds inrange(0, 8) ([3 x ptr], ptr @vt, i64 0, i64 1), i64 3)
}

define ptr @f3() {
; CHECK-LABEL: @f3(
; CHECK-NEXT: ret ptr getelementptr inbounds nuw inrange(-8, 0) (i8, ptr @vt, i64 16)
;
ret ptr getelementptr inrange(-16, 8) (ptr, ptr getelementptr inbounds inrange(0, 8) ([3 x ptr], ptr @vt, i64 0, i64 1), i64 1)
}

define ptr @f4() {
; CHECK-LABEL: @f4(
; CHECK-NEXT: ret ptr getelementptr inbounds nuw inrange(-8, 8) (i8, ptr @vt, i64 16)
;
ret ptr getelementptr inrange(-16, 8) (ptr, ptr getelementptr inbounds inrange(0, 24) ([3 x ptr], ptr @vt, i64 0, i64 1), i64 1)
}

define ptr @f5() {
; CHECK-LABEL: @f5(
; CHECK-NEXT: ret ptr getelementptr inbounds nuw inrange(0, 0) (i8, ptr @vt, i64 16)
;
ret ptr getelementptr inrange(0, 8) (ptr, ptr getelementptr inbounds inrange(0, 8) ([3 x ptr], ptr @vt, i64 0, i64 0), i64 2)
}

define ptr @f6() {
; CHECK-LABEL: @f6(
; CHECK-NEXT: ret ptr getelementptr inbounds nuw inrange(-8, 8) (i8, ptr @vt, i64 16)
;
ret ptr getelementptr inrange(-8, 8) (ptr, ptr getelementptr inbounds inrange(-8, 16) ([3 x ptr], ptr @vt, i64 0, i64 1), i64 1)
}