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[SROA]: Only defer trying partial sized ptr or ptr vector types #82279

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[SROA]: Only defer trying partial sized ptr or ptr vector types #82279

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5ea3531
[SROA] NFC: Extract common code to createAndCheckVectorTypesForPromotion
jrbyrnes Feb 19, 2024
31d5126
[SROA]: Only defer trying partial sized ptr or ptr vector types
jrbyrnes Feb 19, 2024
1d95dd8
fixup! convert createAndCheckVectorTypesForPromotion to a helper func…
jrbyrnes Feb 27, 2024
08bbc80
fixup! Clean up CandidateTysCopy
jrbyrnes Feb 28, 2024
80eede3
fixup! use API & minor code changes
jrbyrnes Feb 29, 2024
2d3b239
fixup! Don't use ArrayRef of CandidateTys
jrbyrnes Mar 1, 2024
ea54c6f
fixup! Add test for invariant memory across loop
jrbyrnes Mar 4, 2024
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4 changes: 4 additions & 0 deletions llvm/lib/Transforms/Scalar/SROA.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2263,6 +2263,8 @@ static VectorType *createAndCheckVectorTypesForPromotion(
const DataLayout &DL, SmallVectorImpl<VectorType *> &CandidateTys,
bool &HaveCommonEltTy, Type *&CommonEltTy, bool &HaveVecPtrTy,
bool &HaveCommonVecPtrTy, VectorType *&CommonVecPtrTy) {
[[maybe_unused]] auto OriginalElt =
CandidateTysCopy.size() ? CandidateTysCopy[0] : nullptr;
// Consider additional vector types where the element type size is a
// multiple of load/store element size.
for (Type *Ty : OtherTys) {
Expand All @@ -2272,6 +2274,8 @@ static VectorType *createAndCheckVectorTypesForPromotion(
// Make a copy of CandidateTys and iterate through it, because we
// might append to CandidateTys in the loop.
for (VectorType *const VTy : CandidateTysCopy) {
// The elements in the copy should remain invariant throughout the loop
assert(CandidateTysCopy[0] == OriginalElt && "Different Element");
unsigned VectorSize = DL.getTypeSizeInBits(VTy).getFixedValue();
unsigned ElementSize =
DL.getTypeSizeInBits(VTy->getElementType()).getFixedValue();
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30 changes: 30 additions & 0 deletions llvm/test/Transforms/SROA/vector-promotion.ll
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Expand Up @@ -1424,6 +1424,36 @@ entry:
ret <4 x i32> %0
}

; The following test should not crash the compiler
; (calls to CheckCandidateType from createAndCheckVectorTypesForPromotion may change the memory to hold CandidateTys.data())
define noundef zeroext i1 @CandidateTysRealloc() personality ptr null {
entry:
%alloca = alloca <4x i32>, align 16
store <4 x i32> <i32 1, i32 1, i32 1, i32 1>, ptr %alloca, align 16
br label %bb.1

bb.1:
br label %bb.1

bb.2:
%Load0 = load <4 x i32>, ptr %alloca, align 16
store <4 x i32> zeroinitializer, ptr %alloca, align 16
%Load1 = load <4 x i32>, ptr %alloca, align 16
br label %bb.3

bb.3:
br label %bb.3

bb.4:
%Load2 = load i64, ptr %alloca, align 16
%Load3 = load <4 x i32>, ptr %alloca, align 16
store <4 x i32> zeroinitializer, ptr %alloca, align 16
br label %bb.5

bb.5:
br label %bb.5
}

declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1)
declare void @llvm.lifetime.end.p0(i64, ptr)
;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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