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llvm-reduce: Do not reduce alloca array sizes to 0 (#132864)

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Fixes #64340
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Matt Arsenault 2025-04-02 13:44:45 +07:00 committed by GitHub
parent 528e408b94
commit 09e19cfacf
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2 changed files with 74 additions and 0 deletions
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69
llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll Normal file
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@ -0,0 +1,69 @@
; RUN: llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-zero --test FileCheck --test-arg --check-prefix=CHECK --test-arg %s --test-arg --input-file %s -o %t
; RUN: FileCheck %s --check-prefixes=CHECK,ZERO < %t
; RUN: llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-one --test FileCheck --test-arg --check-prefix=CHECK --test-arg %s --test-arg --input-file %s -o %t
; RUN: FileCheck %s --check-prefixes=CHECK,ONE < %t
; RUN: llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-poison --test FileCheck --test-arg --check-prefix=CHECK --test-arg %s --test-arg --input-file %s -o %t
; RUN: FileCheck %s --check-prefixes=CHECK,POISON < %t
; CHECK-LABEL: @dyn_alloca(
; ZERO: %alloca = alloca i32, i32 %size, align 4
; ONE: %alloca = alloca i32, align 4
; POISON: %alloca = alloca i32, i32 %size, align 4
define void @dyn_alloca(i32 %size) {
%alloca = alloca i32, i32 %size
store i32 0, ptr %alloca
ret void
}
; CHECK-LABEL: @alloca_0_elt(
; ZERO: %alloca = alloca i32, i32 0, align 4
; ONE: %alloca = alloca i32, i32 0, align 4
; POISON: %alloca = alloca i32, i32 0, align 4
define void @alloca_0_elt() {
%alloca = alloca i32, i32 0
store i32 0, ptr %alloca
ret void
}
; CHECK-LABEL: @alloca_1_elt(
; ZERO: %alloca = alloca i32, align 4
; ONE: %alloca = alloca i32, align 4
; POISON: %alloca = alloca i32, align 4
define void @alloca_1_elt() {
%alloca = alloca i32, i32 1
store i32 0, ptr %alloca
ret void
}
; CHECK-LABEL: @alloca_1024_elt(
; ZERO: %alloca = alloca i32, i32 1024, align 4
; ONE: %alloca = alloca i32, align 4
; POISON: %alloca = alloca i32, i32 1024, align 4
define void @alloca_1024_elt() {
%alloca = alloca i32, i32 1024
store i32 0, ptr %alloca
ret void
}
; CHECK-LABEL: @alloca_poison_elt(
; ZERO: %alloca = alloca i32, i32 poison, align 4
; ONE: %alloca = alloca i32, align 4
; POISON: %alloca = alloca i32, i32 poison, align 4
define void @alloca_poison_elt() {
%alloca = alloca i32, i32 poison
store i32 0, ptr %alloca
ret void
}
; CHECK-LABEL: @alloca_constexpr_elt(
; ZERO: %alloca = alloca i32, i32 ptrtoint (ptr @alloca_constexpr_elt to i32)
; ONE: %alloca = alloca i32, align 4
; POISON: %alloca = alloca i32, i32 ptrtoint (ptr @alloca_constexpr_elt to i32)
define void @alloca_constexpr_elt() {
%alloca = alloca i32, i32 ptrtoint (ptr @alloca_constexpr_elt to i32)
store i32 0, ptr %alloca
ret void
}

5
llvm/tools/llvm-reduce/deltas/ReduceOperands.cpp
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@ -125,6 +125,11 @@ void llvm::reduceOperandsZeroDeltaPass(Oracle &O, ReducerWorkItem &WorkItem) {
auto ReduceValue = [](Use &Op) -> Value * {
if (!shouldReduceOperand(Op))
return nullptr;
// Avoid introducing 0-sized allocations.
if (isa<AllocaInst>(Op.getUser()))
return nullptr;
// Don't duplicate an existing switch case.
if (auto *IntTy = dyn_cast<IntegerType>(Op->getType()))
if (switchCaseExists(Op, ConstantInt::get(IntTy, 0)))