199d6f2c0c
LoadStoreVectorizer hangs on certain examples, when its reorder function goes into a cycle. Detect this cycle and explicitly forbid it, using an assert, and document the resulting crash in a test-case under AArch64.
16 lines
537 B
LLVM
16 lines
537 B
LLVM
; REQUIRES: asserts
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; RUN: not --crash opt -mtriple=aarch64 -passes=load-store-vectorizer \
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; RUN: -disable-output %s 2>&1 | FileCheck %s
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define i32 @load_cycle(ptr %x) {
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; CHECK: Unexpected cycle while re-ordering instructions
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entry:
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%gep.x.1 = getelementptr inbounds [2 x i32], ptr %x, i32 0, i32 1
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%load.x.1 = load i32, ptr %gep.x.1
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%rem = urem i32 %load.x.1, 1
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%gep.x.2 = getelementptr inbounds [2 x i32], ptr %x, i32 %rem, i32 0
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%load.x.2 = load i32, ptr %gep.x.2
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%ret = add i32 %load.x.2, %load.x.1
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ret i32 %ret
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}
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