derek.holloway
7502bf64a4
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26 lines
857 B
LLVM
26 lines
857 B
LLVM
; RUN: opt -aa-pipeline=basic-aa -passes=aa-eval -print-all-alias-modref-info -disable-output %s 2>&1 | FileCheck %s
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; BasicAA must not look through llvm.ptrmask when decomposing a GEP into a
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; symbolic byte offset, because ptrmask preserves the underlying object but
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; can change the byte address. With %base 2-aligned:
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; %p = %base + 1
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; %q = ptrmask(%p, -2) == %base
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; %r = %q + 1 == %p
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; so %p and %r alias.
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declare ptr @llvm.ptrmask.p0.i64(ptr, i64)
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define i8 @ptrmask_gep_may_alias(ptr align 2 %base) {
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; CHECK-LABEL: Function: ptrmask_gep_may_alias
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; CHECK: MayAlias: i8* %p, i8* %r
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entry:
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%p = getelementptr i8, ptr %base, i64 1
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%q = call ptr @llvm.ptrmask.p0.i64(ptr %p, i64 -2)
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%r = getelementptr i8, ptr %q, i64 1
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store i8 7, ptr %p, align 1
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store i8 42, ptr %r, align 1
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%v = load i8, ptr %p, align 1
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ret i8 %v
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}
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