derek.holloway
7502bf64a4
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34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; RUN: opt -S -aa-pipeline=basic-aa -passes=dse < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; We incorrectly returned noalias in the example below for "ptr.64" and
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; "either_ptr.64".
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; PR18460
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%nested = type { %nested.i64 }
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%nested.i64 = type { i64 }
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define i64 @testcase(ptr noalias %p1, ptr noalias %p2,
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i32 %a, i32 %b) {
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%ptr = getelementptr inbounds %nested, ptr %p1, i64 -1, i32 0
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%ptr.64 = getelementptr inbounds %nested.i64, ptr %ptr, i64 0, i32 0
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%ptr2= getelementptr inbounds %nested, ptr %p2, i64 0, i32 0
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%cmp = icmp ult i32 %a, %b
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%either_ptr = select i1 %cmp, ptr %ptr2, ptr %ptr
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%either_ptr.64 = getelementptr inbounds %nested.i64, ptr %either_ptr, i64 0, i32 0
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; Because either_ptr.64 and ptr.64 can alias (we used to return noalias)
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; elimination of the first store is not valid.
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; CHECK: store i64 2
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; CHECK: load
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; CHECK: store i64 1
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store i64 2, ptr %ptr.64, align 8
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%r = load i64, ptr %either_ptr.64, align 8
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store i64 1, ptr %ptr.64, align 8
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ret i64 %r
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}
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