forked from OSchip/llvm-project
42 lines
1.1 KiB
LLVM
42 lines
1.1 KiB
LLVM
; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info 2>&1 | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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; BasicAA's guard against use-def cycles shouldn't prevent it from
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; analyzing use-def dags.
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; CHECK: MustAlias: i8* %base, i8* %phi
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; CHECK: MustAlias: i8* %phi, i8* %wwa
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; CHECK: MustAlias: i8* %phi, i8* %wwb
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; CHECK: MustAlias: i16* %bigbase, i8* %phi
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define i8 @foo(i8* %base, i1 %x, i1 %w) {
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entry:
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br i1 %w, label %wa, label %wb
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wa:
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%wwa = bitcast i8* %base to i8*
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br label %wc
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wb:
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%wwb = bitcast i8* %base to i8*
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br label %wc
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wc:
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%first = phi i8* [ %wwa, %wa ], [ %wwb, %wb ]
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%fc = bitcast i8* %first to i8*
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br i1 %x, label %xa, label %xb
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xa:
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%xxa = bitcast i8* %fc to i8*
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br label %xc
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xb:
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%xxb = bitcast i8* %fc to i8*
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br label %xc
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xc:
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%phi = phi i8* [ %xxa, %xa ], [ %xxb, %xb ]
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store i8 0, i8* %phi
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%bigbase = bitcast i8* %base to i16*
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store i16 -1, i16* %bigbase
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%loaded = load i8, i8* %phi
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ret i8 %loaded
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}
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