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27 lines
960 B
LLVM
27 lines
960 B
LLVM
; RUN: opt < %s -basic-aa -globals-aa -gvn -instcombine -S -enable-unsafe-globalsmodref-alias-results | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa,globals-aa -passes="require<globals-aa>,function(gvn,instcombine)" -S -enable-unsafe-globalsmodref-alias-results | FileCheck %s
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;
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; Note that this test relies on an unsafe feature of GlobalsModRef. While this
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; test is correct and safe, GMR's technique for handling this isn't generally.
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@G = internal global i32* null ; <i32**> [#uses=3]
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declare i8* @malloc(i32)
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define void @test() {
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%a = call i8* @malloc(i32 4)
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%A = bitcast i8* %a to i32*
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store i32* %A, i32** @G
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ret void
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}
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define i32 @test1(i32* %P) {
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; CHECK: ret i32 0
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%g1 = load i32*, i32** @G ; <i32*> [#uses=2]
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%h1 = load i32, i32* %g1 ; <i32> [#uses=1]
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store i32 123, i32* %P
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%g2 = load i32*, i32** @G ; <i32*> [#uses=0]
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%h2 = load i32, i32* %g1 ; <i32> [#uses=1]
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%X = sub i32 %h1, %h2 ; <i32> [#uses=1]
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ret i32 %X
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}
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