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