| ; RUN: opt < %s -basic-aa -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 |
| } |