third_party/llvm-7.0/llvm/test/Transforms/GVN/null-aliases-nothing.ll

; RUN: opt < %s -basicaa -gvn -S | FileCheck %s

%t = type { i32 }
declare void @test1f(i8*)

define void @test1(%t* noalias %stuff ) {
    %p = getelementptr inbounds %t, %t* %stuff, i32 0, i32 0
    %before = load i32, i32* %p

    call void @test1f(i8* null)

    %after = load i32, i32* %p ; <--- This should be a dead load
    %sum = add i32 %before, %after

    store i32 %sum, i32* %p
    ret void
; CHECK: load
; CHECK-NOT: load
; CHECK: ret void
}