llvm-6502/test/Transforms/GVN/load-constant-mem.ll

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; RUN: opt < %s -basicaa -gvn -instcombine -S | grep "ret i32 0"
; PR4189
@G = external constant [4 x i32]
define i32 @test(i8* %p, i32 %i) nounwind {
entry:
%P = getelementptr [4 x i32]* @G, i32 0, i32 %i
%A = load i32* %P
store i8 4, i8* %p
%B = load i32* %P
%C = sub i32 %A, %B
ret i32 %C
}