File: load-constant-mem.ll

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llvm-toolchain-17 1%3A17.0.6-22
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; RUN: opt < %s -passes=gvn,instcombine -S | FileCheck %s
; PR4189
@G = external constant [4 x i32]

define i32 @test(ptr %p, i32 %i) nounwind {
entry:
	%P = getelementptr [4 x i32], ptr @G, i32 0, i32 %i
	%A = load i32, ptr %P
	store i8 4, ptr %p
	%B = load i32, ptr %P
	%C = sub i32 %A, %B
	ret i32 %C
}

; CHECK: define i32 @test(ptr %p, i32 %i) #0 {
; CHECK-NEXT: entry:
; CHECK-NEXT:   store i8 4, ptr %p, align 1
; CHECK-NEXT:   ret i32 0
; CHECK-NEXT: }