File: atomic-load-store.ll

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llvm-toolchain-20 1%3A20.1.6-1~exp1
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; RUN: opt < %s -passes=ipsccp -S | FileCheck %s

; This transformation is safe for atomic loads and stores; check that it works.

@G = internal global i32 17
@C = internal constant i32 222

define i32 @test1() {
	%V = load atomic i32, ptr @G seq_cst, align 4
	%C = icmp eq i32 %V, 17
	br i1 %C, label %T, label %F
T:
	store atomic i32 17, ptr @G seq_cst, align 4
	ret i32 %V
F:	
	store atomic i32 123, ptr @G seq_cst, align 4
	ret i32 0
}
; CHECK-LABEL: define i32 @test1(
; CHECK-NOT: store
; CHECK: ret i32 17

define i32 @test2() {
	%V = load atomic i32, ptr @C seq_cst, align 4
	ret i32 %V
}

; CHECK-LABEL: define i32 @test2(
; CHECK-NOT: load
; CHECK: ret i32 222