1; XFAIL: *
2; RUN: opt -basic-aa -dse -S < %s | FileCheck %s
3
4target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
5target triple = "x86_64-apple-macosx10.7.0"
6
7; Sanity tests for atomic stores.
8; Note that it turns out essentially every transformation DSE does is legal on
9; atomic ops, just some transformations are not allowed across release-acquire pairs.
10
11@x = common global i32 0, align 4
12@y = common global i32 0, align 4
13
14; DSE across monotonic load (allowed as long as the eliminated store isUnordered)
15define i32 @test9() {
16; CHECK-LABEL: test9
17; CHECK-NOT: store i32 0
18; CHECK: store i32 1
19  store i32 0, i32* @x
20  %x = load atomic i32, i32* @y monotonic, align 4
21  store i32 1, i32* @x
22  ret i32 %x
23}
24