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Add tests for the transformations SCCP can do on atomic loads and stores (which are safe without any modifications).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138902 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-08-31 21:37:06 +00:00
parent 94fca8300d
commit 24adac8b79
1 changed files with 30 additions and 0 deletions
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30
test/Transforms/SCCP/atomic-load-store.ll Normal file
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; RUN: opt < %s -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* @G seq_cst, align 4
%C = icmp eq i32 %V, 17
br i1 %C, label %T, label %F
T:
store atomic i32 17, i32* @G seq_cst, align 4
ret i32 %V
F:
store atomic i32 123, i32* @G seq_cst, align 4
ret i32 0
}
; CHECK: define i32 @test1
; CHECK-NOT: store
; CHECK: ret i32 17
define i32 @test2() {
%V = load atomic i32* @C seq_cst, align 4
ret i32 %V
}
; CHECK: define i32 @test2
; CHECK-NOT: load
; CHECK: ret i32 222