[llvm-commits] [llvm] r138902 - /llvm/trunk/test/Transforms/SCCP/atomic-load-store.ll

[Eli Friedman]

Author: efriedma
Date: Wed Aug 31 16:37:06 2011
New Revision: 138902

URL: http://llvm.org/viewvc/llvm-project?rev=138902&view=rev
Log:
Add tests for the transformations SCCP can do on atomic loads and stores (which are safe without any modifications).


Added:
    llvm/trunk/test/Transforms/SCCP/atomic-load-store.ll

Added: llvm/trunk/test/Transforms/SCCP/atomic-load-store.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/SCCP/atomic-load-store.ll?rev=138902&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/SCCP/atomic-load-store.ll (added)
+++ llvm/trunk/test/Transforms/SCCP/atomic-load-store.ll Wed Aug 31 16:37:06 2011
@@ -0,0 +1,30 @@
+; RUN: opt < %s -ipsccp -S | FileCheck %s
+
+; This transformation is safe for atomic loads and stores; check that it works.
+
+ at G = internal global i32 17
+ at 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
\ No newline at end of file