From a917d4f9b4188fa330f9e89108e8c8d804a0ed22 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 16 Aug 2011 01:28:22 +0000
Subject: Revert a bit of r137667; the logic in question can safely handle
 atomic load/store.

llvm-svn: 137702
---
 llvm/test/Transforms/FunctionAttrs/atomic.ll | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 llvm/test/Transforms/FunctionAttrs/atomic.ll

(limited to 'llvm/test/Transforms/FunctionAttrs')

diff --git a/llvm/test/Transforms/FunctionAttrs/atomic.ll b/llvm/test/Transforms/FunctionAttrs/atomic.ll
new file mode 100644
index 00000000000..62f8fa5a1df
--- /dev/null
+++ b/llvm/test/Transforms/FunctionAttrs/atomic.ll
@@ -0,0 +1,21 @@
+; RUN: opt -basicaa -functionattrs -S < %s | FileCheck %s
+
+; Atomic load/store to local doesn't affect whether a function is
+; readnone/readonly.
+define i32 @test1(i32 %x) uwtable ssp {
+; CHECK: define i32 @test1(i32 %x) uwtable readnone ssp {
+entry:
+  %x.addr = alloca i32, align 4
+  store atomic i32 %x, i32* %x.addr seq_cst, align 4
+  %r = load atomic i32* %x.addr seq_cst, align 4
+  ret i32 %r
+}
+
+; A function with an Acquire load is not readonly.
+define i32 @test2(i32* %x) uwtable ssp {
+; CHECK: define i32 @test2(i32 %x) uwtable ssp {
+entry:
+  %r = load atomic i32* %x seq_cst, align 4
+  ret i32 %r
+}
+
-- 
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