Fix the test: DCE optimized away everything.

Use volatile store to protect the generated PTX from DCE.

Patch by Jingyue Wu.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206763 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/NVPTX/local-stack-frame.ll b/test/CodeGen/NVPTX/local-stack-frame.ll
index 178dff1a5d3f04408ac232def17fa4d3263c060f..c0d7d1c3a638f1252816a4ac693c5772bb5af7f8 100644 (file)
--- a/test/CodeGen/NVPTX/local-stack-frame.ll
+++ b/test/CodeGen/NVPTX/local-stack-frame.ll
@@ -3,16 +3,16 @@
 
 ; Ensure we access the local stack properly
 
-; PTX32:        mov.u32         %r{{[0-9]+}}, __local_depot{{[0-9]+}};
-; PTX32:        cvta.local.u32  %SP, %r{{[0-9]+}};
-; PTX32:        ld.param.u32    %r{{[0-9]+}}, [foo_param_0];
-; PTX32:        st.u32  [%SP+0], %r{{[0-9]+}};
-; PTX64:        mov.u64         %rl{{[0-9]+}}, __local_depot{{[0-9]+}};
-; PTX64:        cvta.local.u64  %SP, %rl{{[0-9]+}};
-; PTX64:        ld.param.u32    %r{{[0-9]+}}, [foo_param_0];
-; PTX64:        st.u32  [%SP+0], %r{{[0-9]+}};
+; PTX32:        mov.u32          %r{{[0-9]+}}, __local_depot{{[0-9]+}};
+; PTX32:        cvta.local.u32   %SP, %r{{[0-9]+}};
+; PTX32:        ld.param.u32     %r{{[0-9]+}}, [foo_param_0];
+; PTX32:        st.volatile.u32  [%SP+0], %r{{[0-9]+}};
+; PTX64:        mov.u64          %rl{{[0-9]+}}, __local_depot{{[0-9]+}};
+; PTX64:        cvta.local.u64   %SP, %rl{{[0-9]+}};
+; PTX64:        ld.param.u32     %r{{[0-9]+}}, [foo_param_0];
+; PTX64:        st.volatile.u32  [%SP+0], %r{{[0-9]+}};
 define void @foo(i32 %a) {
   %local = alloca i32, align 4
-  store i32 %a, i32* %local
+  store volatile i32 %a, i32* %local
   ret void
 }