[ARM] Add regression test for the earlyclobber constraint of ARM STRB.

The constraint was added in r213369.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213730 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/ARM/2014-07-18-earlyclobber-str-post.ll b/test/CodeGen/ARM/2014-07-18-earlyclobber-str-post.ll
index b65dc0c44dcc411dc691368c18d66e2ede266d91..df7d2457e763215a4626998f37fefd892e25df95 100644 (file)
--- a/test/CodeGen/ARM/2014-07-18-earlyclobber-str-post.ll
+++ b/test/CodeGen/ARM/2014-07-18-earlyclobber-str-post.ll
@@ -21,3 +21,13 @@ define i16* @earlyclobber-strh-post(i16* %addr) nounwind {
   %new = getelementptr i16* %addr, i32 1
   ret i16* %new
 }
+
+define i8* @earlyclobber-strb-post(i8* %addr) nounwind {
+; CHECK-LABEL: earlyclobber-strb-post
+; CHECK-NOT: strb r[[REG:[0-9]+]], [r[[REG]]], #1
+  %val = ptrtoint i8* %addr to i32
+  %tr = trunc i32 %val to i8
+  store i8 %tr, i8* %addr
+  %new = getelementptr i8* %addr, i32 1
+  ret i8* %new
+}