1 files changed, 33 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/2014-07-18-earlyclobber-str-post.ll b/test/CodeGen/ARM/2014-07-18-earlyclobber-str-post.ll
new file mode 100644
index 0000000..df7d245
--- /dev/null
+++ b/test/CodeGen/ARM/2014-07-18-earlyclobber-str-post.ll
@@ -0,0 +1,33 @@
+; RUN: llc -mtriple=armv7-linux-gnueabihf %s -o - | FileCheck %s
+
+; Check that we don't create an unpredictable STR instruction,
+; e.g. str r0, [r0], #4
+
+define i32* @earlyclobber-str-post(i32* %addr) nounwind {
+; CHECK-LABEL: earlyclobber-str-post
+; CHECK-NOT: str r[[REG:[0-9]+]], [r[[REG]]], #4
+  %val = ptrtoint i32* %addr to i32
+  store i32 %val, i32* %addr
+  %new = getelementptr i32* %addr, i32 1
+  ret i32* %new
+}
+
+define i16* @earlyclobber-strh-post(i16* %addr) nounwind {
+; CHECK-LABEL: earlyclobber-strh-post
+; CHECK-NOT: strh r[[REG:[0-9]+]], [r[[REG]]], #2
+  %val = ptrtoint i16* %addr to i32
+  %tr = trunc i32 %val to i16
+  store i16 %tr, i16* %addr
+  %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
+}