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-rw-r--r--clang/test/Sema/asm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/clang/test/Sema/asm.c b/clang/test/Sema/asm.c
index 52611faf3db..73d081ddd38 100644
--- a/clang/test/Sema/asm.c
+++ b/clang/test/Sema/asm.c
@@ -79,3 +79,9 @@ int test7(unsigned long long b) {
// <rdar://problem/7574870>
asm volatile (""); // expected-warning {{meaningless 'volatile' on asm outside function}}
+
+// PR3904
+int test8(int i) {
+ // A number in an input constraint can't point to a read-write constraint.
+ asm ("" : "+r" (i), "=r"(i) : "0" (i)); // expected-error{{invalid input constraint '0' in asm}}
+}
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