1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/asm-hard-reg-error-4.c b/gcc/testsuite/gcc.dg/asm-hard-reg-error-4.c
new file mode 100644
index 0000000..465f24b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/asm-hard-reg-error-4.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+
+/* Verify output operands.  */
+
+int
+test (void)
+{
+  int x;
+  register int y __asm__ ("0");
+
+  /* Preserve status quo and don't error out.  */
+  __asm__ ("" : "=r" (x), "=r" (x));
+
+  /* Be more strict for hard register constraints and error out.  */
+  __asm__ ("" : "={0}" (x), "={1}" (x)); /* { dg-error "multiple outputs to lvalue 'x'" } */
+
+  /* Still error out in case of a mixture.  */
+  __asm__ ("" : "=r" (x), "={1}" (x)); /* { dg-error "multiple outputs to lvalue 'x'" } */
+
+  return x + y;
+}