--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr27531-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,116 @@
+/* PR target/27531 */
+/* This test case stressed the register allocator into reloading a LABEL_REF
+   on sparc, but didn't add a REG_LABEL note, ultimately causing the assembly
+   output to reference a label that had been eliminated.  */
+/* { dg-do link } */
+/* { dg-options "-O2" } */
+/* { dg-skip-if "requires io" { freestanding } }  */
+
+typedef struct _IO_FILE FILE;
+char const *RCSname;
+void *Locks;
+void * Head;
+struct Revpairs{
+    struct Revpairs * rnext;
+};
+extern char *strchr(const char *s, int c);
+extern int fprintf(FILE *, const char *format, ...);
+static void getrevpairs (char*);
+static int branchflag;
+static struct Revpairs *revlist, *Revlst;
+
+extern int warn(const char *msg, char *argv);
+extern int error(const char *msg, int c, char *argv);
+extern int recentdate(void *foo, void *bar);
+
+char *t;
+int main (int argc, char **argv)
+{
+    FILE *out;
+    char *a, **newargv;
+    void *currdate;
+    int descflag, selectflag;
+    int onlylockflag;
+    int onlyRCSflag;
+    int shownames;
+    descflag = selectflag = shownames = 1;
+    onlylockflag = onlyRCSflag = 0;
+    while (a = *++argv, 0<--argc)
+    {
+        switch (*a++)
+        {
+            case 'L':
+                onlylockflag = 1;
+            case 'N':
+                shownames = 0;
+            case 'R':
+                t = a;
+            case 'b':
+                branchflag = 1;
+            case 'r':
+                getrevpairs(a);
+        }
+        if (onlylockflag && !Locks)
+            fprintf(out, "%s\n", RCSname);
+        if (shownames) 
+            while( currdate)
+                recentdate(Head, currdate);
+    }
+}
+void getrevpairs(char *argv)
+{
+    char c;
+    struct Revpairs * nextrevpair;
+    int separator;
+    if (strchr(argv,':'))
+        separator = ':';
+    else
+    {
+        if (strchr(argv,'-') )
+            warn("`-' is obsolete in `-r%s'; use `:' instead", argv);
+        separator = '-';
+    }
+    for (;;)
+    {
+        nextrevpair->rnext = revlist;
+        for (;; c = *++argv)
+        {
+            switch (c)
+            {
+                default:
+                    continue;
+                case ' ':
+                case '\t':
+                case '\n':
+                    break;
+                case ':':
+                case '-':
+                    if (c == separator)
+                        continue;
+            }
+            break;
+        }
+        if (!c)
+            break;
+        error("missing `,' near `%c%s'", c, argv+1);
+    }
+}
+
+int warn(const char *msg, char *argv)
+{
+  t = 0;  /* this function needs side-effects.  */
+  return 0;
+}
+
+int error(const char *msg, int c, char *argv)
+{
+  t = 0; /* this function needs side-effects.  */
+  return 0;
+}
+
+int recentdate(void *foo, void *bar)
+{
+  t = 0; /* this function needs side-effects.  */
+  return 0;
+}
+