(record_label_references): Check for undefined label.

From-SVN: r11454

(record_label_references): Check for undefined label.
From-SVN: r11454
13684373 · Richard Kenner · 8d95e9ad · 13684373
Commit 13684373 authored Mar 05, 1996 by Richard Kenner
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gcc/reg-stack.c
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--- a/gcc/reg-stack.c
+++ b/gcc/reg-stack.c
@@ -483,6 +483,10 @@ record_label_references (insn, pat)
      if (GET_CODE (label) != CODE_LABEL)
 	abort ();
+      /* If this is an undefined label, LABEL_REFS (label) contains garbage. */
+      if (INSN_UID (label) == 0)
+	return;
      /* Don't make a duplicate in the code_label's chain. */
      for (ref = LABEL_REFS (label);