re PR rtl-optimization/53589 (ICE in maybe_record_trace_start with asm goto)

	PR rtl-optimization/53589
	* cfgrtl.c (force_nonfallthru_and_redirect): Do asm_goto_edge
	discovery even when e->dest != target.  If any LABEL_REF points
	to e->dest label, redirect it to target's label.

	* gcc.dg/torture/pr53589.c: New test.

From-SVN: r188428

gcc/ChangeLog

+2012-06-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/53589
+	* cfgrtl.c (force_nonfallthru_and_redirect): Do asm_goto_edge
+	discovery even when e->dest != target.  If any LABEL_REF points
+	to e->dest label, redirect it to target's label.
+
 2012-06-12  Chung-Lin Tang  <cltang@codesourcery.com>
 
 	* config/sh/sh.c (output_stack_adjust): Remove !epilogue_p

gcc/cfgrtl.c

@@ -1293,21 +1293,21 @@ force_nonfallthru_and_redirect (edge e, basic_block target, rtx jump_label)
     }
 
   /* If e->src ends with asm goto, see if any of the ASM_OPERANDS_LABELs
-     don't point to target label.  */
+     don't point to the target or fallthru label.  */
   if (JUMP_P (BB_END (e->src))
       && target != EXIT_BLOCK_PTR
-      && e->dest == target
       && (e->flags & EDGE_FALLTHRU)
       && (note = extract_asm_operands (PATTERN (BB_END (e->src)))))
     {
       int i, n = ASM_OPERANDS_LABEL_LENGTH (note);
 
       for (i = 0; i < n; ++i)
-	if (XEXP (ASM_OPERANDS_LABEL (note, i), 0) == BB_HEAD (target))
-	  {
+	{
+	  if (XEXP (ASM_OPERANDS_LABEL (note, i), 0) == BB_HEAD (e->dest))
+	    XEXP (ASM_OPERANDS_LABEL (note, i), 0) = block_label (target);
+	  if (XEXP (ASM_OPERANDS_LABEL (note, i), 0) == BB_HEAD (target))
 	    asm_goto_edge = true;
-	    break;
-	  }
+	}
     }
 
   if (EDGE_COUNT (e->src->succs) >= 2 || abnormal_edge_flags || asm_goto_edge)

gcc/testsuite/ChangeLog

+2012-06-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/53589
+	* gcc.dg/torture/pr53589.c: New test.
+
 2012-06-12  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	PR target/50749

gcc/testsuite/gcc.dg/torture/pr53589.c

+/* PR rtl-optimization/53589 */
+/* { dg-do compile } */
+
+extern void foo (void) __attribute__ ((__noreturn__));
+
+void
+bar (int x)
+{
+  if (x < 0)
+    foo ();
+  if (x == 0)
+    return;
+  __asm goto ("# %l[lab]" : : : : lab);
+lab:;
+}