re PR rtl-optimization/54127 (ICE in maybe_record_trace_start with asm goto, --target=powerpc-unknown-linux-gnu)

	PR rtl-optimization/54127
	* cfgrtl.c (force_nonfallthru_and_redirect): When redirecting
	asm goto labels from BB_HEAD (e->dest) to target bb, decrement
	LABEL_NUSES of BB_HEAD (e->dest) and increment LABEL_NUSES of
	BB_HEAD (target) appropriately and adjust JUMP_LABEL and/or
	REG_LABEL_TARGET and REG_LABEL_OPERAND.

	* gcc.dg/torture/pr54127.c: New test.

From-SVN: r193470

4 files changed, 64 insertions, 2 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dd2d1a3..c5a80e1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2012-11-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/54127
+	* cfgrtl.c (force_nonfallthru_and_redirect): When redirecting
+	asm goto labels from BB_HEAD (e->dest) to target bb, decrement
+	LABEL_NUSES of BB_HEAD (e->dest) and increment LABEL_NUSES of
+	BB_HEAD (target) appropriately and adjust JUMP_LABEL and/or
+	REG_LABEL_TARGET and REG_LABEL_OPERAND.
+
 2012-11-12  Jakub Jelinek  <jakub@redhat.com>
 
 	* asan.c (instrument_builtin_call) <case BUILT_IN_BCOPY>: Fix up
@@ -11,7 +20,7 @@
 
 2012-11-12  David Edelsohn  <dje.gcc@gmail.com>
 
-	* asan.c: Include tm_p.h
+	* asan.c: Include tm_p.h.
 
 2012-11-12  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
 
diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c
index 1f601e5..8855bdf 100644
--- a/gcc/cfgrtl.c
+++ b/gcc/cfgrtl.c
@@ -1424,14 +1424,46 @@ force_nonfallthru_and_redirect (edge e, basic_block target, rtx jump_label)
       && (note = extract_asm_operands (PATTERN (BB_END (e->src)))))
     {
       int i, n = ASM_OPERANDS_LABEL_LENGTH (note);
+      bool adjust_jump_target = false;
 
       for (i = 0; i < n; ++i)
 	{
 	  if (XEXP (ASM_OPERANDS_LABEL (note, i), 0) == BB_HEAD (e->dest))
-	    XEXP (ASM_OPERANDS_LABEL (note, i), 0) = block_label (target);
+	    {
+	      LABEL_NUSES (XEXP (ASM_OPERANDS_LABEL (note, i), 0))--;
+	      XEXP (ASM_OPERANDS_LABEL (note, i), 0) = block_label (target);
+	      LABEL_NUSES (XEXP (ASM_OPERANDS_LABEL (note, i), 0))++;
+	      adjust_jump_target = true;
+	    }
 	  if (XEXP (ASM_OPERANDS_LABEL (note, i), 0) == BB_HEAD (target))
 	    asm_goto_edge = true;
 	}
+      if (adjust_jump_target)
+	{
+	  rtx insn = BB_END (e->src), note;
+	  rtx old_label = BB_HEAD (e->dest);
+	  rtx new_label = BB_HEAD (target);
+
+	  if (JUMP_LABEL (insn) == old_label)
+	    {
+	      JUMP_LABEL (insn) = new_label;
+	      note = find_reg_note (insn, REG_LABEL_TARGET, new_label);
+	      if (note)
+		remove_note (insn, note);
+	    }
+	  else
+	    {
+	      note = find_reg_note (insn, REG_LABEL_TARGET, old_label);
+	      if (note)
+		remove_note (insn, note);
+	      if (JUMP_LABEL (insn) != new_label
+		  && !find_reg_note (insn, REG_LABEL_TARGET, new_label))
+		add_reg_note (insn, REG_LABEL_TARGET, new_label);
+	    }
+	  while ((note = find_reg_note (insn, REG_LABEL_OPERAND, old_label))
+		 != NULL_RTX)
+	    XEXP (note, 0) = new_label;
+	}
     }
 
   if (EDGE_COUNT (e->src->succs) >= 2 || abnormal_edge_flags || asm_goto_edge)
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f236a2f..8a36924 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/54127
+	* gcc.dg/torture/pr54127.c: New test.
+
 2012-11-12  Steven Bosscher  <steven@gcc.gnu.org>
 	    Jakub Jelinek  <jakub@redhat.com>
 
diff --git a/gcc/testsuite/gcc.dg/torture/pr54127.c b/gcc/testsuite/gcc.dg/torture/pr54127.c
new file mode 100644
index 0000000..4f64998
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr54127.c
@@ -0,0 +1,16 @@
+/* PR rtl-optimization/54127 */
+/* { 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] %l[lab2]" : : : : lab, lab2);
+lab:;
+lab2:;
+}