Fix combine EH related failure

[Alan Modra]

On Wed, Feb 18, 2004 at 10:13:58AM +1030, Alan Modra wrote:
> I also noticed some other places in combine.c that were checking for
> REG_UNUSED notes without looking for REG_EH_REGION.  A followup patch
> will address them..

Just one place matters.

	* combine.c (can_combine_p): Don't ignore SETs marked with
	REG_EH_REGION notes.

OK mainline, assuming bootstrap and no new regressions?  Should this go
on the 3.4 branch too?

Index: gcc/combine.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/combine.c,v
retrieving revision 1.410
diff -u -p -r1.410 combine.c
--- gcc/combine.c	17 Feb 2004 22:21:00 -0000	1.410
+++ gcc/combine.c	17 Feb 2004 23:58:15 -0000
@@ -963,6 +963,7 @@ can_combine_p (rtx insn, rtx i3, rtx pre
       for (i = 0; i < XVECLEN (PATTERN (insn), 0); i++)
 	{
 	  rtx elt = XVECEXP (PATTERN (insn), 0, i);
+	  rtx note;
 
 	  switch (GET_CODE (elt))
 	    {
@@ -1013,6 +1014,8 @@ can_combine_p (rtx insn, rtx i3, rtx pre
 	      /* Ignore SETs whose result isn't used but not those that
 		 have side-effects.  */
 	      if (find_reg_note (insn, REG_UNUSED, SET_DEST (elt))
+		  && (!(note = find_reg_note (insn, REG_EH_REGION, NULL_RTX))
+		      || INTVAL (XEXP (note, 0)) <= 0)
 		  && ! side_effects_p (elt))
 		break;
 

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre