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Re: fix incorrect debug temp added by df-problems

On Apr  9, 2012, Jakub Jelinek <> wrote, in response to
my posting to the wrong thread (now fixed):

> On Mon, Apr 09, 2012 at 03:29:05AM -0300, Alexandre Oliva wrote:
>> +			  && (!df_ignore_stack_reg (uregno)))

> Please remove the extra () around this line,
> 			  && !df_ignore_stack_reg (uregno))

> Ok for trunk with that change, thanks.

Thanks, here's what I've just installed.

This fixes a bug in pr43165.c with -Os -g.

for  gcc/ChangeLog
from  Alexandre Oliva  <>

	* df-problems.c (df_note_bb_compute): Do not take note of
	debug uses for whose REGs we won't emit DEAD or UNUSED notes.
Index: gcc/df-problems.c
--- gcc/df-problems.c.orig	2012-04-13 05:18:28.604788011 -0300
+++ gcc/df-problems.c	2012-04-13 06:58:42.053258184 -0300
@@ -3453,7 +3453,12 @@ df_note_bb_compute (unsigned int bb_inde
 		  if (debug_insn > 0)
-		      dead_debug_add (&debug, use, uregno);
+		      /* We won't add REG_UNUSED or REG_DEAD notes for
+			 these, so we don't have to mess with them in
+			 debug insns either.  */
+		      if (!bitmap_bit_p (artificial_uses, uregno)
+			  && !df_ignore_stack_reg (uregno))
+			dead_debug_add (&debug, use, uregno);
Alexandre Oliva, freedom fighter
You must be the change you wish to see in the world. -- Gandhi
Be Free! --   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer

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