This patch is a small improvement to DF, for an issue I noticed while
investigating PR 50826. We take note of, and may emit debug temps for,
REGs for which we won't emit REG_DEAD/REG_UNUSED notes. This is a
waste, removed with this patch.
Regstrapped on x86_64-linux-gnu and i686-linux-gnu. Ok to install?
for gcc/ChangeLog
from Alexandre Oliva <aol...@redhat.com>
PR debug/50826
* 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 2012-04-08 01:50:45.379141149 -0300
+++ gcc/df-problems.c 2012-04-08 02:05:13.406574358 -0300
@@ -3528,7 +3528,12 @@ 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);
continue;
}
break;
--
Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/ FSF Latin America board member
Free Software Evangelist Red Hat Brazil Compiler Engineer
