OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

* dce.c (dce_process_block): Do not re-scan already marked instructions. 

From-SVN: r160262
This commit is contained in:
Jan Hubicka 2010-06-04 15:27:51 +02:00 committed by Jan Hubicka
parent 8ff49c29fd
commit f251709af5
2 changed files with 15 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
2010-06-04 Jan Hubicka <jh@suse.cz>
* dce.c (dce_process_block): Do not re-scan already marked instructions.
2010-06-04 Bernd Schmidt <bernds@codesourcery.com>
PR rtl-optimization/39871

23
gcc/dce.c
View File

@ -904,19 +904,18 @@ dce_process_block (basic_block bb, bool redo_out, bitmap au)
FOR_BB_INSNS_REVERSE (bb, insn)
if (INSN_P (insn))
{
bool needed = false;
bool needed = marked_insn_p (insn);
/* The insn is needed if there is someone who uses the output. */
for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++)
if (bitmap_bit_p (local_live, DF_REF_REGNO (*def_rec))
|| bitmap_bit_p (au, DF_REF_REGNO (*def_rec)))
{
needed = true;
break;
}
if (needed)
mark_insn (insn, true);
if (!needed)
for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++)
if (bitmap_bit_p (local_live, DF_REF_REGNO (*def_rec))
|| bitmap_bit_p (au, DF_REF_REGNO (*def_rec)))
{
needed = true;
mark_insn (insn, true);
break;
}
/* No matter if the instruction is needed or not, we remove
any regno in the defs from the live set. */
@ -924,7 +923,7 @@ dce_process_block (basic_block bb, bool redo_out, bitmap au)
/* On the other hand, we do not allow the dead uses to set
anything in local_live. */
if (marked_insn_p (insn))
if (needed)
df_simulate_uses (insn, local_live);
}