+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
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. */
/* 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);
}