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re PR debug/52983 (internal compiler error: in df_uses_record, at df-scan.c:3243)

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PR debug/52983
PR debug/48866
* dce.c (word_dce_process_block): Insert debug temps only if the
insn is not marked.
(dce_process_block): Likewise, and if debug.used is not empty,
and only after iterating over all DEFs that might mark the insn.

From-SVN: r188527
This commit is contained in:
Alexandre Oliva 2012-06-13 20:41:55 +00:00 • committed by Alexandre Oliva
parent 21d01365ab
commit 39bc0f01ef
2 changed files with 25 additions and 14 deletions
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9
gcc/ChangeLog
View file

@ -1,3 +1,12 @@
2012-06-13 Alexandre Oliva <aoliva@redhat.com>
PR debug/52983
PR debug/48866
* dce.c (word_dce_process_block): Insert debug temps only if the
insn is not marked.
(dce_process_block): Likewise, and if debug.used is not empty,
and only after iterating over all DEFs that might mark the insn.
2012-06-13 Alexandre Oliva <aoliva@redhat.com>
* common.opt (ftree-coalesce-inlined-vars): New.

30
gcc/dce.c
View file

@ -857,8 +857,9 @@ word_dce_process_block (basic_block bb, bool redo_out)
anything in local_live. */
if (marked_insn_p (insn))
df_word_lr_simulate_uses (insn, local_live);
if (debug.used && !bitmap_empty_p (debug.used))
/* Insert debug temps for dead REGs used in subsequent debug
insns. */
else if (debug.used && !bitmap_empty_p (debug.used))
{
df_ref *def_rec;
@ -939,18 +940,13 @@ dce_process_block (basic_block bb, bool redo_out, bitmap au)
/* The insn is needed if there is someone who uses the output. */
if (!needed)
for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++)
{
dead_debug_insert_temp (&debug, DF_REF_REGNO (*def_rec), insn,
DEBUG_TEMP_BEFORE_WITH_VALUE);
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;
}
}
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. */
@ -960,6 +956,12 @@ dce_process_block (basic_block bb, bool redo_out, bitmap au)
anything in local_live. */
if (needed)
df_simulate_uses (insn, local_live);
/* Insert debug temps for dead REGs used in subsequent debug
insns. */
else if (debug.used && !bitmap_empty_p (debug.used))
for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++)
dead_debug_insert_temp (&debug, DF_REF_REGNO (*def_rec), insn,
DEBUG_TEMP_BEFORE_WITH_VALUE);
}
dead_debug_finish (&debug, NULL);