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IRA: Don't create new regs for debug insns (PR80429) 

In split_live_ranges_for_shrink_wrap IRA also splits regs that are
only used in debug insns, leading to -fcompare-debug failures.


	PR rtl-optimization/80429
	* ira.c (split_live_ranges_for_shrink_wrap): Don't split regs that
	are only used in debug insns.

From-SVN: r246991
This commit is contained in:
Segher Boessenkool 2017-04-19 12:03:35 +02:00 committed by Segher Boessenkool
parent 46928a8fda
commit fd1ca3fe77
2 changed files with 26 additions and 5 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-04-19 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/80429
* ira.c (split_live_ranges_for_shrink_wrap): Don't split regs that
are only used in debug insns.
2017-04-19 Eric Botcazou <ebotcazou@adacore.com>
Vladimir Makarov <vmakarov@redhat.com>

25
gcc/ira.c
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@ -4992,25 +4992,40 @@ split_live_ranges_for_shrink_wrap (void)
if (!dest || dest == pic_offset_table_rtx)
continue;
rtx newreg = NULL_RTX;
bool need_newreg = false;
df_ref use, next;
for (use = DF_REG_USE_CHAIN (REGNO (dest)); use; use = next)
{
rtx_insn *uin = DF_REF_INSN (use);
next = DF_REF_NEXT_REG (use);
if (DEBUG_INSN_P (uin))
continue;
basic_block ubb = BLOCK_FOR_INSN (uin);
if (ubb == call_dom
|| dominated_by_p (CDI_DOMINATORS, ubb, call_dom))
{
if (!newreg)
newreg = ira_create_new_reg (dest);
validate_change (uin, DF_REF_REAL_LOC (use), newreg, true);
need_newreg = true;
break;
}
}
if (newreg)
if (need_newreg)
{
rtx newreg = ira_create_new_reg (dest);
for (use = DF_REG_USE_CHAIN (REGNO (dest)); use; use = next)
{
rtx_insn *uin = DF_REF_INSN (use);
next = DF_REF_NEXT_REG (use);
basic_block ubb = BLOCK_FOR_INSN (uin);
if (ubb == call_dom
|| dominated_by_p (CDI_DOMINATORS, ubb, call_dom))
validate_change (uin, DF_REF_REAL_LOC (use), newreg, true);
}
rtx_insn *new_move = gen_move_insn (newreg, dest);
emit_insn_after (new_move, bb_note (call_dom));
if (dump_file)