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regrename.c (scan_rtx_reg): Handle the case where we write to an open chain in a smaller mode without...

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* regrename.c (scan_rtx_reg): Handle the case where we write to an
	open chain in a smaller mode without failing the entire block.

From-SVN: r175225
This commit is contained in:
Bernd Schmidt 2011-06-20 17:16:10 +00:00 committed by Bernd Schmidt
parent 222d3b39a6
commit 998c75b661
2 changed files with 18 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2011-06-20 Bernd Schmidt <bernds@codesourcery.com>
* regrename.c (scan_rtx_reg): Handle the case where we write to an
open chain in a smaller mode without failing the entire block.
2011-06-20 H.J. Lu <hongjiu.lu@intel.com>
PR middle-end/47725

17
gcc/regrename.c
View File

@ -721,25 +721,34 @@ scan_rtx_reg (rtx insn, rtx *loc, enum reg_class cl, enum scan_actions action,
In either case, we remove this element from open_chains. */
if ((action == terminate_dead || action == terminate_write)
&& superset)
&& (superset || subset))
{
unsigned nregs;
head->terminated = 1;
if (subset && !superset)
head->cannot_rename = 1;
head->next_chain = closed_chains;
closed_chains = head;
bitmap_clear_bit (&open_chains_set, head->id);
nregs = head->nregs;
while (nregs-- > 0)
CLEAR_HARD_REG_BIT (live_in_chains, head->regno + nregs);
{
CLEAR_HARD_REG_BIT (live_in_chains, head->regno + nregs);
if (subset && !superset
&& (head->regno + nregs < this_regno
|| head->regno + nregs >= this_regno + this_nregs))
SET_HARD_REG_BIT (live_hard_regs, head->regno + nregs);
}
*p = next;
if (dump_file)
fprintf (dump_file,
"Closing chain %s (%d) at insn %d (%s)\n",
"Closing chain %s (%d) at insn %d (%s%s)\n",
reg_names[head->regno], head->id, INSN_UID (insn),
scan_actions_name[(int) action]);
scan_actions_name[(int) action],
superset ? ", superset" : subset ? ", subset" : "");
}
else if (action == terminate_dead || action == terminate_write)
{