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reorg.c (relax_delay_slots): Take account of NOTE_INSN_SWITCH_TEXT_SECTIONS and targetm.can_follow_jump. 

* reorg.c (relax_delay_slots): Take account of NOTE_INSN_SWITCH_TEXT_SECTIONS
  and targetm.can_follow_jump.

From-SVN: r220235
This commit is contained in:
Kaz Kojima 2015-01-29 08:36:38 +00:00
parent f7f049fa46
commit 4897b529e2
2 changed files with 26 additions and 3 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2015-01-29 Kaz Kojima <kkojima@gcc.gnu.org>
PR target/64761
* reorg.c (switch_text_sections_between_p): New function.
(relax_delay_slots): Call it when testing if the jump insn
is removable. Use targetm.can_follow_jump when testing if
the conditional branch can follow an unconditional jump.
2015-01-27 Caroline Tice <cmtice@google.com>
Committing VTV Cywin/Ming patch for Patrick Wollgast

21
gcc/reorg.c
View File

@ -3213,6 +3213,19 @@ label_before_next_insn (rtx x, rtx scan_limit)
return insn;
}
/* Return TRUE if there is a NOTE_INSN_SWITCH_TEXT_SECTIONS note in between
BEG and END. */
static bool
switch_text_sections_between_p (const rtx_insn *beg, const rtx_insn *end)
{
const rtx_insn *p;
for (p = beg; p != end; p = NEXT_INSN (p))
if (NOTE_P (p) && NOTE_KIND (p) == NOTE_INSN_SWITCH_TEXT_SECTIONS)
return true;
return false;
}
/* Once we have tried two ways to fill a delay slot, make a pass over the
code to try to improve the results and to do such things as more jump
@ -3249,7 +3262,8 @@ relax_delay_slots (rtx_insn *first)
target_label = find_end_label (target_label);
if (target_label && next_active_insn (target_label) == next
&& ! condjump_in_parallel_p (insn))
&& ! condjump_in_parallel_p (insn)
&& ! (next && switch_text_sections_between_p (insn, next)))
{
delete_jump (insn);
continue;
@ -3264,12 +3278,13 @@ relax_delay_slots (rtx_insn *first)
/* See if this jump conditionally branches around an unconditional
jump. If so, invert this jump and point it to the target of the
second jump. */
second jump. Check if it's possible on the target. */
if (next && simplejump_or_return_p (next)
&& any_condjump_p (insn)
&& target_label
&& next_active_insn (target_label) == next_active_insn (next)
&& no_labels_between_p (insn, next))
&& no_labels_between_p (insn, next)
&& targetm.can_follow_jump (insn, next))
{
rtx label = JUMP_LABEL (next);