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re PR target/53976 ([SH] Unnecessary clrt/sett after bt/bf) 

gcc/
	PR target/53976
	* config/sh/sh_optimize_sett_clrt.cc
	(sh_optimize_sett_clrt::find_last_ccreg_values): Return bool instead
	of void.  Abort at complex edges.
	(sh_optimize_sett_clrt::execute): Do nothing if find_last_ccreg_values
	returned false.

From-SVN: r217987
This commit is contained in:
Oleg Endo 2014-11-23 21:16:26 +00:00
parent bc1b9ef151
commit 8be6500b53
2 changed files with 24 additions and 9 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
2014-11-23 Oleg Endo <olegendo@gcc.gnu.org>
PR target/53976
* config/sh/sh_optimize_sett_clrt.cc
(sh_optimize_sett_clrt::find_last_ccreg_values): Return bool instead
of void. Abort at complex edges.
(sh_optimize_sett_clrt::execute): Do nothing if find_last_ccreg_values
returned false.
2014-11-22 John David Anglin <danglin@gcc.gnu.org>
PR other/63694

24
gcc/config/sh/sh_optimize_sett_clrt.cc
View File

@ -126,7 +126,7 @@ private:
// Given a start insn and its basic block, recursively determine all
// possible ccreg values in all basic block paths that can lead to the
// start insn.
void find_last_ccreg_values (rtx_insn *start_insn, basic_block bb,
bool find_last_ccreg_values (rtx_insn *start_insn, basic_block bb,
std::vector<ccreg_value>& values_out,
std::vector<basic_block>& prev_visited_bb) const;
@ -239,8 +239,8 @@ sh_optimize_sett_clrt::execute (function* fun)
ccreg_values.clear ();
visited_bbs.clear ();
find_last_ccreg_values (PREV_INSN (i), bb, ccreg_values,
visited_bbs);
bool ok = find_last_ccreg_values (PREV_INSN (i), bb, ccreg_values,
visited_bbs);
log_msg ("number of ccreg values collected: %u\n",
(unsigned int)ccreg_values.size ());
@ -248,7 +248,7 @@ sh_optimize_sett_clrt::execute (function* fun)
// If all the collected values are equal and are equal to the
// constant value of the setcc insn, the setcc insn can be
// removed.
if (all_ccreg_values_equal (ccreg_values)
if (ok && all_ccreg_values_equal (ccreg_values)
&& rtx_equal_p (ccreg_values.front ().value, setcc_val))
{
log_msg ("all values are ");
@ -322,7 +322,7 @@ sh_optimize_sett_clrt
gcc_unreachable ();
}
void
bool
sh_optimize_sett_clrt
::find_last_ccreg_values (rtx_insn *start_insn, basic_block bb,
std::vector<ccreg_value>& values_out,
@ -361,7 +361,7 @@ sh_optimize_sett_clrt
log_msg ("\n");
values_out.push_back (v);
return;
return true;
}
if (any_condjump_p (i) && onlyjump_p (i) && !prev_visited_bb.empty ())
@ -385,7 +385,7 @@ sh_optimize_sett_clrt
log_msg ("\n");
values_out.push_back (v);
return;
return true;
}
}
@ -406,10 +406,14 @@ sh_optimize_sett_clrt
for (edge_iterator ei = ei_start (bb->preds); !ei_end_p (ei);
ei_next (&ei))
{
if (ei_edge (ei)->flags & EDGE_COMPLEX)
log_return (false, "aborting due to complex edge\n");
basic_block pred_bb = ei_edge (ei)->src;
pred_bb_count += 1;
find_last_ccreg_values (BB_END (pred_bb), pred_bb, values_out,
prev_visited_bb);
if (!find_last_ccreg_values (BB_END (pred_bb), pred_bb, values_out,
prev_visited_bb))
return false;
}
prev_visited_bb.pop_back ();
@ -432,6 +436,8 @@ sh_optimize_sett_clrt
values_out.push_back (v);
}
return true;
}
bool