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cfgrtl.c (try_redirect_by_replacing_jump): Speed up the check that tests if all edges go to the same destination.

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* cfgrtl.c (try_redirect_by_replacing_jump): Speed up the
	check that tests if all edges go to the same destination.

From-SVN: r91334
This commit is contained in:
Kazu Hirata 2004-11-26 06:54:13 +00:00 • committed by Kazu Hirata
parent 87c111349f
commit 6a66a8a7a2
2 changed files with 15 additions and 7 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-11-26 Kazu Hirata <kazu@cs.umass.edu>
* cfgrtl.c (try_redirect_by_replacing_jump): Speed up the
check that tests if all edges go to the same destination.
2004-11-25 Jeff Law <law@redhat.com>
* timevar.def (TV_TREE_LOOP_INIT, TV_TREE_LOOP_FINI): New timevars.

17
gcc/cfgrtl.c
View file

@ -662,10 +662,8 @@ try_redirect_by_replacing_jump (edge e, basic_block target, bool in_cfglayout)
{
basic_block src = e->src;
rtx insn = BB_END (src), kill_from;
edge tmp;
rtx set;
int fallthru = 0;
edge_iterator ei;
/* If we are partitioning hot/cold basic blocks, we don't want to
mess up unconditional or indirect jumps that cross between hot
@ -682,12 +680,17 @@ try_redirect_by_replacing_jump (edge e, basic_block target, bool in_cfglayout)
|| BB_PARTITION (src) != BB_PARTITION (target)))
return NULL;
/* Verify that all targets will be TARGET. */
FOR_EACH_EDGE (tmp, ei, src->succs)
if (tmp->dest != target && tmp != e)
break;
/* We can replace or remove a complex jump only when we have exactly
two edges. Also, if we have exactly one outgoing edge, we can
redirect that. */
if (EDGE_COUNT (src->succs) >= 3
/* Verify that all targets will be TARGET. Specifically, the
edge that is not E must also go to TARGET. */
|| (EDGE_COUNT (src->succs) == 2
&& EDGE_SUCC (src, EDGE_SUCC (src, 0) == e)->dest != target))
return NULL;
if (tmp || !onlyjump_p (insn))
if (!onlyjump_p (insn))
return NULL;
if ((!optimize || reload_completed) && tablejump_p (insn, NULL, NULL))
return NULL;