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tree-ssa-threadupdate.c (thread_through_all_blocks): Do not clobber the loop structure thread_block was unsuccessful.

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* tree-ssa-threadupdate.c (thread_through_all_blocks): Do not
	clobber the loop structure thread_block was unsuccessful.  If
	thread_block was unsuccessful, cleanup appropriately.

From-SVN: r205459
This commit is contained in:
Jeff Law 2013-11-27 11:47:43 -07:00 • committed by Jeff Law
parent df7a98a6c1
commit fa788bb403
2 changed files with 20 additions and 7 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2013-11-27 Jeff Law <law@redhat.com>
* tree-ssa-threadupdate.c (thread_through_all_blocks): Do not
clobber the loop structure thread_block was unsuccessful. If
thread_block was unsuccessful, cleanup appropriately.
2013-11-27 Chen Liqin <liqin.gcc@gmail.com>
* config/score/score.h (REG_CLASS_FROM_LETTER): Delete.

21
gcc/tree-ssa-threadupdate.c
View file

@ -1676,13 +1676,20 @@ thread_through_all_blocks (bool may_peel_loop_headers)
{
struct loop *loop = (*path)[0]->e->dest->loop_father;
retval |= thread_block ((*path)[0]->e->dest, false);
e->aux = NULL;
/* This jump thread likely totally scrambled this loop.
So arrange for it to be fixed up. */
loop->header = NULL;
loop->latch = NULL;
if (thread_block ((*path)[0]->e->dest, false))
{
/* This jump thread likely totally scrambled this loop.
So arrange for it to be fixed up. */
loop->header = NULL;
loop->latch = NULL;
e->aux = NULL;
}
else
{
delete_jump_thread_path (path);
e->aux = NULL;
ei_next (&ei);
}
}
}
else