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| author | Jeff Law <law@redhat.com> | 2013-11-27 11:47:43 -0700 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2013-11-27 11:47:43 -0700 |
| commit | fa788bb403ace05d749fcfd753735e7d23c29760 (patch) | |
| tree | 18d719205b7e22b159b9aa3ff8951d111fc69d3c | |
| parent | df7a98a6c10da181f06dc705b145cebfae5ccd7f (diff) | |
| download | gcc-fa788bb403ace05d749fcfd753735e7d23c29760.zip gcc-fa788bb403ace05d749fcfd753735e7d23c29760.tar.gz gcc-fa788bb403ace05d749fcfd753735e7d23c29760.tar.bz2 | |
tree-ssa-threadupdate.c (thread_through_all_blocks): Do not clobber the loop structure thread_block was unsuccessful.
* 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
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/tree-ssa-threadupdate.c | 21 |
2 files changed, 20 insertions, 7 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 404d785..ad6468e 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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. diff --git a/gcc/tree-ssa-threadupdate.c b/gcc/tree-ssa-threadupdate.c index 1a52e47..24d0f42 100644 --- a/gcc/tree-ssa-threadupdate.c +++ b/gcc/tree-ssa-threadupdate.c @@ -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 |