diff options
| author | Richard Guenther <rguenther@suse.de> | 2012-10-29 14:25:22 +0000 |
|---|---|---|
| committer | Richard Guenther <rguenther@suse.de> | 2012-10-29 14:25:22 +0000 |
| commit | 39ec753df59ac7ebdda9ceea56e9ee333ced30ba (patch) | |
| tree | cbaaa6dbd01c991e9f8bb98fafc21b063fcdcc02 /gcc/cfgloopmanip.c | |
| parent | b3e3752d460b8c27697cd27bc9e23bf338dfbe2b (diff) | |
2012-10-29 Richard Guenther <rguenther@suse.de>
PR middle-end/53695
* tracer.c (tracer): Fixup loop structure.
* cfgloopmanip.c (force_single_succ_latches): Add assert.
(fix_loop_structure): Re-compute loop latches and disambiguate
loops with multiple latches if required.
* gcc.dg/torture/pr53695.c: New testcase.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@192943 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cfgloopmanip.c')
| -rw-r--r-- | gcc/cfgloopmanip.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c index eae68ca43c7..b48e85883ce 100644 --- a/gcc/cfgloopmanip.c +++ b/gcc/cfgloopmanip.c @@ -1586,6 +1586,7 @@ force_single_succ_latches (void) continue; e = find_edge (loop->latch, loop->header); + gcc_checking_assert (e != NULL); split_edge (e); } @@ -1848,6 +1849,32 @@ fix_loop_structure (bitmap changed_bbs) } } + /* Then re-compute the single latch if there is one. */ + FOR_EACH_LOOP (li, loop, 0) + { + edge_iterator ei; + edge e, latch = NULL; + FOR_EACH_EDGE (e, ei, loop->header->preds) + if (dominated_by_p (CDI_DOMINATORS, e->src, loop->header)) + { + if (!latch) + latch = e; + else + { + latch = NULL; + break; + } + } + if (latch + && latch->src->loop_father == loop) + loop->latch = latch->src; + else + loop->latch = NULL; + } + + if (!loops_state_satisfies_p (LOOPS_MAY_HAVE_MULTIPLE_LATCHES)) + disambiguate_loops_with_multiple_latches (); + if (loops_state_satisfies_p (LOOPS_HAVE_PREHEADERS)) create_preheaders (CP_SIMPLE_PREHEADERS); |