diff options
| author | Richard Guenther <rguenther@suse.de> | 2012-10-29 14:25:22 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2012-10-29 14:25:22 +0000 |
| commit | 9dcbb3806d28c26b27137f6d3b8538a011b8960e (patch) | |
| tree | cbaaa6dbd01c991e9f8bb98fafc21b063fcdcc02 /gcc/cfgloopmanip.c | |
| parent | 5f41168186604d1c47d14a601a2c0f0f8f025082 (diff) | |
| download | gcc-9dcbb3806d28c26b27137f6d3b8538a011b8960e.zip gcc-9dcbb3806d28c26b27137f6d3b8538a011b8960e.tar.gz gcc-9dcbb3806d28c26b27137f6d3b8538a011b8960e.tar.bz2 | |
re PR middle-end/53695 (ICE: in dfs_enumerate_from, at cfganal.c:1221 with -O2 -ftracer and labels/gotos)
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.
From-SVN: r192943
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 eae68ca..b48e858 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); |