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| author | Richard Biener <rguenther@suse.de> | 2020-05-06 10:23:15 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2020-05-06 13:36:46 +0200 |
| commit | 6fc00b41e764219e2c88d8892d7c701c0d292a17 (patch) | |
| tree | 248cd6f3960cfb19096bf29f14a1e4a9b1645ec3 /gcc/cfgloopmanip.c | |
| parent | 371905d12259c180efb9b1f1b5716e969feb60f9 (diff) | |
| download | gcc-6fc00b41e764219e2c88d8892d7c701c0d292a17.tar.gz | |
middle-end/94964 - avoid EH loop entry with CP_SIMPLE_PREHEADERS
Loop optimizers expect to be able to insert on the preheader
edge w/o splitting it thus avoid ending up with a preheader
that enters the loop via an EH edge (or an abnormal edge).
2020-05-06 Richard Biener <rguenther@suse.de>
PR middle-end/94964
* cfgloopmanip.c (create_preheader): Require non-complex
preheader edge for CP_SIMPLE_PREHEADERS.
Diffstat (limited to 'gcc/cfgloopmanip.c')
| -rw-r--r-- | gcc/cfgloopmanip.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c index 50c7267ec49..73134a20e33 100644 --- a/gcc/cfgloopmanip.c +++ b/gcc/cfgloopmanip.c @@ -1506,9 +1506,10 @@ create_preheader (class loop *loop, int flags) else { /* If we want simple preheaders, also force the preheader to have - just a single successor. */ + just a single successor and a normal edge. */ if ((flags & CP_SIMPLE_PREHEADERS) - && !single_succ_p (single_entry->src)) + && ((single_entry->flags & EDGE_COMPLEX) + || !single_succ_p (single_entry->src))) need_forwarder_block = true; /* If we want fallthru preheaders, also create forwarder block when preheader ends with a jump or has predecessors from loop. */ |