From fb2b8bf32b72a7976b2bdea1fa04c8af50786429 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Wed, 6 May 2020 10:23:15 +0200 Subject: [PATCH] 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 PR middle-end/94964 * cfgloopmanip.c (create_preheader): Require non-complex preheader edge for CP_SIMPLE_PREHEADERS. --- gcc/cfgloopmanip.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c index 50c7267ec49e..73134a20e337 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. */ -- 2.47.2