From 93236ad9e8fa9208e754e8806dc369e1a79dbdf7 Mon Sep 17 00:00:00 2001 From: Jan Hubicka Date: Thu, 3 Aug 2023 22:42:27 +0200 Subject: Fix profiledbootstrap Profiledbootstrap fails with ICE in update_loop_exit_probability_scale_dom_bbs called from loop unroling. The reason is that under relatively rare situations, we may run into case where loop has multiple exits and all are considered as likely but then we scale down the profile and one of the exits becomes unlikely. We pass around unadjusted_exit_count to scale exit probability correctly. In this case we may end up using uninitialized value and profile-count type intentionally bombs on that. gcc/ChangeLog: PR bootstrap/110857 * cfgloopmanip.cc (scale_loop_profile): (Un)initialize unadjusted_exit_count. --- gcc/cfgloopmanip.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/cfgloopmanip.cc b/gcc/cfgloopmanip.cc index 86360b5..b237ad4 100644 --- a/gcc/cfgloopmanip.cc +++ b/gcc/cfgloopmanip.cc @@ -742,7 +742,7 @@ scale_loop_profile (class loop *loop, profile_probability p, /* In a consistent profile unadjusted_exit_count should be same as count_in, however to preserve as much of the original info, avoid recomputing it. */ - profile_count unadjusted_exit_count; + profile_count unadjusted_exit_count = profile_count::uninitialized (); if (exit_edge) unadjusted_exit_count = exit_edge->count (); scale_loop_frequencies (loop, scale_prob); -- cgit v1.1