From 882af290c137dfab5d99b88e6dbecc5e75d85a0b Mon Sep 17 00:00:00 2001
From: Jan Hubicka <jh@suse.cz>
Date: Mon, 14 Aug 2023 17:55:33 +0200
Subject: [PATCH] Avoid division by zero in fold_loop_internal_call
My patch to fix profile after folding internal call is missing check for the
case profile was already zero before if-conversion.
gcc/ChangeLog:
PR gcov-profile/110988
* tree-cfg.cc (fold_loop_internal_call): Avoid division by zero.
---
gcc/tree-cfg.cc | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/gcc/tree-cfg.cc b/gcc/tree-cfg.cc
index fae80bb5b91e..272d5ce321eb 100644
--- a/gcc/tree-cfg.cc
+++ b/gcc/tree-cfg.cc
@@ -7734,11 +7734,14 @@ fold_loop_internal_call (gimple *g, tree value)
test. This should not happen as the guarded code should
start with pre-header. */
gcc_assert (single_pred_edge (taken_edge->dest));
- taken_edge->dest->count
- = taken_edge->dest->count.apply_scale (new_count,
- old_count);
- scale_strictly_dominated_blocks (taken_edge->dest,
- new_count, old_count);
+ if (old_count.nonzero_p ())
+ {
+ taken_edge->dest->count
+ = taken_edge->dest->count.apply_scale (new_count,
+ old_count);
+ scale_strictly_dominated_blocks (taken_edge->dest,
+ new_count, old_count);
+ }
}
}
}
--
GitLab