From 8d51bfe0f97a27c749c36003867901338833340a Mon Sep 17 00:00:00 2001
From: Jan Hubicka <jh@suse.cz>
Date: Wed, 14 Feb 2024 17:37:34 +0100
Subject: [PATCH] Fix ICE in loop splitting with -fno-guess-branch-probability
PR tree-optimization/111054
gcc/ChangeLog:
* tree-ssa-loop-split.cc (split_loop): Check for profile being present.
gcc/testsuite/ChangeLog:
* gcc.c-torture/compile/pr111054.c: New test.
---
gcc/testsuite/gcc.c-torture/compile/pr111054.c | 11 +++++++++++
gcc/tree-ssa-loop-split.cc | 3 ++-
2 files changed, 13 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.c-torture/compile/pr111054.c
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr111054.c b/gcc/testsuite/gcc.c-torture/compile/pr111054.c
new file mode 100644
index 000000000000..3c0d6e816b97
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr111054.c
@@ -0,0 +1,11 @@
+/* { dg-additional-options "-fno-guess-branch-probability" } */
+void *p, *q;
+int i, j;
+
+void
+foo (void)
+{
+ for (i = 0; i < 20; i++)
+ if (i < j)
+ p = q;
+}
diff --git a/gcc/tree-ssa-loop-split.cc b/gcc/tree-ssa-loop-split.cc
index 04215fe7937e..c0bb1b71d17c 100644
--- a/gcc/tree-ssa-loop-split.cc
+++ b/gcc/tree-ssa-loop-split.cc
@@ -712,7 +712,8 @@ split_loop (class loop *loop1)
? true_edge->probability.to_sreal () : (sreal)1;
sreal scale2 = false_edge->probability.reliable_p ()
? false_edge->probability.to_sreal () : (sreal)1;
- sreal div1 = loop1_prob.to_sreal ();
+ sreal div1 = loop1_prob.initialized_p ()
+ ? loop1_prob.to_sreal () : (sreal)1/(sreal)2;
/* +1 to get header interations rather than latch iterations and then
-1 to convert back. */
if (div1 != 0)
--
GitLab