Hi.
Following patch reverts the hunk that was removed in r237103.
Patch can bootstrap & passes regression tests on x86_64-linux-gnu.
Patch is approved by Honza.
Thanks,
Martin
>From e31bef9738193edd46fae118074bd7f241f366c2 Mon Sep 17 00:00:00 2001
From: marxin <mli...@suse.cz>
Date: Thu, 23 Jun 2016 11:03:27 +0200
Subject: [PATCH] Fix PR middle-end/71619
gcc/ChangeLog:
2016-06-23 Martin Liska <mli...@suse.cz>
PR middle-end/71619
* predict.c (predict_loops): Revert the hunk that was removed
in r237103.
gcc/testsuite/ChangeLog:
2016-06-23 Martin Liska <mli...@suse.cz>
* gcc.dg/pr71619.c: New test.
---
gcc/predict.c | 6 +++++-
gcc/testsuite/gcc.dg/pr71619.c | 11 +++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/pr71619.c
diff --git a/gcc/predict.c b/gcc/predict.c
index 470de8a..d505d9c 100644
--- a/gcc/predict.c
+++ b/gcc/predict.c
@@ -1769,7 +1769,11 @@ predict_loops (void)
else
continue;
- gcc_checking_assert (nitercst);
+ /* If the prediction for number of iterations is zero, do not
+ predict the exit edges. */
+ if (nitercst == 0)
+ continue;
+
probability = RDIV (REG_BR_PROB_BASE, nitercst);
predict_edge (ex, predictor, probability);
}
diff --git a/gcc/testsuite/gcc.dg/pr71619.c b/gcc/testsuite/gcc.dg/pr71619.c
new file mode 100644
index 0000000..e1404bc
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr71619.c
@@ -0,0 +1,11 @@
+/* PR 71619 */
+
+/* { dg-do compile } */
+/* { dg-options "-O --param=max-predicted-iterations=0" } */
+
+void
+foo ()
+{
+ int count = -10;
+ while (count++);
+}
--
2.8.4
