From: Jan Hubicka <hubicka@ucw.cz>
Date: Fri, 23 Feb 2018 18:18:07 +0000 (+0100)
Subject: * lto-partition.c (lto_balanced_map): Watch overflow.
X-Git-Tag: basepoints/gcc-9~1026
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97bb48126b1f09e7751332e7e6ef1d63eb937994;p=thirdparty%2Fgcc.git

* lto-partition.c (lto_balanced_map): Watch overflow.

From-SVN: r257939
---

diff --git a/gcc/lto/ChangeLog b/gcc/lto/ChangeLog
index 62fec4983805..55013a81bb25 100644
--- a/gcc/lto/ChangeLog
+++ b/gcc/lto/ChangeLog
@@ -1,3 +1,7 @@
+2018-02-08  Jan Hubicka  <hubicka@ucw.cz>
+
+	* lto-partition.c (lto_balanced_map): Watch overflow.
+
 2018-02-08  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR ipa/81360
diff --git a/gcc/lto/lto-partition.c b/gcc/lto/lto-partition.c
index 6055dad99b50..60daafdf3750 100644
--- a/gcc/lto/lto-partition.c
+++ b/gcc/lto/lto-partition.c
@@ -757,7 +757,8 @@ lto_balanced_map (int n_lto_partitions, int max_partition_size)
 	  if (npartitions < n_lto_partitions)
 	    partition_size = total_size / (n_lto_partitions - npartitions);
 	  else
-	    partition_size = INT_MAX;
+	    /* Watch for overflow.  */
+	    partition_size = INT_MAX / 16;
 
 	  if (partition_size < PARAM_VALUE (MIN_PARTITION_SIZE))
 	    partition_size = PARAM_VALUE (MIN_PARTITION_SIZE);