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

From-SVN: r257939

* lto-partition.c (lto_balanced_map): Watch overflow.
From-SVN: r257939
97bb4812 · Jan Hubicka · Jan Hubicka · 1996c75e · 97bb4812 · 97bb4812
Commit 97bb4812 authored Feb 23, 2018 by Jan Hubicka Committed by Jan Hubicka Feb 23, 2018
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gcc/lto/ChangeLog
+4 -0

gcc/lto/lto-partition.c
+2 -1

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--- a/gcc/lto/ChangeLog
+++ b/gcc/lto/ChangeLog
 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
 	* lto.c (unify_scc): Register prevailing trees, not trees to be freed.
 	(read_cgraph_and_symbols): Use

--- 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);