[libcxx] r322031 - Make rehash(0) work with ubsan's unsigned-integer-overflow.

[Dan Albert via cfe-commits]

Author: danalbert
Date: Mon Jan  8 13:49:12 2018
New Revision: 322031

URL: http://llvm.org/viewvc/llvm-project?rev=322031&view=rev
Log:
Make rehash(0) work with ubsan's unsigned-integer-overflow.

Reviewers: mclow.lists, EricWF

Reviewed By: mclow.lists

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D40743

Modified:
    libcxx/trunk/include/__hash_table

Modified: libcxx/trunk/include/__hash_table
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/__hash_table?rev=322031&r1=322030&r2=322031&view=diff
==============================================================================
--- libcxx/trunk/include/__hash_table (original)
+++ libcxx/trunk/include/__hash_table Mon Jan  8 13:49:12 2018
@@ -2136,7 +2136,7 @@ template <class _Tp, class _Hash, class
 void
 __hash_table<_Tp, _Hash, _Equal, _Alloc>::rehash(size_type __n)
 {
-    if (__n == 1)
+    if (__n < 2)
         __n = 2;
     else if (__n & (__n - 1))
         __n = __next_prime(__n);