X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2Ftest%2FGroupVarintTest.cpp;h=2971ca1a06116d582cf801d721884cac27661c16;hb=275ca94d04e44f28cfa411668eb1c1dd8db90b80;hp=1e59016dd3d735c5096e6d0c2924a3b34682349e;hpb=5c77fedbef46995a71ffa268c9fcaf49efddd01b;p=folly.git

diff --git a/folly/test/GroupVarintTest.cpp b/folly/test/GroupVarintTest.cpp
index 1e59016d..2971ca1a 100644
--- a/folly/test/GroupVarintTest.cpp
+++ b/folly/test/GroupVarintTest.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,7 +15,11 @@
  */
 
 #include <stdarg.h>
-#include "folly/GroupVarint.h"
+#include <algorithm>
+#include <folly/GroupVarint.h>
+
+// On platforms where it's not supported, GroupVarint will be compiled out.
+#if HAVE_GROUP_VARINT
 
 #include <gtest/gtest.h>
 
@@ -53,7 +57,10 @@ void testGroupVarint32(uint32_t a, uint32_t b, uint32_t c, uint32_t d, ...) {
   EXPECT_EQ(expectedBytes.size(), size);
 
   std::vector<char> foundBytes;
-  foundBytes.resize(size + 4);
+
+  // ssse3 decoding requires that the source buffer have length >= 17,
+  // so that it can read 128 bits from &start[1] via _mm_loadu_si128.
+  foundBytes.resize(std::max(size + 4, 17UL));
   char* start = &(foundBytes.front());
   char* p = GroupVarint32::encode(start, a, b, c, d);
   EXPECT_EQ((void*)(start + size), (void*)p);
@@ -259,3 +266,4 @@ TEST(GroupVarint, GroupVarintDecoder) {
   }
 }
 
+#endif