From 3106cf8eca76df8b46d139b8f5ce5002200d660d Mon Sep 17 00:00:00 2001
From: Kenneth Heafield <github@kheafield.com>
Date: Mon, 24 Oct 2011 18:17:24 +0100
Subject: KenLM update.  EnumerateVocab moved up a namespace.  Fix trie
 building when bigrams are pruned.  Make Chris feel better about
 MurmurHashNative.

---
 klm/util/murmur_hash.cc | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

(limited to 'klm/util/murmur_hash.cc')

diff --git a/klm/util/murmur_hash.cc b/klm/util/murmur_hash.cc
index fec47fd9..ef5783fe 100644
--- a/klm/util/murmur_hash.cc
+++ b/klm/util/murmur_hash.cc
@@ -117,13 +117,18 @@ uint64_t MurmurHash64B ( const void * key, std::size_t len, unsigned int seed )
 
   return h;
 }
+// Trick to test for 64-bit architecture at compile time.  
+namespace {
+template <unsigned L> uint64_t MurmurHashNativeBackend(const void * key, std::size_t len, unsigned int seed) {
+  return MurmurHash64A(key, len, seed);
+}
+template <> uint64_t MurmurHashNativeBackend<4>(const void * key, std::size_t len, unsigned int seed) {
+  return MurmurHash64B(key, len, seed);
+}
+} // namespace
 
 uint64_t MurmurHashNative(const void * key, std::size_t len, unsigned int seed) {
-  if (sizeof(int) == 4) {
-    return MurmurHash64B(key, len, seed);
-  } else {
-    return MurmurHash64A(key, len, seed);
-  }
+  return MurmurHashNativeBackend<sizeof(void*)>(key, len, seed);
 }
 
 } // namespace util
-- 
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