Merge pull request #929 from warrenfalk/fix32

fix a compile error on 32-bit (fixes #634)

util/crc32c.cc

@@ -292,10 +292,12 @@ static inline uint32_t LE_LOAD32(const uint8_t *p) {
 }
 
 #ifdef __SSE4_2__
+#ifdef __LP64__
 static inline uint64_t LE_LOAD64(const uint8_t *p) {
   return DecodeFixed64(reinterpret_cast<const char*>(p));
 }
 #endif
+#endif
 
 static inline void Slow_CRC32(uint64_t* l, uint8_t const **p) {
   uint32_t c = static_cast<uint32_t>(*l ^ LE_LOAD32(*p));
@@ -315,8 +317,15 @@ static inline void Slow_CRC32(uint64_t* l, uint8_t const **p) {
 
 static inline void Fast_CRC32(uint64_t* l, uint8_t const **p) {
 #ifdef __SSE4_2__
+#ifdef __LP64__
   *l = _mm_crc32_u64(*l, LE_LOAD64(*p));
   *p += 8;
+#else
+  *l = _mm_crc32_u32(static_cast<unsigned int>(*l), LE_LOAD32(*p));
+  *p += 4;
+  *l = _mm_crc32_u32(static_cast<unsigned int>(*l), LE_LOAD32(*p));
+  *p += 4;
+#endif
 #else
   Slow_CRC32(l, p);
 #endif