Use sse4.2 CRC32 instructions to hash when available.

src/gpu/text/GrStencilAndCoverTextContext.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrStencilAndCoverTextContext_DEFINED
 #define GrStencilAndCoverTextContext_DEFINED
 
 #include "GrDrawContext.h"
 #include "GrStyle.h"
 #include "SkDrawFilter.h"
+#include "SkOpts.h"
 #include "SkTextBlob.h"
 #include "SkTHash.h"
 #include "SkTInternalLList.h"
 #include "SkTLList.h"
 #include "batches/GrDrawPathBatch.h"
 
 class GrAtlasTextContext;
 class GrTextStrike;
 class GrPath;
 class SkSurfaceProps;
@@ skipping 89 matching lines @@
     // Text blobs/caches.
 
     class TextBlob : public SkTLList<TextRun, 1> {
     public:
         typedef SkTArray<uint32_t, true> Key;
 
         static const Key& GetKey(const TextBlob* blob) { return blob->key(); }
 
         static uint32_t Hash(const Key& key) {
             SkASSERT(key.count() > 1); // 1-length keys should be using the blob-id hash map.
-            return SkChecksum::Murmur3(key.begin(), sizeof(uint32_t) * key.count());
+            return SkOpts::hash(key.begin(), sizeof(uint32_t) * key.count());
         }
 
         TextBlob(uint32_t blobId, const SkTextBlob* skBlob, const SkPaint& skPaint)
             : fKey(&blobId, 1) { this->init(skBlob, skPaint); }
 
         TextBlob(const Key& key, const SkTextBlob* skBlob, const SkPaint& skPaint)
             : fKey(key) {
             // 1-length keys are unterstood to be the blob id and must use the other constructor.
             SkASSERT(fKey.count() > 1);
             this->init(skBlob, skPaint);
@@ skipping 16 matching lines @@
     void purgeToFit(const TextBlob&);
 
     GrAtlasTextContext*                                       fFallbackTextContext;
     SkTHashMap<uint32_t, TextBlob*>                           fBlobIdCache;
     SkTHashTable<TextBlob*, const TextBlob::Key&, TextBlob>   fBlobKeyCache;
     SkTInternalLList<TextBlob>                                fLRUList;
     size_t                                                    fCacheSize;
 };
 
 #endif