Use sse4.2 CRC32 instructions to hash when available.

src/core/SkResourceCache.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-#include "SkChecksum.h"
 #include "SkMessageBus.h"
 #include "SkMipMap.h"
 #include "SkMutex.h"
+#include "SkOpts.h"
 #include "SkPixelRef.h"
 #include "SkResourceCache.h"
 #include "SkTraceMemoryDump.h"
 
 #include <stddef.h>
 #include <stdlib.h>
 
 DECLARE_SKMESSAGEBUS_MESSAGE(SkResourceCache::PurgeSharedIDMessage)
 
 // This can be defined by the caller's build system
@@ skipping 17 matching lines @@
     static const int kLocal32s = kUnhashedLocal32s + kHashedLocal32s;
 
     static_assert(sizeof(Key) == (kLocal32s << 2), "unaccounted_key_locals");
     static_assert(sizeof(Key) == offsetof(Key, fNamespace) + sizeof(fNamespace),
                  "namespace_field_must_be_last");
 
     fCount32 = SkToS32(kLocal32s + (dataSize >> 2));
     fSharedID_lo = (uint32_t)sharedID;
     fSharedID_hi = (uint32_t)(sharedID >> 32);
     fNamespace = nameSpace;
-    // skip unhashed fields when computing the murmur
-    fHash = SkChecksum::Murmur3(this->as32() + kUnhashedLocal32s,
-                                (fCount32 - kUnhashedLocal32s) << 2);
+    // skip unhashed fields when computing the hash
+    fHash = SkOpts::hash(this->as32() + kUnhashedLocal32s,
+                         (fCount32 - kUnhashedLocal32s) << 2);
 }
 
 #include "SkTDynamicHash.h"
 
 class SkResourceCache::Hash :
     public SkTDynamicHash<SkResourceCache::Rec, SkResourceCache::Key> {};
 
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ skipping 628 matching lines @@
         dump->dumpNumericValue(dumpName.c_str(), "size", "bytes", rec.bytesUsed());
         dump->setMemoryBacking(dumpName.c_str(), "malloc", nullptr);
     }
 }
 
 void SkResourceCache::DumpMemoryStatistics(SkTraceMemoryDump* dump) {
     // Since resource could be backed by malloc or discardable, the cache always dumps detailed
     // stats to be accurate.
     VisitAll(sk_trace_dump_visitor, dump);
 }