Use sse4.2 CRC32 instructions to hash when available.

src/core/SkDescriptor.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkDescriptor_DEFINED
 #define SkDescriptor_DEFINED
 
-#include "SkChecksum.h"
+#include "SkOpts.h"
 #include "SkTypes.h"
 
 class SkDescriptor : SkNoncopyable {
 public:
     static size_t ComputeOverhead(int entryCount) {
         SkASSERT(entryCount >= 0);
         return sizeof(SkDescriptor) + entryCount * sizeof(Entry);
     }
 
     static SkDescriptor* Alloc(size_t length) {
@@ skipping 93 matching lines @@
 #endif
 
 private:
     uint32_t fChecksum;  // must be first
     uint32_t fLength;    // must be second
     uint32_t fCount;
 
     static uint32_t ComputeChecksum(const SkDescriptor* desc) {
         const uint32_t* ptr = (const uint32_t*)desc + 1; // skip the checksum field
         size_t len = desc->fLength - sizeof(uint32_t);
-        return SkChecksum::Murmur3(ptr, len);
+        return SkOpts::hash(ptr, len);
     }
 
     // private so no one can create one except our factories
     SkDescriptor() {}
 };
 
 #include "SkScalerContext.h"
 
 class SkAutoDescriptor : SkNoncopyable {
 public:
@@ skipping 30 matching lines @@
                         + sizeof(SkDescriptor::Entry) + sizeof(void*)                   // for typeface
                         + 32   // slop for occational small extras
     };
     SkDescriptor*   fDesc;
     uint32_t        fStorage[(kStorageSize + 3) >> 2];
 };
 #define SkAutoDescriptor(...) SK_REQUIRE_LOCAL_VAR(SkAutoDescriptor)
 
 
 #endif