Use sse4.2 CRC32 instructions to hash when available.

src/core/SkOpts.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCpu.h"
 #include "SkHalf.h"
 #include "SkOnce.h"
 #include "SkOpts.h"
 
 #if defined(SK_ARM_HAS_NEON)
     #define SK_OPTS_NS neon
 #elif SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSSE3
     #define SK_OPTS_NS ssse3
 #elif SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE3
     #define SK_OPTS_NS sse3
 #elif SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
     #define SK_OPTS_NS sse2
 #else
     #define SK_OPTS_NS portable
 #endif
 
 #include "SkBlend_opts.h"
 #include "SkBlitMask_opts.h"
 #include "SkBlitRow_opts.h"
 #include "SkBlurImageFilter_opts.h"
+#include "SkChecksum_opts.h"
 #include "SkColorCubeFilter_opts.h"
 #include "SkMorphologyImageFilter_opts.h"
 #include "SkSwizzler_opts.h"
 #include "SkTextureCompressor_opts.h"
 #include "SkXfermode_opts.h"
 
 namespace SkOpts {
     // Define default function pointer values here...
     // If our global compile options are set high enough, these defaults might even be
     // CPU-specialized, e.g. a typical x86-64 machine might start with SSE2 defaults.
@@ skipping 24 matching lines @@
     DEFINE_DEFAULT(RGBA_to_bgrA);
     DEFINE_DEFAULT(RGB_to_RGB1);
     DEFINE_DEFAULT(RGB_to_BGR1);
     DEFINE_DEFAULT(gray_to_RGB1);
     DEFINE_DEFAULT(grayA_to_RGBA);
     DEFINE_DEFAULT(grayA_to_rgbA);
     DEFINE_DEFAULT(inverted_CMYK_to_RGB1);
     DEFINE_DEFAULT(inverted_CMYK_to_BGR1);
 
     DEFINE_DEFAULT(srcover_srgb_srgb);
+
+    DEFINE_DEFAULT(hash_fn);
 #undef DEFINE_DEFAULT
 
     // Each Init_foo() is defined in src/opts/SkOpts_foo.cpp.
     void Init_ssse3();
     void Init_sse41();
-    void Init_sse42() {}
+    void Init_sse42();
     void Init_avx();
     void Init_avx2() {}
 
     static void init() {
     #if defined(SK_CPU_X86) && !defined(SK_BUILD_NO_OPTS)
         if (SkCpu::Supports(SkCpu::SSSE3)) { Init_ssse3(); }
         if (SkCpu::Supports(SkCpu::SSE41)) { Init_sse41(); }
         if (SkCpu::Supports(SkCpu::SSE42)) { Init_sse42(); }
         if (SkCpu::Supports(SkCpu::AVX  )) { Init_avx();   }
         if (SkCpu::Supports(SkCpu::AVX2 )) { Init_avx2();  }
     #endif
     }
 
     void Init() {
         static SkOnce once;
         once(init);
     }
 }  // namespace SkOpts