sse 4.2 detection

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 "SkOnce.h"
 #include "SkOpts.h"
 
@@ skipping 65 matching lines @@
 
     decltype(blit_row_color32) blit_row_color32 = sk_default::blit_row_color32;
 
     decltype(matrix_translate)       matrix_translate       = sk_default::matrix_translate;
     decltype(matrix_scale_translate) matrix_scale_translate = sk_default::matrix_scale_translate;
     decltype(matrix_affine)          matrix_affine          = sk_default::matrix_affine;
 
     // Each Init_foo() is defined in src/opts/SkOpts_foo.cpp.
     void Init_ssse3();
     void Init_sse41();
-    void Init_neon();
+    void Init_sse42() { SkDEBUGCODE( SkDebugf("sse 4.2 detected\n"); ) }

[Lei Zhang, 2015/11/17 00:11:32]

These are a wee bit spammy in debug builds. Every Chromium process that starts
up ends up printing this.

     void Init_avx()  { SkDEBUGCODE( SkDebugf("avx detected\n"); ) }
     void Init_avx2() { SkDEBUGCODE( SkDebugf("avx2 detected\n"); ) }
+    void Init_neon();
     //TODO: _dsp2, _armv7, _armv8, _x86, _x86_64, _sse42, ... ?

[Lei Zhang, 2015/11/17 00:11:32]

Remove sse42 from this list now?

 
     static void init() {
         // TODO: Chrome's not linking _sse* opts on iOS simulator builds.  Bug or feature?
     #if defined(SK_CPU_X86) && !defined(SK_BUILD_FOR_IOS)
         uint32_t abcd[] = {0,0,0,0};
         cpuid(abcd);
         if (abcd[2] & (1<< 9)) { Init_ssse3(); }
         if (abcd[2] & (1<<19)) { Init_sse41(); }
+        if (abcd[2] & (1<<20)) { Init_sse42(); }
 
         // AVX detection's kind of a pain.  This is cribbed from Chromium.
         if ( (  abcd[2] & (7<<26)) == (7<<26) &&    // Check bits 26-28 of ecx are all set,
              (xgetbv(0) & 6      ) == 6          ){ // and  check the OS supports XSAVE.
             Init_avx();
 
             // AVX2 additionally needs bit 5 set on ebx after calling cpuid(7).
             uint32_t abcd7[] = {0,0,0,0};
             cpuid7(abcd7);
             if (abcd7[1] & (1<<5)) { Init_avx2(); }
         }
 
     #elif !defined(SK_ARM_HAS_NEON)      && \
            defined(SK_CPU_ARM32)         && \
            defined(SK_BUILD_FOR_ANDROID) && \
           !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
         if (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) { Init_neon(); }
     #endif
     }
 
     SK_DECLARE_STATIC_ONCE(gInitOnce);
     void Init() { SkOnce(&gInitOnce, init); }
 
 #if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
     static struct AutoInit {
         AutoInit() { Init(); }
     } gAutoInit;
 #endif
 }