SkFloatConvert

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 "SkHalf.h"
 #include "SkOnce.h"
 #include "SkOpts.h"
@@ skipping 46 matching lines @@
     #endif
 #elif !defined(SK_ARM_HAS_NEON)      && \
        defined(SK_CPU_ARM32)         && \
        defined(SK_BUILD_FOR_ANDROID) && \
       !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
     #include <cpu-features.h>
 #endif
 
 namespace SkOpts {
 
+    bool has_f16c = false;
+
     // 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.
     // They'll still get a chance to be replaced with even better ones, e.g. using SSE4.1.
     decltype(create_xfermode) create_xfermode = sk_default::create_xfermode;
     decltype(color_cube_filter_span) color_cube_filter_span = sk_default::color_cube_filter_span;
 
     decltype(box_blur_xx) box_blur_xx = sk_default::box_blur_xx;
     decltype(box_blur_xy) box_blur_xy = sk_default::box_blur_xy;
     decltype(box_blur_yx) box_blur_yx = sk_default::box_blur_yx;
@@ skipping 44 matching lines @@
         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();
 
+            if (abcd[2] & (1<<29)) {
+                has_f16c = true;
+            }
+
             // 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
 }