| /* |
| * 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" |
| #include "SkXfermode_opts.h" |
| |
| #if defined(SK_CPU_X86) |
| #if defined(SK_BUILD_FOR_WIN32) |
| #include <intrin.h> |
| static void cpuid(uint32_t abcd[4]) { __cpuid((int*)abcd, 1); } |
| #else |
| #include <cpuid.h> |
| static void cpuid(uint32_t abcd[4]) { __get_cpuid(1, abcd+0, abcd+1, abcd+2, abcd+3); } |
| #endif |
| #elif !defined(SK_ARM_HAS_NEON) && defined(SK_CPU_ARM32) && defined(SK_BUILD_FOR_ANDROID) |
| #include <cpu-features.h> |
| #endif |
| |
| namespace portable { // This helps identify methods from this file when debugging / profiling. |
| |
| static float rsqrt(float x) { |
| // Get initial estimate. |
| int i = *SkTCast<int*>(&x); |
| i = 0x5F1FFFF9 - (i>>1); |
| float estimate = *SkTCast<float*>(&i); |
| |
| // One step of Newton's method to refine. |
| const float estimate_sq = estimate*estimate; |
| estimate *= 0.703952253f*(2.38924456f-x*estimate_sq); |
| return estimate; |
| } |
| |
| template <typename T> |
| static void memsetT(T dst[], T val, int n) { while (n --> 0) { *dst++ = val; } } |
| |
| } // namespace portable |
| |
| namespace SkOpts { |
| // Define default function pointer values here... |
| decltype(rsqrt) rsqrt = portable::rsqrt; |
| decltype(memset16) memset16 = portable::memsetT<uint16_t>; |
| decltype(memset32) memset32 = portable::memsetT<uint32_t>; |
| decltype(create_xfermode) create_xfermode = SkCreate4pxXfermode; |
| |
| // Each Init_foo() is defined in src/opts/SkOpts_foo.cpp. |
| void Init_sse2(); |
| void Init_ssse3(); |
| void Init_sse41(); |
| void Init_neon(); |
| //TODO: _dsp2, _armv7, _armv8, _x86, _x86_64, _sse42, _avx, avx2, ... ? |
| |
| 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[3] & (1<<26)) { Init_sse2(); } |
| if (abcd[2] & (1<< 9)) { Init_ssse3(); } |
| if (abcd[2] & (1<<19)) { Init_sse41(); } |
| #elif defined(SK_ARM_HAS_NEON) |
| Init_neon(); |
| #elif defined(SK_CPU_ARM32) && defined(SK_BUILD_FOR_ANDROID) |
| 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 |
| } |