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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#define SkCpu_IMPL
#include "SkCpu.h"
#include "SkOnce.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); }
static void cpuid7(uint32_t abcd[4]) { __cpuidex((int*)abcd, 7, 0); }
static uint64_t xgetbv(uint32_t xcr) { return _xgetbv(xcr); }
#else
#include <cpuid.h>
#if !defined(__cpuid_count) // Old Mac Clang doesn't have this defined.
#define __cpuid_count(eax, ecx, a, b, c, d) \
__asm__("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(eax), "2"(ecx))
#endif
static void cpuid (uint32_t abcd[4]) { __get_cpuid(1, abcd+0, abcd+1, abcd+2, abcd+3); }
static void cpuid7(uint32_t abcd[4]) {
__cpuid_count(7, 0, abcd[0], abcd[1], abcd[2], abcd[3]);
}
static uint64_t xgetbv(uint32_t xcr) {
uint32_t eax, edx;
__asm__ __volatile__ ( "xgetbv" : "=a"(eax), "=d"(edx) : "c"(xcr));
return (uint64_t)(edx) << 32 | eax;
}
#endif
static uint32_t read_cpu_features() {
uint32_t features = 0;
uint32_t abcd[4] = {0,0,0,0};
// You might want to refer to http://www.sandpile.org/x86/cpuid.htm
cpuid(abcd);
if (abcd[3] & (1<<25)) { features |= SkCpu:: SSE1; }
if (abcd[3] & (1<<26)) { features |= SkCpu:: SSE2; }
if (abcd[2] & (1<< 0)) { features |= SkCpu:: SSE3; }
if (abcd[2] & (1<< 9)) { features |= SkCpu::SSSE3; }
if (abcd[2] & (1<<19)) { features |= SkCpu::SSE41; }
if (abcd[2] & (1<<20)) { features |= SkCpu::SSE42; }
if ((abcd[2] & (3<<26)) == (3<<26) && (xgetbv(0) & 6) == 6) { // XSAVE + OSXSAVE
if (abcd[2] & (1<<28)) { features |= SkCpu:: AVX; }
if (abcd[2] & (1<<29)) { features |= SkCpu::F16C; }
if (abcd[2] & (1<<12)) { features |= SkCpu:: FMA; }
cpuid7(abcd);
if (abcd[1] & (1<<5)) { features |= SkCpu::AVX2; }
}
return features;
}
#elif defined(SK_CPU_ARM32) && \
defined(SK_BUILD_FOR_ANDROID) && \
!defined(SK_BUILD_FOR_ANDROID_FRAMEWORK)
#include <cpu-features.h>
static uint32_t read_cpu_features() {
uint32_t features = 0;
uint64_t android_features = android_getCpuFeatures();
if (android_features & ANDROID_CPU_ARM_FEATURE_NEON ) { features |= SkCpu::NEON ; }
if (android_features & ANDROID_CPU_ARM_FEATURE_NEON_FMA) { features |= SkCpu::NEON_FMA; }
if (android_features & ANDROID_CPU_ARM_FEATURE_VFP_FP16) { features |= SkCpu::VFP_FP16; }
return features;
}
#else
static uint32_t read_cpu_features() {
return 0;
}
#endif
#if defined(_MSC_VER)
const uint32_t SkCpu::gCachedFeatures = read_cpu_features();
void SkCpu::CacheRuntimeFeatures() {}
#else
uint32_t SkCpu::gCachedFeatures = 0;
void SkCpu::CacheRuntimeFeatures() {
static SkOnce once;
once([] { gCachedFeatures = read_cpu_features(); });
}
#endif
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