223 lines
6.9 KiB
C
223 lines
6.9 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// CPU detection
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//
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// Author: Christian Duvivier (cduvivier@google.com)
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#include "./dsp.h"
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#if defined(WEBP_HAVE_NEON_RTCD)
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#include <stdio.h>
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#include <string.h>
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#endif
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#if defined(WEBP_ANDROID_NEON)
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#include <cpu-features.h>
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#endif
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//------------------------------------------------------------------------------
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// SSE2 detection.
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//
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// apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC.
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#if (defined(__pic__) || defined(__PIC__)) && defined(__i386__)
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static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
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__asm__ volatile (
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"mov %%ebx, %%edi\n"
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"cpuid\n"
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"xchg %%edi, %%ebx\n"
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: "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
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: "a"(info_type), "c"(0));
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}
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#elif defined(__x86_64__) && \
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(defined(__code_model_medium__) || defined(__code_model_large__)) && \
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defined(__PIC__)
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static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
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__asm__ volatile (
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"xchg{q}\t{%%rbx}, %q1\n"
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"cpuid\n"
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"xchg{q}\t{%%rbx}, %q1\n"
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: "=a"(cpu_info[0]), "=&r"(cpu_info[1]), "=c"(cpu_info[2]),
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"=d"(cpu_info[3])
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: "a"(info_type), "c"(0));
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}
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#elif defined(__i386__) || defined(__x86_64__)
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static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
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__asm__ volatile (
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"cpuid\n"
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: "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
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: "a"(info_type), "c"(0));
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}
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#elif (defined(_M_X64) || defined(_M_IX86)) && \
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defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 150030729 // >= VS2008 SP1
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#include <intrin.h>
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#define GetCPUInfo(info, type) __cpuidex(info, type, 0) // set ecx=0
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#elif defined(WEBP_MSC_SSE2)
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#define GetCPUInfo __cpuid
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#endif
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// NaCl has no support for xgetbv or the raw opcode.
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#if !defined(__native_client__) && (defined(__i386__) || defined(__x86_64__))
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static WEBP_INLINE uint64_t xgetbv(void) {
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const uint32_t ecx = 0;
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uint32_t eax, edx;
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// Use the raw opcode for xgetbv for compatibility with older toolchains.
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__asm__ volatile (
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".byte 0x0f, 0x01, 0xd0\n"
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: "=a"(eax), "=d"(edx) : "c" (ecx));
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return ((uint64_t)edx << 32) | eax;
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}
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#elif (defined(_M_X64) || defined(_M_IX86)) && \
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defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 160040219 // >= VS2010 SP1
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#include <immintrin.h>
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#define xgetbv() _xgetbv(0)
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#elif defined(_MSC_VER) && defined(_M_IX86)
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static WEBP_INLINE uint64_t xgetbv(void) {
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uint32_t eax_, edx_;
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__asm {
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xor ecx, ecx // ecx = 0
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// Use the raw opcode for xgetbv for compatibility with older toolchains.
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__asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0
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mov eax_, eax
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mov edx_, edx
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}
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return ((uint64_t)edx_ << 32) | eax_;
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}
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#else
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#define xgetbv() 0U // no AVX for older x64 or unrecognized toolchains.
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#endif
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#if defined(__i386__) || defined(__x86_64__) || defined(WEBP_MSC_SSE2)
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// helper function for run-time detection of slow SSSE3 platforms
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static int CheckSlowModel(int info) {
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// Table listing display models with longer latencies for the bsr instruction
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// (ie 2 cycles vs 10/16 cycles) and some SSSE3 instructions like pshufb.
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// Refer to Intel 64 and IA-32 Architectures Optimization Reference Manual.
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static const uint8_t kSlowModels[] = {
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0x37, 0x4a, 0x4d, // Silvermont Microarchitecture
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0x1c, 0x26, 0x27 // Atom Microarchitecture
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};
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const uint32_t model = ((info & 0xf0000) >> 12) | ((info >> 4) & 0xf);
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const uint32_t family = (info >> 8) & 0xf;
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if (family == 0x06) {
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size_t i;
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for (i = 0; i < sizeof(kSlowModels) / sizeof(kSlowModels[0]); ++i) {
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if (model == kSlowModels[i]) return 1;
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}
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}
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return 0;
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}
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static int x86CPUInfo(CPUFeature feature) {
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int max_cpuid_value;
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int cpu_info[4];
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int is_intel = 0;
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// get the highest feature value cpuid supports
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GetCPUInfo(cpu_info, 0);
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max_cpuid_value = cpu_info[0];
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if (max_cpuid_value < 1) {
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return 0;
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} else {
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const int VENDOR_ID_INTEL_EBX = 0x756e6547; // uneG
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const int VENDOR_ID_INTEL_EDX = 0x49656e69; // Ieni
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const int VENDOR_ID_INTEL_ECX = 0x6c65746e; // letn
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is_intel = (cpu_info[1] == VENDOR_ID_INTEL_EBX &&
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cpu_info[2] == VENDOR_ID_INTEL_ECX &&
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cpu_info[3] == VENDOR_ID_INTEL_EDX); // genuine Intel?
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}
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GetCPUInfo(cpu_info, 1);
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if (feature == kSSE2) {
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return !!(cpu_info[3] & (1 << 26));
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}
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if (feature == kSSE3) {
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return !!(cpu_info[2] & (1 << 0));
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}
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if (feature == kSlowSSSE3) {
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if (is_intel && (cpu_info[2] & (1 << 0))) { // SSSE3?
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return CheckSlowModel(cpu_info[0]);
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}
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return 0;
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}
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if (feature == kSSE4_1) {
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return !!(cpu_info[2] & (1 << 19));
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}
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if (feature == kAVX) {
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// bits 27 (OSXSAVE) & 28 (256-bit AVX)
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if ((cpu_info[2] & 0x18000000) == 0x18000000) {
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// XMM state and YMM state enabled by the OS.
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return (xgetbv() & 0x6) == 0x6;
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}
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}
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if (feature == kAVX2) {
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if (x86CPUInfo(kAVX) && max_cpuid_value >= 7) {
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GetCPUInfo(cpu_info, 7);
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return !!(cpu_info[1] & (1 << 5));
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}
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}
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return 0;
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}
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VP8CPUInfo VP8GetCPUInfo = x86CPUInfo;
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#elif defined(WEBP_ANDROID_NEON) // NB: needs to be before generic NEON test.
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static int AndroidCPUInfo(CPUFeature feature) {
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const AndroidCpuFamily cpu_family = android_getCpuFamily();
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const uint64_t cpu_features = android_getCpuFeatures();
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if (feature == kNEON) {
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return (cpu_family == ANDROID_CPU_FAMILY_ARM &&
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0 != (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON));
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}
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return 0;
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}
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VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
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#elif defined(WEBP_USE_NEON)
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// define a dummy function to enable turning off NEON at runtime by setting
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// VP8DecGetCPUInfo = NULL
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static int armCPUInfo(CPUFeature feature) {
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if (feature != kNEON) return 0;
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#if defined(__linux__) && defined(WEBP_HAVE_NEON_RTCD)
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{
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int has_neon = 0;
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char line[200];
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FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
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if (cpuinfo == NULL) return 0;
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while (fgets(line, sizeof(line), cpuinfo)) {
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if (!strncmp(line, "Features", 8)) {
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if (strstr(line, " neon ") != NULL) {
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has_neon = 1;
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break;
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}
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}
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}
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fclose(cpuinfo);
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return has_neon;
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}
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#else
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return 1;
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#endif
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}
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VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
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#elif defined(WEBP_USE_MIPS32) || defined(WEBP_USE_MIPS_DSP_R2) || \
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defined(WEBP_USE_MSA)
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static int mipsCPUInfo(CPUFeature feature) {
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if ((feature == kMIPS32) || (feature == kMIPSdspR2) || (feature == kMSA)) {
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return 1;
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} else {
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return 0;
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}
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}
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VP8CPUInfo VP8GetCPUInfo = mipsCPUInfo;
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#else
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VP8CPUInfo VP8GetCPUInfo = NULL;
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#endif
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