godot/thirdparty/libwebp/src/dsp/cpu.c

// Copyright 2011 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// CPU detection
//
// Author: Christian Duvivier ([email protected])

#include "src/dsp/cpu.h"

#if defined(WEBP_HAVE_NEON_RTCD)
#include <stdio.h>
#include <string.h>
#endif

#if defined(WEBP_ANDROID_NEON)
#include <cpu-features.h>
#endif

//------------------------------------------------------------------------------
// SSE2 detection.
//

// apple/darwin gcc-4.0.1 defines __PIC__, but not __pic__ with -fPIC.
#if (defined(__pic__) || defined(__PIC__)) && defined(__i386__)
static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
  __asm__ volatile (
    "mov %%ebx, %%edi\n"
    "cpuid\n"
    "xchg %%edi, %%ebx\n"
    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
    : "a"(info_type), "c"(0));
}
#elif defined(__i386__) || defined(__x86_64__)
static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) { … }
#elif defined(_MSC_VER) && (defined(_M_X64) || defined(_M_IX86))

#if defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 150030729  // >= VS2008 SP1
#include <intrin.h>
#define GetCPUInfo …
#define WEBP_HAVE_MSC_CPUID
#elif _MSC_VER > 1310
#include <intrin.h>
#define GetCPUInfo …
#define WEBP_HAVE_MSC_CPUID
#endif

#endif

// NaCl has no support for xgetbv or the raw opcode.
#if !defined(__native_client__) && (defined(__i386__) || defined(__x86_64__))
static WEBP_INLINE uint64_t xgetbv(void) { … }
#elif (defined(_M_X64) || defined(_M_IX86)) && \
      defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 160040219  // >= VS2010 SP1
#include <immintrin.h>
#define xgetbv …
#elif defined(_MSC_VER) && defined(_M_IX86)
static WEBP_INLINE uint64_t xgetbv(void) {
  uint32_t eax_, edx_;
  __asm {
    xor ecx, ecx  // ecx = 0
    // Use the raw opcode for xgetbv for compatibility with older toolchains.
    __asm _emit 0x0f __asm _emit 0x01 __asm _emit 0xd0
    mov eax_, eax
    mov edx_, edx
  }
  return ((uint64_t)edx_ << 32) | eax_;
}
#else
#define xgetbv …
#endif

#if defined(__i386__) || defined(__x86_64__) || defined(WEBP_HAVE_MSC_CPUID)

// helper function for run-time detection of slow SSSE3 platforms
static int CheckSlowModel(int info) { … }

static int x86CPUInfo(CPUFeature feature) { … }
WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
VP8CPUInfo VP8GetCPUInfo = …;
#elif defined(WEBP_ANDROID_NEON)  // NB: needs to be before generic NEON test.
static int AndroidCPUInfo(CPUFeature feature) {
  const AndroidCpuFamily cpu_family = android_getCpuFamily();
  const uint64_t cpu_features = android_getCpuFeatures();
  if (feature == kNEON) {
    return cpu_family == ANDROID_CPU_FAMILY_ARM &&
           (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
  }
  return 0;
}
WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
VP8CPUInfo VP8GetCPUInfo = AndroidCPUInfo;
#elif defined(EMSCRIPTEN) // also needs to be before generic NEON test
// Use compile flags as an indicator of SIMD support instead of a runtime check.
static int wasmCPUInfo(CPUFeature feature) {
  switch (feature) {
#ifdef WEBP_HAVE_SSE2
    case kSSE2:
      return 1;
#endif
#ifdef WEBP_HAVE_SSE41
    case kSSE3:
    case kSlowSSSE3:
    case kSSE4_1:
      return 1;
#endif
#ifdef WEBP_HAVE_NEON
    case kNEON:
      return 1;
#endif
    default:
      break;
  }
  return 0;
}
WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
VP8CPUInfo VP8GetCPUInfo = wasmCPUInfo;
#elif defined(WEBP_HAVE_NEON)
// In most cases this function doesn't check for NEON support (it's assumed by
// the configuration), but enables turning off NEON at runtime, for testing
// purposes, by setting VP8GetCPUInfo = NULL.
static int armCPUInfo(CPUFeature feature) {
  if (feature != kNEON) return 0;
#if defined(__linux__) && defined(WEBP_HAVE_NEON_RTCD)
  {
    int has_neon = 0;
    char line[200];
    FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
    if (cpuinfo == NULL) return 0;
    while (fgets(line, sizeof(line), cpuinfo)) {
      if (!strncmp(line, "Features", 8)) {
        if (strstr(line, " neon ") != NULL) {
          has_neon = 1;
          break;
        }
      }
    }
    fclose(cpuinfo);
    return has_neon;
  }
#else
  return 1;
#endif
}
WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
VP8CPUInfo VP8GetCPUInfo = armCPUInfo;
#elif defined(WEBP_USE_MIPS32) || defined(WEBP_USE_MIPS_DSP_R2) || \
      defined(WEBP_USE_MSA)
static int mipsCPUInfo(CPUFeature feature) {
  if ((feature == kMIPS32) || (feature == kMIPSdspR2) || (feature == kMSA)) {
    return 1;
  } else {
    return 0;
  }

}
WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
VP8CPUInfo VP8GetCPUInfo = mipsCPUInfo;
#else
WEBP_EXTERN VP8CPUInfo VP8GetCPUInfo;
VP8CPUInfo VP8GetCPUInfo = NULL;
#endif