vpx/vpx_ports/arm_cpudetect.c
Johann 8bb82fded5 Upstream build bug for chromium
https://codereview.chromium.org/11413061/

The Android NDK automatically manages the include directories. Trying
to do so manually for the Android GYP files can cause the wrong setjmp.h
to be included.

Change-Id: I5c3769f983fcbad1ed602feda781690c6e4e97b3
2012-11-19 12:47:27 -08:00

224 lines
5.3 KiB
C

/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE 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.
*/
#include <stdlib.h>
#include <string.h>
#include "arm.h"
static int arm_cpu_env_flags(int *flags)
{
char *env;
env = getenv("VPX_SIMD_CAPS");
if (env && *env)
{
*flags = (int)strtol(env, NULL, 0);
return 0;
}
*flags = 0;
return -1;
}
static int arm_cpu_env_mask(void)
{
char *env;
env = getenv("VPX_SIMD_CAPS_MASK");
return env && *env ? (int)strtol(env, NULL, 0) : ~0;
}
#if !CONFIG_RUNTIME_CPU_DETECT
int arm_cpu_caps(void)
{
/* This function should actually be a no-op. There is no way to adjust any of
* these because the RTCD tables do not exist: the functions are called
* statically */
int flags;
int mask;
if (!arm_cpu_env_flags(&flags))
{
return flags;
}
mask = arm_cpu_env_mask();
#if HAVE_EDSP
flags |= HAS_EDSP;
#endif /* HAVE_EDSP */
#if HAVE_MEDIA
flags |= HAS_MEDIA;
#endif /* HAVE_MEDIA */
#if HAVE_NEON
flags |= HAS_NEON;
#endif /* HAVE_NEON */
return flags & mask;
}
#elif defined(_MSC_VER) /* end !CONFIG_RUNTIME_CPU_DETECT */
/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/
#define WIN32_LEAN_AND_MEAN
#define WIN32_EXTRA_LEAN
#include <windows.h>
int arm_cpu_caps(void)
{
int flags;
int mask;
if (!arm_cpu_env_flags(&flags))
{
return flags;
}
mask = arm_cpu_env_mask();
/* MSVC has no inline __asm support for ARM, but it does let you __emit
* instructions via their assembled hex code.
* All of these instructions should be essentially nops.
*/
#if HAVE_EDSP
if (mask & HAS_EDSP)
{
__try
{
/*PLD [r13]*/
__emit(0xF5DDF000);
flags |= HAS_EDSP;
}
__except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
{
/*Ignore exception.*/
}
}
#if HAVE_MEDIA
if (mask & HAS_MEDIA)
__try
{
/*SHADD8 r3,r3,r3*/
__emit(0xE6333F93);
flags |= HAS_MEDIA;
}
__except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
{
/*Ignore exception.*/
}
}
#if HAVE_NEON
if (mask & HAS_NEON)
{
__try
{
/*VORR q0,q0,q0*/
__emit(0xF2200150);
flags |= HAS_NEON;
}
__except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
{
/*Ignore exception.*/
}
}
#endif /* HAVE_NEON */
#endif /* HAVE_MEDIA */
#endif /* HAVE_EDSP */
return flags & mask;
}
#elif defined(__ANDROID__) /* end _MSC_VER */
#if defined(CHROMIUM_BUILD)
#include <machine/cpu-features.h>
#else
#include <cpu-features.h>
#endif
int arm_cpu_caps(void)
{
int flags;
int mask;
uint64_t features;
if (!arm_cpu_env_flags(&flags))
{
return flags;
}
mask = arm_cpu_env_mask();
features = android_getCpuFeatures();
#if HAVE_EDSP
flags |= HAS_EDSP;
#endif /* HAVE_EDSP */
#if HAVE_MEDIA
flags |= HAS_MEDIA;
#endif /* HAVE_MEDIA */
#if HAVE_NEON
if (features & ANDROID_CPU_ARM_FEATURE_NEON)
flags |= HAS_NEON;
#endif /* HAVE_NEON */
return flags & mask;
}
#elif defined(__linux__) /* end __ANDROID__ */
#include <stdio.h>
int arm_cpu_caps(void)
{
FILE *fin;
int flags;
int mask;
if (!arm_cpu_env_flags(&flags))
{
return flags;
}
mask = arm_cpu_env_mask();
/* Reading /proc/self/auxv would be easier, but that doesn't work reliably
* on Android.
* This also means that detection will fail in Scratchbox.
*/
fin = fopen("/proc/cpuinfo","r");
if(fin != NULL)
{
/* 512 should be enough for anybody (it's even enough for all the flags
* that x86 has accumulated... so far).
*/
char buf[512];
while (fgets(buf, 511, fin) != NULL)
{
#if HAVE_EDSP || HAVE_NEON
if (memcmp(buf, "Features", 8) == 0)
{
char *p;
#if HAVE_EDSP
p=strstr(buf, " edsp");
if (p != NULL && (p[5] == ' ' || p[5] == '\n'))
{
flags |= HAS_EDSP;
}
#if HAVE_NEON
p = strstr(buf, " neon");
if (p != NULL && (p[5] == ' ' || p[5] == '\n'))
{
flags |= HAS_NEON;
}
#endif /* HAVE_NEON */
#endif /* HAVE_EDSP */
}
#endif /* HAVE_EDSP || HAVE_NEON */
#if HAVE_MEDIA
if (memcmp(buf, "CPU architecture:",17) == 0){
int version;
version = atoi(buf+17);
if (version >= 6)
{
flags |= HAS_MEDIA;
}
}
#endif /* HAVE_MEDIA */
}
fclose(fin);
}
return flags & mask;
}
#else /* end __linux__ */
#error "--enable-runtime-cpu-detect selected, but no CPU detection method " \
"available for your platform. Reconfigure with --disable-runtime-cpu-detect."
#endif