mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
191 lines
4.4 KiB
C
191 lines
4.4 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. 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 LICENSE 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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#include <stdlib.h>
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#include <string.h>
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#include "arm.h"
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static int arm_cpu_env_flags(int *flags)
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{
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char *env;
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env = getenv("VPX_SIMD_CAPS");
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if (env && *env)
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{
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*flags = (int)strtol(env, NULL, 0);
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return 0;
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}
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*flags = 0;
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return -1;
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}
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static int arm_cpu_env_mask(void)
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{
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char *env;
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env = getenv("VPX_SIMD_CAPS_MASK");
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return env && *env ? (int)strtol(env, NULL, 0) : ~0;
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}
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#if defined(_MSC_VER)
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/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/
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#define WIN32_LEAN_AND_MEAN
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#define WIN32_EXTRA_LEAN
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#include <windows.h>
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int arm_cpu_caps(void)
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{
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int flags;
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int mask;
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if (!arm_cpu_env_flags(&flags))
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{
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return flags;
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}
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mask = arm_cpu_env_mask();
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/* MSVC has no inline __asm support for ARM, but it does let you __emit
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* instructions via their assembled hex code.
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* All of these instructions should be essentially nops.
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*/
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#if defined(HAVE_ARMV5TE)
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if (mask & HAS_EDSP)
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{
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__try
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{
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/*PLD [r13]*/
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__emit(0xF5DDF000);
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flags |= HAS_EDSP;
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}
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__except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
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{
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/*Ignore exception.*/
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}
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}
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#if defined(HAVE_ARMV6)
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if (mask & HAS_MEDIA)
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__try
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{
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/*SHADD8 r3,r3,r3*/
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__emit(0xE6333F93);
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flags |= HAS_MEDIA;
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}
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__except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
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{
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/*Ignore exception.*/
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}
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}
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#if defined(HAVE_ARMV7)
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if (mask & HAS_NEON)
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{
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__try
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{
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/*VORR q0,q0,q0*/
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__emit(0xF2200150);
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flags |= HAS_NEON;
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}
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__except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
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{
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/*Ignore exception.*/
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}
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}
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#endif
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#endif
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#endif
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return flags & mask;
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}
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#elif defined(__linux__)
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#include <stdio.h>
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int arm_cpu_caps(void)
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{
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FILE *fin;
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int flags;
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int mask;
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if (!arm_cpu_env_flags(&flags))
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{
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return flags;
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}
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mask = arm_cpu_env_mask();
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/* Reading /proc/self/auxv would be easier, but that doesn't work reliably
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* on Android.
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* This also means that detection will fail in Scratchbox.
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*/
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fin = fopen("/proc/cpuinfo","r");
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if(fin != NULL)
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{
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/* 512 should be enough for anybody (it's even enough for all the flags
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* that x86 has accumulated... so far).
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*/
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char buf[512];
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while (fgets(buf, 511, fin) != NULL)
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{
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#if defined(HAVE_ARMV5TE) || defined(HAVE_ARMV7)
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if (memcmp(buf, "Features", 8) == 0)
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{
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char *p;
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#if defined(HAVE_ARMV5TE)
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p=strstr(buf, " edsp");
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if (p != NULL && (p[5] == ' ' || p[5] == '\n'))
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{
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flags |= HAS_EDSP;
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}
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#if defined(HAVE_ARMV7)
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p = strstr(buf, " neon");
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if (p != NULL && (p[5] == ' ' || p[5] == '\n'))
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{
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flags |= HAS_NEON;
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}
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#endif
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#endif
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}
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#endif
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#if defined(HAVE_ARMV6)
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if (memcmp(buf, "CPU architecture:",17) == 0){
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int version;
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version = atoi(buf+17);
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if (version >= 6)
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{
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flags |= HAS_MEDIA;
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}
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}
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#endif
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}
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fclose(fin);
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}
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return flags & mask;
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}
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#elif !CONFIG_RUNTIME_CPU_DETECT
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int arm_cpu_caps(void)
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{
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int flags;
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int mask;
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if (!arm_cpu_env_flags(&flags))
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{
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return flags;
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}
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mask = arm_cpu_env_mask();
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#if defined(HAVE_ARMV5TE)
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flags |= HAS_EDSP;
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#endif
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#if defined(HAVE_ARMV6)
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flags |= HAS_MEDIA;
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#endif
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#if defined(HAVE_ARMV7)
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flags |= HAS_NEON;
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#endif
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return flags & mask;
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}
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#else
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#error "--enable-runtime-cpu-detect selected, but no CPU detection method " \
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"available for your platform. Reconfigure without --enable-runtime-cpu-detect."
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#endif
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