1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/cairo/libpixman/src/pixman-arm.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,229 @@
1.4 +/*
1.5 + * Copyright © 2000 SuSE, Inc.
1.6 + * Copyright © 2007 Red Hat, Inc.
1.7 + *
1.8 + * Permission to use, copy, modify, distribute, and sell this software and its
1.9 + * documentation for any purpose is hereby granted without fee, provided that
1.10 + * the above copyright notice appear in all copies and that both that
1.11 + * copyright notice and this permission notice appear in supporting
1.12 + * documentation, and that the name of SuSE not be used in advertising or
1.13 + * publicity pertaining to distribution of the software without specific,
1.14 + * written prior permission. SuSE makes no representations about the
1.15 + * suitability of this software for any purpose. It is provided "as is"
1.16 + * without express or implied warranty.
1.17 + *
1.18 + * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
1.19 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
1.20 + * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
1.21 + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
1.22 + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
1.23 + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.24 + */
1.25 +#ifdef HAVE_CONFIG_H
1.26 +#include <config.h>
1.27 +#endif
1.28 +
1.29 +#include "pixman-private.h"
1.30 +
1.31 +typedef enum
1.32 +{
1.33 + ARM_V7 = (1 << 0),
1.34 + ARM_V6 = (1 << 1),
1.35 + ARM_VFP = (1 << 2),
1.36 + ARM_NEON = (1 << 3),
1.37 + ARM_IWMMXT = (1 << 4)
1.38 +} arm_cpu_features_t;
1.39 +
1.40 +#if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON) || defined(USE_ARM_IWMMXT)
1.41 +
1.42 +#if defined(_MSC_VER)
1.43 +
1.44 +/* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */
1.45 +#include <windows.h>
1.46 +
1.47 +extern int pixman_msvc_try_arm_neon_op ();
1.48 +extern int pixman_msvc_try_arm_simd_op ();
1.49 +
1.50 +static arm_cpu_features_t
1.51 +detect_cpu_features (void)
1.52 +{
1.53 + arm_cpu_features_t features = 0;
1.54 +
1.55 + __try
1.56 + {
1.57 + pixman_msvc_try_arm_simd_op ();
1.58 + features |= ARM_V6;
1.59 + }
1.60 + __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
1.61 + {
1.62 + }
1.63 +
1.64 + __try
1.65 + {
1.66 + pixman_msvc_try_arm_neon_op ();
1.67 + features |= ARM_NEON;
1.68 + }
1.69 + __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
1.70 + {
1.71 + }
1.72 +
1.73 + return features;
1.74 +}
1.75 +
1.76 +#elif defined(__APPLE__) && defined(TARGET_OS_IPHONE) /* iOS */
1.77 +
1.78 +#include "TargetConditionals.h"
1.79 +
1.80 +static arm_cpu_features_t
1.81 +detect_cpu_features (void)
1.82 +{
1.83 + arm_cpu_features_t features = 0;
1.84 +
1.85 + features |= ARM_V6;
1.86 +
1.87 + /* Detection of ARM NEON on iOS is fairly simple because iOS binaries
1.88 + * contain separate executable images for each processor architecture.
1.89 + * So all we have to do is detect the armv7 architecture build. The
1.90 + * operating system automatically runs the armv7 binary for armv7 devices
1.91 + * and the armv6 binary for armv6 devices.
1.92 + */
1.93 +#if defined(__ARM_NEON__)
1.94 + features |= ARM_NEON;
1.95 +#endif
1.96 +
1.97 + return features;
1.98 +}
1.99 +
1.100 +#elif defined(__ANDROID__) || defined(ANDROID) /* Android */
1.101 +
1.102 +static arm_cpu_features_t
1.103 +detect_cpu_features (void)
1.104 +{
1.105 + arm_cpu_features_t features = 0;
1.106 + char buf[1024];
1.107 + char* pos;
1.108 + const char* ver_token = "CPU architecture: ";
1.109 + FILE* f = fopen("/proc/cpuinfo", "r");
1.110 + if (!f) {
1.111 + return features;
1.112 + }
1.113 +
1.114 + fread(buf, sizeof(char), sizeof(buf), f);
1.115 + fclose(f);
1.116 + pos = strstr(buf, ver_token);
1.117 + if (pos) {
1.118 + char vchar = *(pos + strlen(ver_token));
1.119 + if (vchar >= '0' && vchar <= '9') {
1.120 + int ver = vchar - '0';
1.121 + if (ver >= 7)
1.122 + features |= ARM_V7;
1.123 + }
1.124 + }
1.125 + if (strstr(buf, "neon") != NULL)
1.126 + features |= ARM_NEON;
1.127 + if (strstr(buf, "vfp") != NULL)
1.128 + features |= ARM_VFP;
1.129 +
1.130 + return features;
1.131 +}
1.132 +
1.133 +#elif defined (__linux__) /* linux ELF */
1.134 +
1.135 +#include <unistd.h>
1.136 +#include <sys/types.h>
1.137 +#include <sys/stat.h>
1.138 +#include <sys/mman.h>
1.139 +#include <fcntl.h>
1.140 +#include <string.h>
1.141 +#include <elf.h>
1.142 +
1.143 +static arm_cpu_features_t
1.144 +detect_cpu_features (void)
1.145 +{
1.146 + arm_cpu_features_t features = 0;
1.147 + Elf32_auxv_t aux;
1.148 + int fd;
1.149 +
1.150 + fd = open ("/proc/self/auxv", O_RDONLY);
1.151 + if (fd >= 0)
1.152 + {
1.153 + while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
1.154 + {
1.155 + if (aux.a_type == AT_HWCAP)
1.156 + {
1.157 + uint32_t hwcap = aux.a_un.a_val;
1.158 +
1.159 + /* hardcode these values to avoid depending on specific
1.160 + * versions of the hwcap header, e.g. HWCAP_NEON
1.161 + */
1.162 + if ((hwcap & 64) != 0)
1.163 + features |= ARM_VFP;
1.164 + if ((hwcap & 512) != 0)
1.165 + features |= ARM_IWMMXT;
1.166 + /* this flag is only present on kernel 2.6.29 */
1.167 + if ((hwcap & 4096) != 0)
1.168 + features |= ARM_NEON;
1.169 + }
1.170 + else if (aux.a_type == AT_PLATFORM)
1.171 + {
1.172 + const char *plat = (const char*) aux.a_un.a_val;
1.173 +
1.174 + if (strncmp (plat, "v7l", 3) == 0)
1.175 + features |= (ARM_V7 | ARM_V6);
1.176 + else if (strncmp (plat, "v6l", 3) == 0)
1.177 + features |= ARM_V6;
1.178 + }
1.179 + }
1.180 + close (fd);
1.181 + }
1.182 +
1.183 + return features;
1.184 +}
1.185 +
1.186 +#else /* Unknown */
1.187 +
1.188 +static arm_cpu_features_t
1.189 +detect_cpu_features (void)
1.190 +{
1.191 + return 0;
1.192 +}
1.193 +
1.194 +#endif /* Linux elf */
1.195 +
1.196 +static pixman_bool_t
1.197 +have_feature (arm_cpu_features_t feature)
1.198 +{
1.199 + static pixman_bool_t initialized;
1.200 + static arm_cpu_features_t features;
1.201 +
1.202 + if (!initialized)
1.203 + {
1.204 + features = detect_cpu_features();
1.205 + initialized = TRUE;
1.206 + }
1.207 +
1.208 + return (features & feature) == feature;
1.209 +}
1.210 +
1.211 +#endif /* USE_ARM_SIMD || USE_ARM_NEON || USE_ARM_IWMMXT */
1.212 +
1.213 +pixman_implementation_t *
1.214 +_pixman_arm_get_implementations (pixman_implementation_t *imp)
1.215 +{
1.216 +#ifdef USE_ARM_SIMD
1.217 + if (!_pixman_disabled ("arm-simd") && have_feature (ARM_V6))
1.218 + imp = _pixman_implementation_create_arm_simd (imp);
1.219 +#endif
1.220 +
1.221 +#ifdef USE_ARM_IWMMXT
1.222 + if (!_pixman_disabled ("arm-iwmmxt") && have_feature (ARM_IWMMXT))
1.223 + imp = _pixman_implementation_create_mmx (imp);
1.224 +#endif
1.225 +
1.226 +#ifdef USE_ARM_NEON
1.227 + if (!_pixman_disabled ("arm-neon") && have_feature (ARM_NEON))
1.228 + imp = _pixman_implementation_create_arm_neon (imp);
1.229 +#endif
1.230 +
1.231 + return imp;
1.232 +}
