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cpuinfo: Patched to compile on Android, Linux.

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This commit is contained in:
Ryan C. Gordon 2016-11-17 16:04:00 -05:00
parent e8f4b7c4f5
commit a298e56349
1 changed files with 13 additions and 18 deletions
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21
src/cpuinfo/SDL_cpuinfo.c
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@ -50,10 +50,11 @@
#include <setjmp.h> #include <setjmp.h>
#endif #endif
#if defined(__LINUX__) || defined(__ANDROID__) && defined(__ARM_ARCH) #if (defined(__LINUX__) || defined(__ANDROID__)) && defined(__ARM_ARCH)
#include <sys/auxv.h>
#include <asm/hwcap.h> #include <asm/hwcap.h>
#if !defined HAVE_GETAUXVAL #if defined HAVE_GETAUXVAL
#include <sys/auxv.h>
#else
#include <fcntl.h> #include <fcntl.h>
#endif #endif
#endif #endif
@ -297,27 +298,22 @@ CPU_haveAltiVec(void)
return altivec; return altivec;
} }
#if (defined(__LINUX__) || defined(__ANDROID__)) && !defined(HAVE_GETAUXVAL) #if (defined(__LINUX__) || defined(__ANDROID__)) && defined(__ARM_ARCH) && !defined(HAVE_GETAUXVAL)
static int static int
readProcAuxvForNeon(void) readProcAuxvForNeon(void)
{ {
int neon = 0; int neon = 0;
int kv[2]; int kv[2];
const int fd = open("/proc/self/auxv", O_RDONLY); const int fd = open("/proc/self/auxv", O_RDONLY);
if (fd != -1) {
if (fd == -1) {
return 0;
}
while (read(fd, kv, sizeof (kv)) == sizeof (kv)) { while (read(fd, kv, sizeof (kv)) == sizeof (kv)) {
if (kv[0] == AT_HWCAP) { if (kv[0] == AT_HWCAP) {
neon = ((kv[1] & HWCAP_NEON) == HWCAP_NEON); neon = ((kv[1] & HWCAP_NEON) == HWCAP_NEON);
break; break;
} }
} }
close(fd); close(fd);
}
return neon; return neon;
} }
#endif #endif
@ -338,11 +334,10 @@ CPU_haveNEON(void)
size_t length = sizeof (neon); size_t length = sizeof (neon);
const int error = sysctlbyname("hw.optional.neon", &neon, &length, NULL, 0); const int error = sysctlbyname("hw.optional.neon", &neon, &length, NULL, 0);
return (!error) && (neon != 0); return (!error) && (neon != 0);
/* Android offers a static library for this but all it does is parse /proc/cpuinfo */
#elif (defined(__LINUX__) || defined(__ANDROID__)) && defined(HAVE_GETAUXVAL) #elif (defined(__LINUX__) || defined(__ANDROID__)) && defined(HAVE_GETAUXVAL)
return ((getauxval(AT_HWCAP) & HWCAP_NEON) == HWCAP_NEON) return ((getauxval(AT_HWCAP) & HWCAP_NEON) == HWCAP_NEON)
#elif (defined(__LINUX__) || defined(__ANDROID__)) #elif (defined(__LINUX__) || defined(__ANDROID__))
return readProcAuxvForNeon(); return readProcAuxvForNeon(); /* Android offers a static library for this, but it just parses /proc/self/auxv */
#elif (defined(__WINDOWS__) || defined(__WINRT__)) && defined(_M_ARM) #elif (defined(__WINDOWS__) || defined(__WINRT__)) && defined(_M_ARM)
/* All WinRT ARM devices are required to support NEON, but just in case. */ /* All WinRT ARM devices are required to support NEON, but just in case. */
return IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != 0; return IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != 0;