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cpuinfo: more work on SDL_HasNEON().
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@ -50,13 +50,7 @@
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#include <setjmp.h>
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#endif
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#if 0 /* !!! FIXME */
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#if defined(__ANDROID__) && defined(__ARM_ARCH)
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#include <cpu-features.h>
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#endif
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#endif
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#if defined(__LINUX__) && defined(__ARM_ARCH) && HAVE_GETAUXVAL
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#if defined(__LINUX__) && defined(__ARM_ARCH)
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#include <sys/auxv.h>
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#include <asm/hwcap.h>
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#endif
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@ -300,38 +294,61 @@ CPU_haveAltiVec(void)
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return altivec;
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}
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#if (defined(__LINUX__) || defined(__ANDROID__)) && !HAVE_GETAUXVAL
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static int
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readProcAuxvForNeon(void)
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{
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int neon = 0;
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int kv[2];
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const int fd = open("/proc/self/auxv", O_RDONLY);
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if (fd == -1) {
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return 0;
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}
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while (read(fd, kv, sizeof (kv)) == sizeof (kv)) {
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if (kv[0] == AT_HWCAP) {
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neon = ((kv[1] & HWCAP_NEON) == HWCAP_NEON);
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break;
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}
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}
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close(fd);
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return neon;
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}
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#endif
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static int
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CPU_haveNEON(void)
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{
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int neon = 0;
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/* The way you detect NEON is a privileged instruction on ARM, so you have
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query the OS kernel in a platform-specific way. :/ */
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#ifndef SDL_CPUINFO_DISABLED
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#if defined(__APPLE__) && defined(__ARM_ARCH)
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#if defined(SDL_CPUINFO_DISABLED) || !defined(__ARM_ARCH)
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return 0;
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#elif __ARM_ARCH >= 8
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return 1; // ARMv8 always has non-optional NEON support.
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#elif defined(__APPLE__)
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/* all hardware that runs iOS 5 and later support NEON, but check anyhow */
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int neon = 0;
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size_t length = sizeof (neon);
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const int error = sysctlbyname("hw.optional.neon", &neon, &length, NULL, 0);
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if (!error)
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neon = (neon != 0);
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#elif 0 && defined(__ANDROID__) && defined(__ARM_ARCH) /* !!! FIXME */
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if ( (android_getCpuFamily() == ANDROID_CPU_FAMILY_ARM) &&
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((android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0) ) {
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neon = 1;
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}
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#elif defined(__LINUX__) && defined(__ARM_ARCH) && HAVE_GETAUXVAL
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if (getauxval(AT_HWCAP) & HWCAP_NEON) {
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neon = 1;
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}
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return (!error) && (neon != 0);
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/* Android offers a static library for this but all it does is parse /proc/cpuinfo */
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#elif (defined(__LINUX__) || defined(__ANDROID__)) && HAVE_GETAUXVAL
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return ((getauxval(AT_HWCAP) & HWCAP_NEON) == HWCAP_NEON)
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#elif (defined(__LINUX__) || defined(__ANDROID__))
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return readProcAuxvForNeon();
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#elif (defined(__WINDOWS__) || defined(__WINRT__)) && defined(_M_ARM)
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/* All WinRT ARM devices are required to support NEON, but just in case. */
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if (IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE)) {
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neon = 1;
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}
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#else
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#warning SDL_HasNEON is not implemented for this ARM platform. Write me.
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#endif
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#endif
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return neon;
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}
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static int
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