+ /*
+ * On Android, the cpufeatures library is preferred way of checking
+ * CPU capabilities. However, it is not available for standalone Mesa
+ * builds, i.e. when Android build system (Android.mk-based) is not
+ * used. Because of this we cannot use PIPE_OS_ANDROID here, but rather
+ * have a separate macro that only gets enabled from respective Android.mk.
+ */
+#if defined(HAS_ANDROID_CPUFEATURES)
+ AndroidCpuFamily cpu_family = android_getCpuFamily();
+ uint64_t cpu_features = android_getCpuFeatures();
+
+ if (cpu_family == ANDROID_CPU_FAMILY_ARM) {
+ if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON)
+ util_cpu_caps.has_neon = 1;
+ }
+#elif defined(PIPE_OS_LINUX)
+ Elf32_auxv_t aux;
+ int fd;
+
+ fd = open("/proc/self/auxv", O_RDONLY | O_CLOEXEC);
+ if (fd >= 0) {
+ while (read(fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t)) {
+ if (aux.a_type == AT_HWCAP) {
+ uint32_t hwcap = aux.a_un.a_val;
+
+ util_cpu_caps.has_neon = (hwcap >> 12) & 1;
+ break;
+ }
+ }
+ close (fd);
+ }
+#endif /* PIPE_OS_LINUX */
+}
+#endif /* PIPE_ARCH_ARM */