2014-01-16 21:55:06 +00:00
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--- third_party/webrtc/system_wrappers/source/cpu_features.cc.orig 2014-01-15 18:38:50.331954791 -0700
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+++ third_party/webrtc/system_wrappers/source/cpu_features.cc 2014-01-15 18:38:37.902004379 -0700
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2013-06-21 16:51:19 +00:00
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@@ -18,6 +18,47 @@
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2014-01-16 21:55:06 +00:00
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#include "webrtc/typedefs.h"
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2013-06-21 16:51:19 +00:00
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+#include <elf.h>
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+#ifdef __arm__
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+#include <fcntl.h>
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+#include <unistd.h>
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+#include <linux/auxvec.h>
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+#include <asm/hwcap.h>
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+#endif
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+
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+#ifdef __arm__
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+uint64_t WebRtc_GetCPUFeaturesARM() {
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+ static bool detected = false;
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+ static uint64_t have_neon = 0;
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+
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+ int fd;
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+ Elf32_auxv_t auxv;
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+ unsigned int hwcaps;
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+
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+ if (!detected) {
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+ int fd;
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+ Elf32_auxv_t auxv;
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+ unsigned int hwcaps;
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+
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+ fd = open("/proc/self/auxv", O_RDONLY);
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+ if (fd >= 0) {
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+ while (read(fd, &auxv, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t)) {
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+ if (auxv.a_type == AT_HWCAP) {
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+ have_neon = (auxv.a_un.a_val & HWCAP_NEON) ? kCPUFeatureNEON : 0;
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+ break;
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+ }
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+ }
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+ close (fd);
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+ } else {
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+ have_neon = 0;
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+ }
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+ detected = true;
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+ }
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+
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+ return 0 | have_neon; // others here as we need them
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+}
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+#endif
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+
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// No CPU feature is available => straight C path.
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int GetCPUInfoNoASM(CPUFeature feature) {
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(void)feature;
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