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Description: GYP assumes ARMv7 always wants NEON, even if compile flags disable.
Origin: http://code.google.com/p/chromium/issues/detail?id=154107
Author: Chad Miller <chad.miller@canonical.com>
Bug-Chromium: 154107
Bug-Ubuntu: 1084852
--- a/third_party/webrtc/system_wrappers/source/cpu_features.cc
+++ b/third_party/webrtc/system_wrappers/source/cpu_features.cc
@@ -18,6 +18,47 @@
#include "webrtc/typedefs.h"
+#include <elf.h>
+#ifdef __arm__
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/auxvec.h>
+#include <asm/hwcap.h>
+#endif
+
+#ifdef __arm__
+uint64_t WebRtc_GetCPUFeaturesARM() {
+ static bool detected = false;
+ static uint64_t have_neon = 0;
+
+ int fd;
+ Elf32_auxv_t auxv;
+ unsigned int hwcaps;
+
+ if (!detected) {
+ int fd;
+ Elf32_auxv_t auxv;
+ unsigned int hwcaps;
+
+ fd = open("/proc/self/auxv", O_RDONLY);
+ if (fd >= 0) {
+ while (read(fd, &auxv, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t)) {
+ if (auxv.a_type == AT_HWCAP) {
+ have_neon = (auxv.a_un.a_val & HWCAP_NEON) ? kCPUFeatureNEON : 0;
+ break;
+ }
+ }
+ close (fd);
+ } else {
+ have_neon = 0;
+ }
+ detected = true;
+ }
+
+ return 0 | have_neon; // others here as we need them
+}
+#endif
+
// No CPU feature is available => straight C path.
int GetCPUInfoNoASM(CPUFeature feature) {
(void)feature;
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