Initial population of libyuv
Change-Id: I46a6a1525aebaba979b0f2ca5b58be2004901410
diff --git a/files/source/cpu_id.cc b/files/source/cpu_id.cc
new file mode 100644
index 0000000..cc44e21
--- /dev/null
+++ b/files/source/cpu_id.cc
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2011 The LibYuv project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "libyuv/cpu_id.h"
+#include "libyuv/basic_types.h" // for CPU_X86
+
+#ifdef _MSC_VER
+#include <intrin.h>
+#endif
+
+// TODO(fbarchard): Use cpuid.h when gcc 4.4 is used on OSX and Linux.
+#if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
+static inline void __cpuid(int cpu_info[4], int info_type) {
+ __asm__ volatile (
+ "mov %%ebx, %%edi\n"
+ "cpuid\n"
+ "xchg %%edi, %%ebx\n"
+ : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+ : "a"(info_type)
+ );
+}
+#elif defined(__i386__) || defined(__x86_64__)
+static inline void __cpuid(int cpu_info[4], int info_type) {
+ __asm__ volatile (
+ "cpuid\n"
+ : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+ : "a"(info_type)
+ );
+}
+#endif
+
+namespace libyuv {
+
+// CPU detect function for SIMD instruction sets.
+static int cpu_info_ = 0;
+
+// TODO(fbarchard): (cpu_info[2] & 0x10000000 ? kCpuHasAVX : 0)
+static void InitCpuFlags() {
+#ifdef CPU_X86
+ int cpu_info[4];
+ __cpuid(cpu_info, 1);
+ cpu_info_ = (cpu_info[3] & 0x04000000 ? kCpuHasSSE2 : 0) |
+ (cpu_info[2] & 0x00000200 ? kCpuHasSSSE3 : 0) |
+ kCpuInitialized;
+#elif defined(__ARM_NEON__)
+ // gcc -mfpu=neon defines __ARM_NEON__
+ // Enable Neon if you want support for Neon and Arm, and use MaskCpuFlags
+ // to disable Neon on devices that do not have it.
+ cpu_info_ = kCpuHasNEON | kCpuInitialized;
+#else
+ cpu_info_ = kCpuInitialized;
+#endif
+}
+
+void MaskCpuFlags(int enable_flags) {
+ InitCpuFlags();
+ cpu_info_ &= enable_flags;
+}
+
+bool TestCpuFlag(int flag) {
+ if (0 == cpu_info_) {
+ InitCpuFlags();
+ }
+ return cpu_info_ & flag ? true : false;
+}
+
+} // namespace libyuv