init - 初始化项目

cmake/checks/cpu_neon.cpp

@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+#if defined _WIN32 && (defined(_M_ARM) || defined(_M_ARM64))
+# include <Intrin.h>
+# include <arm_neon.h>
+# define CV_NEON 1
+#elif defined(__ARM_NEON__) || (defined (__ARM_NEON) && defined(__aarch64__))
+#  include <arm_neon.h>
+#  define CV_NEON 1
+#endif
+
+// MSVC 2019 bug. Details: https://github.com/opencv/opencv/pull/16027
+void test_aliased_type(const uint8x16_t& a) { }
+void test_aliased_type(const int8x16_t& a) { }
+
+#if defined CV_NEON
+int test()
+{
+    const float src[] = { 0.0f, 0.0f, 0.0f, 0.0f };
+    float32x4_t val = vld1q_f32((const float32_t*)(src));
+    return (int)vgetq_lane_f32(val, 0);
+}
+#else
+#error "NEON is not supported"
+#endif
+
+int main()
+{
+  printf("%d\n", test());
+  return 0;
+}