Cache detected CPU flags

Originally committed as revision 25085 to svn://svn.ffmpeg.org/ffmpeg/trunk
15 years ago · a3f0d2b967
parent 9275438a19
commit a3f0d2b967
1 changed files with 11 additions and 4 deletions
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@ -21,10 +21,17 @@

 int av_get_cpu_flags(void)
 {
-    if (ARCH_ARM) return ff_get_cpu_flags_arm();
-    if (ARCH_PPC) return ff_get_cpu_flags_ppc();
-    if (ARCH_X86) return ff_get_cpu_flags_x86();
-    return 0;
+    static int flags, checked;
+
+    if (checked)
+        return flags;
+
+    if (ARCH_ARM) flags = ff_get_cpu_flags_arm();
+    if (ARCH_PPC) flags = ff_get_cpu_flags_ppc();
+    if (ARCH_X86) flags = ff_get_cpu_flags_x86();
+
+    checked = 1;
+    return flags;
 }

 #ifdef TEST