[FFmpeg-cvslog] avutil/cpu: remove the |checked| static variable

[Wan-Teh Chang]

ffmpeg | branch: master | Wan-Teh Chang <wtc-at-google.com at ffmpeg.org> | Wed Nov 23 11:21:56 2016 -0800| [29fb49194bedc74ac9be0b49b6b42dcfeb6222d9] | committer: Michael Niedermayer

avutil/cpu: remove the |checked| static variable

Remove the |checked| variable because the invalid value of -1 for
|flags| can be used to indicate the same condition. Also rename |flags|
to |cpu_flags| because there are a local variable and a function
parameter named |flags| in the same file.

Co-author: Dmitry Vyukov of Google

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=29fb49194bedc74ac9be0b49b6b42dcfeb6222d9
---

 libavutil/cpu.c | 40 +++++++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index f5785fc..73317c4 100644
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -44,7 +44,20 @@
 #include <unistd.h>
 #endif
 
-static int flags, checked;
+static int cpu_flags = -1;
+
+static int get_cpu_flags(void)
+{
+    if (ARCH_AARCH64)
+        return ff_get_cpu_flags_aarch64();
+    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;
+}
 
 void av_force_cpu_flags(int arg){
     if (   (arg & ( AV_CPU_FLAG_3DNOW    |
@@ -69,33 +82,22 @@ void av_force_cpu_flags(int arg){
         arg |= AV_CPU_FLAG_MMX;
     }
 
-    flags   = arg;
-    checked = arg != -1;
+    cpu_flags = arg;
 }
 
 int av_get_cpu_flags(void)
 {
-    if (checked)
-        return flags;
-
-    if (ARCH_AARCH64)
-        flags = ff_get_cpu_flags_aarch64();
-    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;
+    int flags = cpu_flags;
+    if (flags == -1) {
+        flags = get_cpu_flags();
+        cpu_flags = flags;
+    }
     return flags;
 }
 
 void av_set_cpu_flags_mask(int mask)
 {
-    checked       = 0;
-    flags         = av_get_cpu_flags() & mask;
-    checked       = 1;
+    cpu_flags = get_cpu_flags() & mask;
 }
 
 int av_parse_cpu_flags(const char *s)