* added simple test main - see comments about how to

  compile - should be probably made as a regression test

Originally committed as revision 565 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/i386/dsputil_mmx.c

@@ -928,6 +928,7 @@ static void clear_blocks_mmx(DCTELEM *blocks)
 static void just_return() { return; }
 #endif
 
+#ifndef TESTCPU_MAIN
 void dsputil_init_mmx(void)
 {
     mm_flags = mm_support();
@@ -1080,3 +1081,44 @@ void dsputil_set_bit_exact_mmx(void)
         }
     }
 }
+
+#else // TESTCPU_MAIN
+/*
+ * for testing speed of various routine - should be probably extended
+ * for a general purpose regression test later
+ *
+ * for now use it this way:
+ *
+ * gcc -O4 -fomit-frame-pointer -DHAVE_AV_CONFIG_H -DTESTCPU_MAIN  -I../.. -o test dsputil_mmx.c
+ *
+ * in libavcodec/i386 directory - then run ./test
+ */
+static inline long long rdtsc()
+{
+    long long l;
+    asm volatile(   "rdtsc\n\t"
+		    : "=A" (l)
+		);
+    return l;
+}
+
+int main(int argc, char* argv[])
+{
+    volatile int v;
+    int i;
+    const int linesize = 720;
+    char bu[32768];
+    uint64_t te, ts = rdtsc();
+    char* im = bu;
+    op_pixels_func fc = put_pixels_y2_mmx2;
+    for(i=0; i<1000000; i++){
+	fc(im, im + 1000, linesize, 16);
+	im += 16; //
+	if (im > bu + 10000)
+            im = bu;
+    }
+    te = rdtsc();
+    printf("CPU Ticks: %7d\n", (int)(te - ts));
+    fflush(stdout);
+}
+#endif