[MPlayer-dev-eng] [PATCH] slightly faster float2int

[Reimar Döffinger]

Hi,
please comment and if possible benchmark as well. Not sure if it's worth
changing, but this rots in my tree...

Greetings,
Reimar Döffinger
-------------- next part --------------
Index: libaf/af_format.c
===================================================================
RCS file: /cvsroot/mplayer/main/libaf/af_format.c,v
retrieving revision 1.31
diff -u -r1.31 af_format.c
--- libaf/af_format.c	13 Nov 2005 18:28:44 -0000	1.31
+++ libaf/af_format.c	11 Apr 2006 09:45:18 -0000
@@ -467,23 +467,31 @@
 
 static void float2int(float* in, void* out, int len, int bps)
 {
-  register int i;
+  register long i = -len;
+  if (len <= 0)
+    return;
+  in = &in[len];
+  out += bps * len;
   switch(bps){
   case(1):
-    for(i=0;i<len;i++)
+    do {
       ((int8_t*)out)[i] = lrintf(127.0 * in[i]);
+    } while (++i);
     break;
   case(2): 
-    for(i=0;i<len;i++)
+    do {
       ((int16_t*)out)[i] = lrintf(32767.0 * in[i]);
+    } while (++i);
     break;
   case(3):
-    for(i=0;i<len;i++)
+    do {
       store24bit(out, i, lrintf(2147483647.0 * in[i]));
+    } while (++i);
     break;
   case(4):
-    for(i=0;i<len;i++)
+    do {
       ((int32_t*)out)[i] = lrintf(2147483647.0 * in[i]);
+    } while (++i);
     break;
   }	
 }