Update Opus to 1.0.2.

celt/entcode.c

 /* Copyright (c) 2001-2011 Timothy B. Terriberry
 */
 /*
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
 
    - Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 
@@ skipping 15 matching lines @@
 */
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #include "entcode.h"
 #include "arch.h"
 
 #if !defined(EC_CLZ)
+/*This is a fallback for systems where we don't know how to access
+   a BSR or CLZ instruction (see ecintrin.h).
+  If you are optimizing Opus on a new platform and it has a native CLZ or
+   BZR (e.g. cell, MIPS, x86, etc) then making it available to Opus will be
+   an easy performance win.*/
 int ec_ilog(opus_uint32 _v){
   /*On a Pentium M, this branchless version tested as the fastest on
      1,000,000,000 random 32-bit integers, edging out a similar version with
      branches, and a 256-entry LUT version.*/
   int ret;
   int m;
   ret=!!_v;
   m=!!(_v&0xFFFF0000)<<4;
   _v>>=m;
   ret|=m;
@@ skipping 33 matching lines @@
   r=_this->rng>>(l-16);
   for(i=BITRES;i-->0;){
     int b;
     r=r*r>>15;
     b=(int)(r>>16);
     l=l<<1|b;
     r>>=b;
   }
   return nbits-l;
 }