commit f400a3c573ae50c1f4b7b19815700bfe12f0add5
author Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> Mon Apr 05 23:58:44 2010 -0400
committer Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> Tue Apr 06 20:33:50 2010 -0400
tree 72269b0995756ec2bb26112a3d3f80f4766e7e65
parent 64209a3edf1b9d00f26775bc54b62ae3de5f4113

Caching log2_frac(N, BITRES) in the more data to save some CPU

libcelt/modes.c

diff --git a/libcelt/modes.c b/libcelt/modes.c
index 87f122f..3358b65 100644
--- a/libcelt/modes.c
+++ b/libcelt/modes.c
@@ -273,6 +273,7 @@
    int res;
    CELTMode *mode=NULL;
    celt_word16 *window;
+   celt_int16 *logN;
    ALLOC_STACK;
 #if !defined(VAR_ARRAYS) && !defined(USE_ALLOCA)
    if (global_stack==NULL)
@@ -367,6 +368,13 @@
    if (mode->bits==NULL)
       goto failure;
 
+   logN = (celt_int16*)celt_alloc(mode->nbEBands*sizeof(celt_int16));
+   if (logN==NULL)
+      goto failure;
+
+   for (i=0;i<mode->nbEBands;i++)
+      logN[i] = log2_frac(mode->eBands[i+1]-mode->eBands[i], BITRES);
+   mode->logN = logN;
 #endif /* !STATIC_MODES */
 
    clt_mdct_init(&mode->mdct, 2*mode->mdctSize);