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optimisation: shaving a few cycles off prev_cwrs* by not computed the values

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we're not going to use.
This commit is contained in:
Jean-Marc Valin 2008-03-26 15:46:51 +11:00
parent a56c34f381
commit 233e317202
2 changed files with 9 additions and 9 deletions
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16
libcelt/cwrs.c
View file

@ -181,9 +181,9 @@ void cwrsi(int _n,int _m,celt_uint32_t _i,int * restrict _x,int * restrict _s){
_x[k]=j; _x[k]=j;
if(_s[k])_i-=t; if(_s[k])_i-=t;
if (k<_m-2) if (k<_m-2)
prev_ncwrs32(nc, _n+1, 0); prev_ncwrs32(nc, _n-j+1, 0);
else else
prev_ncwrs32(nc, _n+1, 1); prev_ncwrs32(nc, _n-j+1, 1);
} }
RESTORE_STACK; RESTORE_STACK;
} }
@ -210,9 +210,9 @@ celt_uint32_t icwrs(int _n,int _m,const int *_x,const int *_s, celt_uint32_t *bo
celt_uint32_t pn; celt_uint32_t pn;
celt_uint32_t p; celt_uint32_t p;
if (k<_m-1) if (k<_m-1)
prev_ncwrs32(nc, _n+1, 0); prev_ncwrs32(nc, _n-j+1, 0);
else else
prev_ncwrs32(nc, _n+1, 1); prev_ncwrs32(nc, _n-j+1, 1);
/*p=ncwrs(_n-j,_m-k-1); /*p=ncwrs(_n-j,_m-k-1);
pn=ncwrs(_n-j-1,_m-k-1);*/ pn=ncwrs(_n-j-1,_m-k-1);*/
p=nc[_n-j]; p=nc[_n-j];
@ -271,9 +271,9 @@ void cwrsi64(int _n,int _m,celt_uint64_t _i,int * restrict _x,int * restrict _s)
_x[k]=j; _x[k]=j;
if(_s[k])_i-=t; if(_s[k])_i-=t;
if (k<_m-2) if (k<_m-2)
prev_ncwrs64(nc, _n+1, 0); prev_ncwrs64(nc, _n-j+1, 0);
else else
prev_ncwrs64(nc, _n+1, 1); prev_ncwrs64(nc, _n-j+1, 1);
} }
RESTORE_STACK; RESTORE_STACK;
} }
@ -300,9 +300,9 @@ celt_uint64_t icwrs64(int _n,int _m,const int *_x,const int *_s, celt_uint64_t *
celt_uint64_t pn; celt_uint64_t pn;
celt_uint64_t p; celt_uint64_t p;
if (k<_m-1) if (k<_m-1)
prev_ncwrs64(nc, _n+1, 0); prev_ncwrs64(nc, _n-j+1, 0);
else else
prev_ncwrs64(nc, _n+1, 1); prev_ncwrs64(nc, _n-j+1, 1);
/*p=ncwrs64(_n-j,_m-k-1); /*p=ncwrs64(_n-j,_m-k-1);
pn=ncwrs64(_n-j-1,_m-k-1);*/ pn=ncwrs64(_n-j-1,_m-k-1);*/
p=nc[_n-j]; p=nc[_n-j];

2
libcelt/vq.c
View file

@ -179,7 +179,7 @@ void alg_quant(celt_norm_t *X, celt_mask_t *W, int N, int K, const celt_norm_t *
den = ROUND16(Ryy,14); den = ROUND16(Ryy,14);
/* The idea is to check for num/den >= best_num/best_den, but that way /* The idea is to check for num/den >= best_num/best_den, but that way
we can do it without any division */ we can do it without any division */
if (MULT16_32_Q15(best_den, num) >= MULT16_32_Q15(den, best_num)) if (MULT16_32_Q15(best_den, num) > MULT16_32_Q15(den, best_num))
{ {
best_den = den; best_den = den;
best_num = num; best_num = num;