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optimisation: Removed a bunch of conditional branches from comb2pulse()

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This commit is contained in:
Jean-Marc Valin 2008-04-18 16:46:39 +10:00
parent abdfc38837
commit e6ce0c6a22
5 changed files with 14 additions and 10 deletions
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15
libcelt/cwrs.c
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@ -266,18 +266,18 @@ celt_uint64_t icwrs64(int _n,int _m,const int *_x,const int *_s,
/*Converts a combination _x of _m unit pulses with associated sign bits _s into
a pulse vector _y of length _n.
_y: Returns the vector of pulses.
_x: The combination with elements sorted in ascending order.
_x: The combination with elements sorted in ascending order. _x[_m] = -1
_s: The associated sign bits.*/
void comb2pulse(int _n,int _m,int *_y,const int *_x,const int *_s){
void comb2pulse(int _n,int _m,int * restrict _y,const int *_x,const int *_s){
int j;
int k;
int n;
CELT_MEMSET(_y, 0, _n);
for(k=j=0;k<_m;k+=n){
for(n=1;k+n<_m&&_x[k+n]==_x[k];n++);
while(j<_x[k])_y[j++]=0;
_y[j++]=_s[k]?-n:n;
/* _x[_m] = -1 so we won't overflow */
for(n=1;_x[k+n]==_x[k];n++);
_y[_x[k]]=_s[k]?-n:n;
}
while(j<_n)_y[j++]=0;
}
/*Converts a pulse vector vector _y of length _n into a combination of _m unit
@ -370,7 +370,7 @@ void decode_pulses(int *_y, int N, int K, ec_dec *dec)
VARDECL(int, signs);
SAVE_STACK;
ALLOC(comb, K, int);
ALLOC(comb, K+1, int);
ALLOC(signs, K, int);
/* Simple heuristic to figure out whether it fits in 32 bits */
if((N+4)*(K+4)<250 || (celt_ilog2(N)+1)*K<31)
@ -379,6 +379,7 @@ void decode_pulses(int *_y, int N, int K, ec_dec *dec)
} else {
decode_comb64(N, K, comb, signs, dec);
}
comb[K] = -1;
comb2pulse(N, K, _y, comb, signs);
RESTORE_STACK;
}