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made one single malloc for all buffers

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no noticable performance gain
This commit is contained in:
Mark Borgerding 2003-10-11 23:00:12 +00:00
parent f93a0258df
commit 0d44569b3b
1 changed files with 20 additions and 3 deletions
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23
kiss_fft.c
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@ -104,8 +104,8 @@ void fft_work(
for ( q1=0 ; q1<p ; ++q1 ) {
scratch[q1] = Fout[ k ];
#ifdef FIXED_POINT
scratch[q1].r = Fout[ k ].r>>1;
scratch[q1].i = Fout[ k ].i>>1;
scratch[q1].r >>= 1;
scratch[q1].i >>= 1;
#endif
k += m;
}
@ -137,17 +137,34 @@ void fft_work(
* */
void * kiss_fft_alloc(int nfft,int inverse_fft)
{
int allocsize;
int nstages=0;
int i;
kiss_fft_state * st=NULL;
st = ( kiss_fft_state *)malloc( sizeof(kiss_fft_state) );
allocsize = sizeof(kiss_fft_state)
+ sizeof(kiss_fft_cpx)*nfft // twiddle factors
+ sizeof(kiss_fft_cpx)*nfft // tmpbuf
+ sizeof(int)*nfft // factors
+ sizeof(kiss_fft_cpx)*nfft; // scratch
st = ( kiss_fft_state *)malloc( allocsize );
if (!st)
return NULL;
st->nfft=nfft;
st->inverse = inverse_fft;
st->twiddles = (kiss_fft_cpx*)(st+1); // just beyond struct
st->tmpbuf = (kiss_fft_cpx*)(st->twiddles + nfft);// just after twiddles
st->scratch = (kiss_fft_cpx*)(st->tmpbuf + nfft);
st->factors = (int*)(st->scratch + nfft); // just after tmpbuf
/*
st->twiddles = (kiss_fft_cpx*)malloc( sizeof(kiss_fft_cpx)*nfft );
st->tmpbuf = (kiss_fft_cpx*)malloc( sizeof(kiss_fft_cpx)*nfft );
st->scratch = (kiss_fft_cpx*)malloc( sizeof(kiss_fft_cpx)*nfft );
st->factors = (int*)malloc( sizeof(int)*nfft );
*/
for (i=0;i<nfft;++i) {
const double pi=3.14159265358979323846264338327;