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slight restructuring, clean up

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This commit is contained in:
Mark Borgerding
2003-08-09 14:22:30 +00:00
parent db556661ed
commit b95e3ea18a
6 changed files with 24 additions and 193 deletions
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14
kiss_fft.c
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@ -140,7 +140,6 @@ void undo_bit_rev( kiss_fft_cpx * f, const int * swap_indices,int nswap)
}
#define OPT1
// the heart of the fft
static
void fft_work(int N,kiss_fft_cpx *f,const kiss_fft_cpx * twid,int twid_step)
@ -149,23 +148,10 @@ void fft_work(int N,kiss_fft_cpx *f,const kiss_fft_cpx * twid,int twid_step)
{ // declare automatic variables in here to reduce stack usage
int n;
kiss_fft_cpx csum,cdiff;
#ifdef OPT1
const kiss_fft_cpx * cur_twid = twid+twid_step;
kiss_fft_cpx *f1 = f;
kiss_fft_cpx *f2 = f+N;
C_SUB( cdiff, *f1 , *f2 );
C_ADD( csum, *f1 , *f2 );
*f1++ = csum;
*f2++ = cdiff;
for (n=1;n<N;++n)
#else
const kiss_fft_cpx * cur_twid = twid;
kiss_fft_cpx *f1 = f;
kiss_fft_cpx *f2 = f+N;
for (n=0;n<N;++n)
#endif
{
C_ADD( csum, *f1 , *f2 );
C_SUB( cdiff, *f1 , *f2 );