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/chre-3.4.0/external/kiss_fft/
Dkiss_fft.c60 kiss_fft_cpx scratch[6]; in kf_bfly4() local
71 C_MUL(scratch[0],Fout[m] , *tw1 ); in kf_bfly4()
72 C_MUL(scratch[1],Fout[m2] , *tw2 ); in kf_bfly4()
73 C_MUL(scratch[2],Fout[m3] , *tw3 ); in kf_bfly4()
75 C_SUB( scratch[5] , *Fout, scratch[1] ); in kf_bfly4()
76 C_ADDTO(*Fout, scratch[1]); in kf_bfly4()
77 C_ADD( scratch[3] , scratch[0] , scratch[2] ); in kf_bfly4()
78 C_SUB( scratch[4] , scratch[0] , scratch[2] ); in kf_bfly4()
79 C_SUB( Fout[m2], *Fout, scratch[3] ); in kf_bfly4()
83 C_ADDTO( *Fout , scratch[3] ); in kf_bfly4()
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Dkissfft.hh134 cpx_type scratch[7]; in kf_bfly4() local
137 scratch[0] = Fout[k+m] * _traits.twiddle(k*fstride); in kf_bfly4()
138 scratch[1] = Fout[k+2*m] * _traits.twiddle(k*fstride*2); in kf_bfly4()
139 scratch[2] = Fout[k+3*m] * _traits.twiddle(k*fstride*3); in kf_bfly4()
140 scratch[5] = Fout[k] - scratch[1]; in kf_bfly4()
142 Fout[k] += scratch[1]; in kf_bfly4()
143 scratch[3] = scratch[0] + scratch[2]; in kf_bfly4()
144 scratch[4] = scratch[0] - scratch[2]; in kf_bfly4()
145 …scratch[4] = cpx_type( scratch[4].imag()*negative_if_inverse , -scratch[4].real()* negative_if_inv… in kf_bfly4()
147 Fout[k+2*m] = Fout[k] - scratch[3]; in kf_bfly4()
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