void fft_calc_altivec(FFTContext *s, FFTComplex *z) { POWERPC_TBL_DECLARE(altivec_fft_num, s->nbits >= 6); #ifdef ALTIVEC_USE_REFERENCE_C_CODE int ln = s->nbits; int j, np, np2; int nblocks, nloops; register FFTComplex *p, *q; FFTComplex *exptab = s->exptab; int l; FFTSample tmp_re, tmp_im; POWERPC_TBL_START_COUNT(altivec_fft_num, s->nbits >= 6); np = 1 << ln; /* pass 0 */ p=&z[0]; j=(np >> 1); do { BF(p[0].re, p[0].im, p[1].re, p[1].im, p[0].re, p[0].im, p[1].re, p[1].im); p+=2; } while (--j != 0); /* pass 1 */ p=&z[0]; j=np >> 2; if (s->inverse) { do { BF(p[0].re, p[0].im, p[2].re, p[2].im, p[0].re, p[0].im, p[2].re, p[2].im); BF(p[1].re, p[1].im, p[3].re, p[3].im, p[1].re, p[1].im, -p[3].im, p[3].re); p+=4; } while (--j != 0); } else { do { BF(p[0].re, p[0].im, p[2].re, p[2].im, p[0].re, p[0].im, p[2].re, p[2].im); BF(p[1].re, p[1].im, p[3].re, p[3].im, p[1].re, p[1].im, p[3].im, -p[3].re); p+=4; } while (--j != 0); } /* pass 2 .. ln-1 */ nblocks = np >> 3; nloops = 1 << 2; np2 = np >> 1; do { p = z; q = z + nloops; for (j = 0; j < nblocks; ++j) { BF(p->re, p->im, q->re, q->im, p->re, p->im, q->re, q->im); p++; q++; for(l = nblocks; l < np2; l += nblocks) { CMUL(tmp_re, tmp_im, exptab[l].re, exptab[l].im, q->re, q->im); BF(p->re, p->im, q->re, q->im, p->re, p->im, tmp_re, tmp_im); p++; q++; } p += nloops; q += nloops; } nblocks = nblocks >> 1; nloops = nloops << 1; } while (nblocks != 0); POWERPC_TBL_STOP_COUNT(altivec_fft_num, s->nbits >= 6); #else /* ALTIVEC_USE_REFERENCE_C_CODE */ #ifdef CONFIG_DARWIN register const vector float vczero = (const vector float)(0.); #else register const vector float vczero = (const vector float){0.,0.,0.,0.}; #endif int ln = s->nbits; int j, np, np2; int nblocks, nloops; register FFTComplex *p, *q; FFTComplex *cptr, *cptr1; int k; POWERPC_TBL_START_COUNT(altivec_fft_num, s->nbits >= 6); np = 1 << ln; { vector float *r, a, b, a1, c1, c2; r = (vector float *)&z[0]; c1 = vcii(p,p,n,n); if (s->inverse) { c2 = vcii(p,p,n,p); } else { c2 = vcii(p,p,p,n); } j = (np >> 2); do { a = vec_ld(0, r); a1 = vec_ld(sizeof(vector float), r); b = vec_perm(a,a,vcprmle(1,0,3,2)); a = vec_madd(a,c1,b); /* do the pass 0 butterfly */ b = vec_perm(a1,a1,vcprmle(1,0,3,2)); b = vec_madd(a1,c1,b); /* do the pass 0 butterfly */ /* multiply third by -i */ b = vec_perm(b,b,vcprmle(2,3,1,0)); /* do the pass 1 butterfly */ vec_st(vec_madd(b,c2,a), 0, r); vec_st(vec_nmsub(b,c2,a), sizeof(vector float), r); r += 2; } while (--j != 0); } /* pass 2 .. ln-1 */ nblocks = np >> 3; nloops = 1 << 2; np2 = np >> 1; cptr1 = s->exptab1; do { p = z; q = z + nloops; j = nblocks; do { cptr = cptr1; k = nloops >> 1; do { vector float a,b,c,t1; a = vec_ld(0, (float*)p); b = vec_ld(0, (float*)q); /* complex mul */ c = vec_ld(0, (float*)cptr); /* cre*re cim*re */ t1 = vec_madd(c, vec_perm(b,b,vcprmle(2,2,0,0)),vczero); c = vec_ld(sizeof(vector float), (float*)cptr); /* -cim*im cre*im */ b = vec_madd(c, vec_perm(b,b,vcprmle(3,3,1,1)),t1); /* butterfly */ vec_st(vec_add(a,b), 0, (float*)p); vec_st(vec_sub(a,b), 0, (float*)q); p += 2; q += 2; cptr += 4; } while (--k); p += nloops; q += nloops; } while (--j); cptr1 += nloops * 2; nblocks = nblocks >> 1; nloops = nloops << 1; } while (nblocks != 0); POWERPC_TBL_STOP_COUNT(altivec_fft_num, s->nbits >= 6); #endif /* ALTIVEC_USE_REFERENCE_C_CODE */ }