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|
/* temperton/dgpfa3f.f -- translated by f2c (version 20050501).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
-- in that order, at the end of the command line, as in
cc *.o -lf2c -lm
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
http://www.netlib.org/f2c/libf2c.zip
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/* Table of constant values */
static integer c__3 = 3;
/* fortran version of *dgpfa3* - */
/* radix-3 section of self-sorting, in-place */
/* generalized PFA */
/* ------------------------------------------------------------------- */
/*< subroutine dgpfa3f(a,b,trigs,inc,jump,n,mm,lot,isign) >*/
/* Subroutine */ int dgpfa3f_(doublereal *a, doublereal *b, doublereal *trigs,
integer *inc, integer *jump, integer *n, integer *mm, integer *lot,
integer *isign)
{
/* Initialized data */
static doublereal sin60 = .866025403784437; /* constant */
static integer lvr = 128; /* constant */
/* System generated locals */
integer i__1, i__2, i__3, i__4, i__5, i__6, i__7, i__8, i__9, i__10;
/* Builtin functions */
integer pow_ii(integer *, integer *);
/* Local variables */
integer j, k, l, m;
doublereal s, c1;
integer n3;
doublereal t1, t2, t3, u1, u2, u3;
integer ja, jb, la, jc, jd, nb, je, jf, jg, jh, mh, kk, ji, ll, mu, nu;
doublereal co1, co2, si1, si2, aja, ajb, ajc, bjb, bjc, bja, ajd, bjd,
aje, ajf, ajh, bje, bjf, bjh, aji, ajg, bji, bjg;
integer jjj, ink, inq, ninc, left, nvex, ipass, nblox, jstep, laincl,
jstepl, istart, jstepx;
/*< double precision a(*), b(*), trigs(*) >*/
/*< integer inc, jump, n, mm, lot, isign >*/
/*< double precision s, c1, t1, t2, t3, u1, u2, u3, co1, co2 >*/
/*< double precision si1, si2, aja, ajb, ajc, bjb, bjc, bja, ajd, bjd >*/
/*< double precision aje, ajf, ajh, bje, bjf, bjh, aji, ajg, bji, bjg >*/
/*< data sin60/0.866025403784437d+0/ >*/
/* Parameter adjustments */
--trigs;
--b;
--a;
/* Function Body */
/*< data lvr/128/ >*/
/* *************************************************************** */
/* * * */
/* * N.B. LVR = LENGTH OF VECTOR REGISTERS, SET TO 128 FOR C90. * */
/* * RESET TO 64 FOR OTHER CRAY MACHINES, OR TO ANY LARGE VALUE * */
/* * (GREATER THAN OR EQUAL TO LOT) FOR A SCALAR COMPUTER. * */
/* * * */
/* *************************************************************** */
/*< n3 = 3**mm >*/
n3 = pow_ii(&c__3, mm);
/*< inq = n/n3 >*/
inq = *n / n3;
/*< jstepx = (n3-n) * inc >*/
jstepx = (n3 - *n) * *inc;
/*< ninc = n * inc >*/
ninc = *n * *inc;
/*< ink = inc * inq >*/
ink = *inc * inq;
/*< mu = mod(inq,3) >*/
mu = inq % 3;
/*< if (isign.eq.-1) mu = 3-mu >*/
if (*isign == -1) {
mu = 3 - mu;
}
/*< m = mm >*/
m = *mm;
/*< mh = (m+1)/2 >*/
mh = (m + 1) / 2;
/*< s = dfloat(isign) >*/
s = (doublereal) (*isign);
/*< c1 = sin60 >*/
c1 = sin60;
/*< if (mu.eq.2) c1 = -c1 >*/
if (mu == 2) {
c1 = -c1;
}
/*< nblox = 1 + (lot-1)/lvr >*/
nblox = (*lot - 1) / lvr + 1;
/*< left = lot >*/
left = *lot;
/*< s = dfloat(isign) >*/
s = (doublereal) (*isign);
/*< istart = 1 >*/
istart = 1;
/* loop on blocks of lvr transforms */
/* -------------------------------- */
/*< do 500 nb = 1 , nblox >*/
i__1 = nblox;
for (nb = 1; nb <= i__1; ++nb) {
/*< if (left.le.lvr) then >*/
if (left <= lvr) {
/*< nvex = left >*/
nvex = left;
/*< else if (left.lt.(2*lvr)) then >*/
} else if (left < lvr << 1) {
/*< nvex = left/2 >*/
nvex = left / 2;
/*< nvex = nvex + mod(nvex,2) >*/
nvex += nvex % 2;
/*< else >*/
} else {
/*< nvex = lvr >*/
nvex = lvr;
/*< endif >*/
}
/*< left = left - nvex >*/
left -= nvex;
/*< la = 1 >*/
la = 1;
/* loop on type I radix-3 passes */
/* ----------------------------- */
/*< do 160 ipass = 1 , mh >*/
i__2 = mh;
for (ipass = 1; ipass <= i__2; ++ipass) {
/*< jstep = (n*inc) / (3*la) >*/
jstep = *n * *inc / (la * 3);
/*< jstepl = jstep - ninc >*/
jstepl = jstep - ninc;
/* k = 0 loop (no twiddle factors) */
/* ------------------------------- */
/*< do 120 jjj = 0 , (n-1)*inc , 3*jstep >*/
i__3 = (*n - 1) * *inc;
i__4 = jstep * 3;
for (jjj = 0; i__4 < 0 ? jjj >= i__3 : jjj <= i__3; jjj += i__4) {
/*< ja = istart + jjj >*/
ja = istart + jjj;
/* "transverse" loop */
/* ----------------- */
/*< do 115 nu = 1 , inq >*/
i__5 = inq;
for (nu = 1; nu <= i__5; ++nu) {
/*< jb = ja + jstepl >*/
jb = ja + jstepl;
/*< if (jb.lt.istart) jb = jb + ninc >*/
if (jb < istart) {
jb += ninc;
}
/*< jc = jb + jstepl >*/
jc = jb + jstepl;
/*< if (jc.lt.istart) jc = jc + ninc >*/
if (jc < istart) {
jc += ninc;
}
/*< j = 0 >*/
j = 0;
/* loop across transforms */
/* ---------------------- */
/* dir$ ivdep, shortloop */
/*< do 110 l = 1 , nvex >*/
i__6 = nvex;
for (l = 1; l <= i__6; ++l) {
/*< ajb = a(jb+j) >*/
ajb = a[jb + j];
/*< ajc = a(jc+j) >*/
ajc = a[jc + j];
/*< t1 = ajb + ajc >*/
t1 = ajb + ajc;
/*< aja = a(ja+j) >*/
aja = a[ja + j];
/*< t2 = aja - 0.5 * t1 >*/
t2 = aja - t1 * (float).5;
/*< t3 = c1 * ( ajb - ajc ) >*/
t3 = c1 * (ajb - ajc);
/*< bjb = b(jb+j) >*/
bjb = b[jb + j];
/*< bjc = b(jc+j) >*/
bjc = b[jc + j];
/*< u1 = bjb + bjc >*/
u1 = bjb + bjc;
/*< bja = b(ja+j) >*/
bja = b[ja + j];
/*< u2 = bja - 0.5 * u1 >*/
u2 = bja - u1 * (float).5;
/*< u3 = c1 * ( bjb - bjc ) >*/
u3 = c1 * (bjb - bjc);
/*< a(ja+j) = aja + t1 >*/
a[ja + j] = aja + t1;
/*< b(ja+j) = bja + u1 >*/
b[ja + j] = bja + u1;
/*< a(jb+j) = t2 - u3 >*/
a[jb + j] = t2 - u3;
/*< b(jb+j) = u2 + t3 >*/
b[jb + j] = u2 + t3;
/*< a(jc+j) = t2 + u3 >*/
a[jc + j] = t2 + u3;
/*< b(jc+j) = u2 - t3 >*/
b[jc + j] = u2 - t3;
/*< j = j + jump >*/
j += *jump;
/*< 110 continue >*/
/* L110: */
}
/*< ja = ja + jstepx >*/
ja += jstepx;
/*< if (ja.lt.istart) ja = ja + ninc >*/
if (ja < istart) {
ja += ninc;
}
/*< 115 continue >*/
/* L115: */
}
/*< 120 continue >*/
/* L120: */
}
/* finished if n3 = 3 */
/* ------------------ */
/*< if (n3.eq.3) go to 490 >*/
if (n3 == 3) {
goto L490;
}
/*< kk = 2 * la >*/
kk = la << 1;
/* loop on nonzero k */
/* ----------------- */
/*< do 150 k = ink , jstep-ink , ink >*/
i__4 = jstep - ink;
i__3 = ink;
for (k = ink; i__3 < 0 ? k >= i__4 : k <= i__4; k += i__3) {
/*< co1 = trigs(kk+1) >*/
co1 = trigs[kk + 1];
/*< si1 = s*trigs(kk+2) >*/
si1 = s * trigs[kk + 2];
/*< co2 = trigs(2*kk+1) >*/
co2 = trigs[(kk << 1) + 1];
/*< si2 = s*trigs(2*kk+2) >*/
si2 = s * trigs[(kk << 1) + 2];
/* loop along transform */
/* -------------------- */
/*< do 140 jjj = k , (n-1)*inc , 3*jstep >*/
i__5 = (*n - 1) * *inc;
i__6 = jstep * 3;
for (jjj = k; i__6 < 0 ? jjj >= i__5 : jjj <= i__5; jjj +=
i__6) {
/*< ja = istart + jjj >*/
ja = istart + jjj;
/* "transverse" loop */
/* ----------------- */
/*< do 135 nu = 1 , inq >*/
i__7 = inq;
for (nu = 1; nu <= i__7; ++nu) {
/*< jb = ja + jstepl >*/
jb = ja + jstepl;
/*< if (jb.lt.istart) jb = jb + ninc >*/
if (jb < istart) {
jb += ninc;
}
/*< jc = jb + jstepl >*/
jc = jb + jstepl;
/*< if (jc.lt.istart) jc = jc + ninc >*/
if (jc < istart) {
jc += ninc;
}
/*< j = 0 >*/
j = 0;
/* loop across transforms */
/* ---------------------- */
/* dir$ ivdep,shortloop */
/*< do 130 l = 1 , nvex >*/
i__8 = nvex;
for (l = 1; l <= i__8; ++l) {
/*< ajb = a(jb+j) >*/
ajb = a[jb + j];
/*< ajc = a(jc+j) >*/
ajc = a[jc + j];
/*< t1 = ajb + ajc >*/
t1 = ajb + ajc;
/*< aja = a(ja+j) >*/
aja = a[ja + j];
/*< t2 = aja - 0.5 * t1 >*/
t2 = aja - t1 * (float).5;
/*< t3 = c1 * ( ajb - ajc ) >*/
t3 = c1 * (ajb - ajc);
/*< bjb = b(jb+j) >*/
bjb = b[jb + j];
/*< bjc = b(jc+j) >*/
bjc = b[jc + j];
/*< u1 = bjb + bjc >*/
u1 = bjb + bjc;
/*< bja = b(ja+j) >*/
bja = b[ja + j];
/*< u2 = bja - 0.5 * u1 >*/
u2 = bja - u1 * (float).5;
/*< u3 = c1 * ( bjb - bjc ) >*/
u3 = c1 * (bjb - bjc);
/*< a(ja+j) = aja + t1 >*/
a[ja + j] = aja + t1;
/*< b(ja+j) = bja + u1 >*/
b[ja + j] = bja + u1;
/*< a(jb+j) = co1*(t2-u3) - si1*(u2+t3) >*/
a[jb + j] = co1 * (t2 - u3) - si1 * (u2 + t3);
/*< b(jb+j) = si1*(t2-u3) + co1*(u2+t3) >*/
b[jb + j] = si1 * (t2 - u3) + co1 * (u2 + t3);
/*< a(jc+j) = co2*(t2+u3) - si2*(u2-t3) >*/
a[jc + j] = co2 * (t2 + u3) - si2 * (u2 - t3);
/*< b(jc+j) = si2*(t2+u3) + co2*(u2-t3) >*/
b[jc + j] = si2 * (t2 + u3) + co2 * (u2 - t3);
/*< j = j + jump >*/
j += *jump;
/*< 130 continue >*/
/* L130: */
}
/* -----( end of loop across transforms ) */
/*< ja = ja + jstepx >*/
ja += jstepx;
/*< if (ja.lt.istart) ja = ja + ninc >*/
if (ja < istart) {
ja += ninc;
}
/*< 135 continue >*/
/* L135: */
}
/*< 140 continue >*/
/* L140: */
}
/* -----( end of loop along transforms ) */
/*< kk = kk + 2*la >*/
kk += la << 1;
/*< 150 continue >*/
/* L150: */
}
/* -----( end of loop on nonzero k ) */
/*< la = 3*la >*/
la *= 3;
/*< 160 continue >*/
/* L160: */
}
/* -----( end of loop on type I radix-3 passes) */
/* loop on type II radix-3 passes */
/* ------------------------------ */
/*< 400 continue >*/
/* L400: */
/*< do 480 ipass = mh+1 , m >*/
i__2 = m;
for (ipass = mh + 1; ipass <= i__2; ++ipass) {
/*< jstep = (n*inc) / (3*la) >*/
jstep = *n * *inc / (la * 3);
/*< jstepl = jstep - ninc >*/
jstepl = jstep - ninc;
/*< laincl = la*ink - ninc >*/
laincl = la * ink - ninc;
/* k=0 loop (no twiddle factors) */
/* ----------------------------- */
/*< do 430 ll = 0 , (la-1)*ink , 3*jstep >*/
i__3 = (la - 1) * ink;
i__4 = jstep * 3;
for (ll = 0; i__4 < 0 ? ll >= i__3 : ll <= i__3; ll += i__4) {
/*< do 420 jjj = ll , (n-1)*inc , 3*la*ink >*/
i__6 = (*n - 1) * *inc;
i__5 = la * 3 * ink;
for (jjj = ll; i__5 < 0 ? jjj >= i__6 : jjj <= i__6; jjj +=
i__5) {
/*< ja = istart + jjj >*/
ja = istart + jjj;
/* "transverse" loop */
/* ----------------- */
/*< do 415 nu = 1 , inq >*/
i__7 = inq;
for (nu = 1; nu <= i__7; ++nu) {
/*< jb = ja + jstepl >*/
jb = ja + jstepl;
/*< if (jb.lt.istart) jb = jb + ninc >*/
if (jb < istart) {
jb += ninc;
}
/*< jc = jb + jstepl >*/
jc = jb + jstepl;
/*< if (jc.lt.istart) jc = jc + ninc >*/
if (jc < istart) {
jc += ninc;
}
/*< jd = ja + laincl >*/
jd = ja + laincl;
/*< if (jd.lt.istart) jd = jd + ninc >*/
if (jd < istart) {
jd += ninc;
}
/*< je = jd + jstepl >*/
je = jd + jstepl;
/*< if (je.lt.istart) je = je + ninc >*/
if (je < istart) {
je += ninc;
}
/*< jf = je + jstepl >*/
jf = je + jstepl;
/*< if (jf.lt.istart) jf = jf + ninc >*/
if (jf < istart) {
jf += ninc;
}
/*< jg = jd + laincl >*/
jg = jd + laincl;
/*< if (jg.lt.istart) jg = jg + ninc >*/
if (jg < istart) {
jg += ninc;
}
/*< jh = jg + jstepl >*/
jh = jg + jstepl;
/*< if (jh.lt.istart) jh = jh + ninc >*/
if (jh < istart) {
jh += ninc;
}
/*< ji = jh + jstepl >*/
ji = jh + jstepl;
/*< if (ji.lt.istart) ji = ji + ninc >*/
if (ji < istart) {
ji += ninc;
}
/*< j = 0 >*/
j = 0;
/* loop across transforms */
/* ---------------------- */
/* dir$ ivdep, shortloop */
/*< do 410 l = 1 , nvex >*/
i__8 = nvex;
for (l = 1; l <= i__8; ++l) {
/*< ajb = a(jb+j) >*/
ajb = a[jb + j];
/*< ajc = a(jc+j) >*/
ajc = a[jc + j];
/*< t1 = ajb + ajc >*/
t1 = ajb + ajc;
/*< aja = a(ja+j) >*/
aja = a[ja + j];
/*< t2 = aja - 0.5 * t1 >*/
t2 = aja - t1 * (float).5;
/*< t3 = c1 * ( ajb - ajc ) >*/
t3 = c1 * (ajb - ajc);
/*< ajd = a(jd+j) >*/
ajd = a[jd + j];
/*< ajb = ajd >*/
ajb = ajd;
/*< bjb = b(jb+j) >*/
bjb = b[jb + j];
/*< bjc = b(jc+j) >*/
bjc = b[jc + j];
/*< u1 = bjb + bjc >*/
u1 = bjb + bjc;
/*< bja = b(ja+j) >*/
bja = b[ja + j];
/*< u2 = bja - 0.5 * u1 >*/
u2 = bja - u1 * (float).5;
/*< u3 = c1 * ( bjb - bjc ) >*/
u3 = c1 * (bjb - bjc);
/*< bjd = b(jd+j) >*/
bjd = b[jd + j];
/*< bjb = bjd >*/
bjb = bjd;
/*< a(ja+j) = aja + t1 >*/
a[ja + j] = aja + t1;
/*< b(ja+j) = bja + u1 >*/
b[ja + j] = bja + u1;
/*< a(jd+j) = t2 - u3 >*/
a[jd + j] = t2 - u3;
/*< b(jd+j) = u2 + t3 >*/
b[jd + j] = u2 + t3;
/*< ajc = t2 + u3 >*/
ajc = t2 + u3;
/*< bjc = u2 - t3 >*/
bjc = u2 - t3;
/* ---------------------- */
/*< aje = a(je+j) >*/
aje = a[je + j];
/*< ajf = a(jf+j) >*/
ajf = a[jf + j];
/*< t1 = aje + ajf >*/
t1 = aje + ajf;
/*< t2 = ajb - 0.5 * t1 >*/
t2 = ajb - t1 * (float).5;
/*< t3 = c1 * ( aje - ajf ) >*/
t3 = c1 * (aje - ajf);
/*< ajh = a(jh+j) >*/
ajh = a[jh + j];
/*< ajf = ajh >*/
ajf = ajh;
/*< bje = b(je+j) >*/
bje = b[je + j];
/*< bjf = b(jf+j) >*/
bjf = b[jf + j];
/*< u1 = bje + bjf >*/
u1 = bje + bjf;
/*< u2 = bjb - 0.5 * u1 >*/
u2 = bjb - u1 * (float).5;
/*< u3 = c1 * ( bje - bjf ) >*/
u3 = c1 * (bje - bjf);
/*< bjh = b(jh+j) >*/
bjh = b[jh + j];
/*< bjf = bjh >*/
bjf = bjh;
/*< a(jb+j) = ajb + t1 >*/
a[jb + j] = ajb + t1;
/*< b(jb+j) = bjb + u1 >*/
b[jb + j] = bjb + u1;
/*< a(je+j) = t2 - u3 >*/
a[je + j] = t2 - u3;
/*< b(je+j) = u2 + t3 >*/
b[je + j] = u2 + t3;
/*< a(jh+j) = t2 + u3 >*/
a[jh + j] = t2 + u3;
/*< b(jh+j) = u2 - t3 >*/
b[jh + j] = u2 - t3;
/* ---------------------- */
/*< aji = a(ji+j) >*/
aji = a[ji + j];
/*< t1 = ajf + aji >*/
t1 = ajf + aji;
/*< ajg = a(jg+j) >*/
ajg = a[jg + j];
/*< t2 = ajg - 0.5 * t1 >*/
t2 = ajg - t1 * (float).5;
/*< t3 = c1 * ( ajf - aji ) >*/
t3 = c1 * (ajf - aji);
/*< t1 = ajg + t1 >*/
t1 = ajg + t1;
/*< a(jg+j) = ajc >*/
a[jg + j] = ajc;
/*< bji = b(ji+j) >*/
bji = b[ji + j];
/*< u1 = bjf + bji >*/
u1 = bjf + bji;
/*< bjg = b(jg+j) >*/
bjg = b[jg + j];
/*< u2 = bjg - 0.5 * u1 >*/
u2 = bjg - u1 * (float).5;
/*< u3 = c1 * ( bjf - bji ) >*/
u3 = c1 * (bjf - bji);
/*< u1 = bjg + u1 >*/
u1 = bjg + u1;
/*< b(jg+j) = bjc >*/
b[jg + j] = bjc;
/*< a(jc+j) = t1 >*/
a[jc + j] = t1;
/*< b(jc+j) = u1 >*/
b[jc + j] = u1;
/*< a(jf+j) = t2 - u3 >*/
a[jf + j] = t2 - u3;
/*< b(jf+j) = u2 + t3 >*/
b[jf + j] = u2 + t3;
/*< a(ji+j) = t2 + u3 >*/
a[ji + j] = t2 + u3;
/*< b(ji+j) = u2 - t3 >*/
b[ji + j] = u2 - t3;
/*< j = j + jump >*/
j += *jump;
/*< 410 continue >*/
/* L410: */
}
/* -----( end of loop across transforms ) */
/*< ja = ja + jstepx >*/
ja += jstepx;
/*< if (ja.lt.istart) ja = ja + ninc >*/
if (ja < istart) {
ja += ninc;
}
/*< 415 continue >*/
/* L415: */
}
/*< 420 continue >*/
/* L420: */
}
/*< 430 continue >*/
/* L430: */
}
/* -----( end of double loop for k=0 ) */
/* finished if last pass */
/* --------------------- */
/*< if (ipass.eq.m) go to 490 >*/
if (ipass == m) {
goto L490;
}
/*< kk = 2*la >*/
kk = la << 1;
/* loop on nonzero k */
/* ----------------- */
/*< do 470 k = ink , jstep-ink , ink >*/
i__4 = jstep - ink;
i__3 = ink;
for (k = ink; i__3 < 0 ? k >= i__4 : k <= i__4; k += i__3) {
/*< co1 = trigs(kk+1) >*/
co1 = trigs[kk + 1];
/*< si1 = s*trigs(kk+2) >*/
si1 = s * trigs[kk + 2];
/*< co2 = trigs(2*kk+1) >*/
co2 = trigs[(kk << 1) + 1];
/*< si2 = s*trigs(2*kk+2) >*/
si2 = s * trigs[(kk << 1) + 2];
/* double loop along first transform in block */
/* ------------------------------------------ */
/*< do 460 ll = k , (la-1)*ink , 3*jstep >*/
i__5 = (la - 1) * ink;
i__6 = jstep * 3;
for (ll = k; i__6 < 0 ? ll >= i__5 : ll <= i__5; ll += i__6) {
/*< do 450 jjj = ll , (n-1)*inc , 3*la*ink >*/
i__7 = (*n - 1) * *inc;
i__8 = la * 3 * ink;
for (jjj = ll; i__8 < 0 ? jjj >= i__7 : jjj <= i__7; jjj
+= i__8) {
/*< ja = istart + jjj >*/
ja = istart + jjj;
/* "transverse" loop */
/* ----------------- */
/*< do 445 nu = 1 , inq >*/
i__9 = inq;
for (nu = 1; nu <= i__9; ++nu) {
/*< jb = ja + jstepl >*/
jb = ja + jstepl;
/*< if (jb.lt.istart) jb = jb + ninc >*/
if (jb < istart) {
jb += ninc;
}
/*< jc = jb + jstepl >*/
jc = jb + jstepl;
/*< if (jc.lt.istart) jc = jc + ninc >*/
if (jc < istart) {
jc += ninc;
}
/*< jd = ja + laincl >*/
jd = ja + laincl;
/*< if (jd.lt.istart) jd = jd + ninc >*/
if (jd < istart) {
jd += ninc;
}
/*< je = jd + jstepl >*/
je = jd + jstepl;
/*< if (je.lt.istart) je = je + ninc >*/
if (je < istart) {
je += ninc;
}
/*< jf = je + jstepl >*/
jf = je + jstepl;
/*< if (jf.lt.istart) jf = jf + ninc >*/
if (jf < istart) {
jf += ninc;
}
/*< jg = jd + laincl >*/
jg = jd + laincl;
/*< if (jg.lt.istart) jg = jg + ninc >*/
if (jg < istart) {
jg += ninc;
}
/*< jh = jg + jstepl >*/
jh = jg + jstepl;
/*< if (jh.lt.istart) jh = jh + ninc >*/
if (jh < istart) {
jh += ninc;
}
/*< ji = jh + jstepl >*/
ji = jh + jstepl;
/*< if (ji.lt.istart) ji = ji + ninc >*/
if (ji < istart) {
ji += ninc;
}
/*< j = 0 >*/
j = 0;
/* loop across transforms */
/* ---------------------- */
/* dir$ ivdep, shortloop */
/*< do 440 l = 1 , nvex >*/
i__10 = nvex;
for (l = 1; l <= i__10; ++l) {
/*< ajb = a(jb+j) >*/
ajb = a[jb + j];
/*< ajc = a(jc+j) >*/
ajc = a[jc + j];
/*< t1 = ajb + ajc >*/
t1 = ajb + ajc;
/*< aja = a(ja+j) >*/
aja = a[ja + j];
/*< t2 = aja - 0.5 * t1 >*/
t2 = aja - t1 * (float).5;
/*< t3 = c1 * ( ajb - ajc ) >*/
t3 = c1 * (ajb - ajc);
/*< ajd = a(jd+j) >*/
ajd = a[jd + j];
/*< ajb = ajd >*/
ajb = ajd;
/*< bjb = b(jb+j) >*/
bjb = b[jb + j];
/*< bjc = b(jc+j) >*/
bjc = b[jc + j];
/*< u1 = bjb + bjc >*/
u1 = bjb + bjc;
/*< bja = b(ja+j) >*/
bja = b[ja + j];
/*< u2 = bja - 0.5 * u1 >*/
u2 = bja - u1 * (float).5;
/*< u3 = c1 * ( bjb - bjc ) >*/
u3 = c1 * (bjb - bjc);
/*< bjd = b(jd+j) >*/
bjd = b[jd + j];
/*< bjb = bjd >*/
bjb = bjd;
/*< a(ja+j) = aja + t1 >*/
a[ja + j] = aja + t1;
/*< b(ja+j) = bja + u1 >*/
b[ja + j] = bja + u1;
/*< a(jd+j) = co1*(t2-u3) - si1*(u2+t3) >*/
a[jd + j] = co1 * (t2 - u3) - si1 * (u2 + t3);
/*< b(jd+j) = si1*(t2-u3) + co1*(u2+t3) >*/
b[jd + j] = si1 * (t2 - u3) + co1 * (u2 + t3);
/*< ajc = co2*(t2+u3) - si2*(u2-t3) >*/
ajc = co2 * (t2 + u3) - si2 * (u2 - t3);
/*< bjc = si2*(t2+u3) + co2*(u2-t3) >*/
bjc = si2 * (t2 + u3) + co2 * (u2 - t3);
/* ---------------------- */
/*< aje = a(je+j) >*/
aje = a[je + j];
/*< ajf = a(jf+j) >*/
ajf = a[jf + j];
/*< t1 = aje + ajf >*/
t1 = aje + ajf;
/*< t2 = ajb - 0.5 * t1 >*/
t2 = ajb - t1 * (float).5;
/*< t3 = c1 * ( aje - ajf ) >*/
t3 = c1 * (aje - ajf);
/*< ajh = a(jh+j) >*/
ajh = a[jh + j];
/*< ajf = ajh >*/
ajf = ajh;
/*< bje = b(je+j) >*/
bje = b[je + j];
/*< bjf = b(jf+j) >*/
bjf = b[jf + j];
/*< u1 = bje + bjf >*/
u1 = bje + bjf;
/*< u2 = bjb - 0.5 * u1 >*/
u2 = bjb - u1 * (float).5;
/*< u3 = c1 * ( bje - bjf ) >*/
u3 = c1 * (bje - bjf);
/*< bjh = b(jh+j) >*/
bjh = b[jh + j];
/*< bjf = bjh >*/
bjf = bjh;
/*< a(jb+j) = ajb + t1 >*/
a[jb + j] = ajb + t1;
/*< b(jb+j) = bjb + u1 >*/
b[jb + j] = bjb + u1;
/*< a(je+j) = co1*(t2-u3) - si1*(u2+t3) >*/
a[je + j] = co1 * (t2 - u3) - si1 * (u2 + t3);
/*< b(je+j) = si1*(t2-u3) + co1*(u2+t3) >*/
b[je + j] = si1 * (t2 - u3) + co1 * (u2 + t3);
/*< a(jh+j) = co2*(t2+u3) - si2*(u2-t3) >*/
a[jh + j] = co2 * (t2 + u3) - si2 * (u2 - t3);
/*< b(jh+j) = si2*(t2+u3) + co2*(u2-t3) >*/
b[jh + j] = si2 * (t2 + u3) + co2 * (u2 - t3);
/* ---------------------- */
/*< aji = a(ji+j) >*/
aji = a[ji + j];
/*< t1 = ajf + aji >*/
t1 = ajf + aji;
/*< ajg = a(jg+j) >*/
ajg = a[jg + j];
/*< t2 = ajg - 0.5 * t1 >*/
t2 = ajg - t1 * (float).5;
/*< t3 = c1 * ( ajf - aji ) >*/
t3 = c1 * (ajf - aji);
/*< t1 = ajg + t1 >*/
t1 = ajg + t1;
/*< a(jg+j) = ajc >*/
a[jg + j] = ajc;
/*< bji = b(ji+j) >*/
bji = b[ji + j];
/*< u1 = bjf + bji >*/
u1 = bjf + bji;
/*< bjg = b(jg+j) >*/
bjg = b[jg + j];
/*< u2 = bjg - 0.5 * u1 >*/
u2 = bjg - u1 * (float).5;
/*< u3 = c1 * ( bjf - bji ) >*/
u3 = c1 * (bjf - bji);
/*< u1 = bjg + u1 >*/
u1 = bjg + u1;
/*< b(jg+j) = bjc >*/
b[jg + j] = bjc;
/*< a(jc+j) = t1 >*/
a[jc + j] = t1;
/*< b(jc+j) = u1 >*/
b[jc + j] = u1;
/*< a(jf+j) = co1*(t2-u3) - si1*(u2+t3) >*/
a[jf + j] = co1 * (t2 - u3) - si1 * (u2 + t3);
/*< b(jf+j) = si1*(t2-u3) + co1*(u2+t3) >*/
b[jf + j] = si1 * (t2 - u3) + co1 * (u2 + t3);
/*< a(ji+j) = co2*(t2+u3) - si2*(u2-t3) >*/
a[ji + j] = co2 * (t2 + u3) - si2 * (u2 - t3);
/*< b(ji+j) = si2*(t2+u3) + co2*(u2-t3) >*/
b[ji + j] = si2 * (t2 + u3) + co2 * (u2 - t3);
/*< j = j + jump >*/
j += *jump;
/*< 440 continue >*/
/* L440: */
}
/* -----(end of loop across transforms) */
/*< ja = ja + jstepx >*/
ja += jstepx;
/*< if (ja.lt.istart) ja = ja + ninc >*/
if (ja < istart) {
ja += ninc;
}
/*< 445 continue >*/
/* L445: */
}
/*< 450 continue >*/
/* L450: */
}
/*< 460 continue >*/
/* L460: */
}
/* -----( end of double loop for this k ) */
/*< kk = kk + 2*la >*/
kk += la << 1;
/*< 470 continue >*/
/* L470: */
}
/* -----( end of loop over values of k ) */
/*< la = 3*la >*/
la *= 3;
/*< 480 continue >*/
/* L480: */
}
/* -----( end of loop on type II radix-3 passes ) */
/* -----( nvex transforms completed) */
/*< 490 continue >*/
L490:
/*< istart = istart + nvex * jump >*/
istart += nvex * *jump;
/*< 500 continue >*/
/* L500: */
}
/* -----( end of loop on blocks of transforms ) */
/*< return >*/
return 0;
/*< end >*/
} /* dgpfa3f_ */
#ifdef __cplusplus
}
#endif
|
