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dnl IA-64 mpn_sec_tabselect.
dnl Copyright 2011 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C Itanium: ?
C Itanium 2: 2.5
C NOTES
C * Using software pipelining could trivially yield 2 c/l without unrolling,
C or 1+epsilon with unrolling. (This code was modelled after the powerpc64
C code, for simplicity.)
C mpn_sec_tabselect (mp_limb_t *rp, mp_limb_t *tp, mp_size_t n, mp_size_t nents, mp_size_t which)
define(`rp', `r32')
define(`tp', `r33')
define(`n', `r34')
define(`nents', `r35')
define(`which', `r36')
define(`mask', `r8')
define(`rp1', `r32')
define(`tp1', `r33')
define(`rp2', `r14')
define(`tp2', `r15')
ASM_START()
PROLOGUE(mpn_sec_tabselect)
.prologue
.save ar.lc, r2
.body
ifdef(`HAVE_ABI_32',`
{.mmi; addp4 rp = 0, rp C M I
addp4 tp = 0, tp C M I
zxt4 n = n C I
}{.mii; nop 0
zxt4 nents = nents C I
zxt4 which = which C I
;;
}')
{.mmi; add rp2 = 8, rp1
add tp2 = 8, tp1
add r6 = -2, n
;;
}{.mmi; cmp.eq p10, p0 = 1, n
and r9 = 1, n C set cr0 for use in inner loop
shr.u r6 = r6, 1 C inner loop count
;;
}{.mmi; cmp.eq p8, p0 = 0, r9
sub which = nents, which
shl n = n, 3
;;
}
L(outer):
{.mmi; cmp.eq p6, p7 = which, nents C are we at the selected table entry?
nop 0
mov ar.lc = r6 C I0
;;
}{.mmb;
(p6) mov mask = -1
(p7) mov mask = 0
(p8) br.dptk L(top) C branch to loop entry if n even
;;
}{.mmi; ld8 r16 = [tp1], 8
add tp2 = 8, tp2
nop 0
;;
}{.mmi; ld8 r18 = [rp1]
and r16 = r16, mask
nop 0
;;
}{.mmi; andcm r18 = r18, mask
;;
or r16 = r16, r18
nop 0
;;
}{.mmb; st8 [rp1] = r16, 8
add rp2 = 8, rp2
(p10) br.dpnt L(end)
}
ALIGN(32)
L(top):
{.mmi; ld8 r16 = [tp1], 16
ld8 r17 = [tp2], 16
nop 0
;;
}{.mmi; ld8 r18 = [rp1]
and r16 = r16, mask
nop 0
}{.mmi; ld8 r19 = [rp2]
and r17 = r17, mask
nop 0
;;
}{.mmi; andcm r18 = r18, mask
andcm r19 = r19, mask
nop 0
;;
}{.mmi; or r16 = r16, r18
or r17 = r17, r19
nop 0
;;
}{.mmb; st8 [rp1] = r16, 16
st8 [rp2] = r17, 16
br.cloop.dptk L(top)
;;
}
L(end):
{.mmi; sub rp1 = rp1, n C move rp back to beginning
sub rp2 = rp2, n C move rp back to beginning
cmp.ne p9, p0 = 1, nents
}{.mmb; add nents = -1, nents
nop 0
(p9) br.dptk L(outer)
;;
}{.mib; nop 0
nop 0
br.ret.sptk.many b0
}
EPILOGUE()
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