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dnl IA-64 mpn_popcount -- mpn population count.
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
dnl Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C Itanium: 1.5
C Itanium 2: 1
C INPUT PARAMETERS
define(`up', `r32')
define(`n', `r33')
define(`u0',`r16') define(`u1',`r17') define(`u2',`r18') define(`u3',`r19')
define(`c0',`r28') define(`c1',`r29') define(`c2',`r30') define(`c3',`r31')
define(`s',`r8')
ASM_START()
PROLOGUE(mpn_popcount)
.prologue
ifdef(`HAVE_ABI_32',
` addp4 up = 0, up C M I
zxt4 n = n C I
;;
')
{.mmi; add r9 = 512, up C prefetch pointer M I
ld8 r10 = [up], 8 C load first limb M01
mov.i r2 = ar.lc C save ar.lc I0
}{.mmi; and r14 = 3, n C M I
cmp.lt p15, p14 = 4, n C small count? M I
add n = -5, n C M I
;;
}{.mmi; cmp.eq p6, p0 = 1, r14 C M I
cmp.eq p7, p0 = 2, r14 C M I
cmp.eq p8, p0 = 3, r14 C M I
}{.bbb
(p6) br.dptk .Lb01 C B
(p7) br.dptk .Lb10 C B
(p8) br.dptk .Lb11 C B
}
.Lb00: ld8 u1 = [up], 8 C M01
shr.u n = n, 2 C I0
mov s = 0 C M I
;;
ld8 u2 = [up], 8 C M01
popcnt c0 = r10 C I0
mov.i ar.lc = n C I0
;;
ld8 u3 = [up], 8 C M01
popcnt c1 = u1 C I0
(p15) br.cond.dptk .grt4 C B
;;
nop.m 0 C -
nop.m 0 C -
popcnt c2 = u2 C I0
;;
mov s = c0 C M I
popcnt c3 = u3 C I0
br .Lcj4 C B
.grt4: ld8 u0 = [up], 8 C M01
popcnt c2 = u2 C I0
br .LL00 C B
.Lb01:
popcnt s = r10 C I0
(p14) br.ret.sptk.many b0 C B
.grt1: ld8 u0 = [up], 8 C M01
shr.u n = n, 2 C I0
;;
ld8 u1 = [up], 8 C M01
mov.i ar.lc = n C I0
;;
ld8 u2 = [up], 8 C M01
popcnt c0 = u0 C I0
mov c3 = 0 C I0
;;
ld8 u3 = [up], 8 C M01
popcnt c1 = u1 C I0
br.cloop.dptk .Loop C B
br .Lend C B
.Lb10: ld8 u3 = [up], 8 C M01
shr.u n = n, 2 C I0
(p15) br.cond.dptk .grt2 C B
popcnt s = r10 C I0
;;
popcnt c3 = u3 C I0
br .Lcj2 C B
.grt2: ld8 u0 = [up], 8 C M01
mov.i ar.lc = n C I0
popcnt c2 = r10 C I0
;;
ld8 u1 = [up], 8 C M01
popcnt c3 = u3 C I0
mov s = 0 C M I
;;
ld8 u2 = [up], 8 C M01
popcnt c0 = u0 C I0
br .LL10 C B
.Lb11: ld8 u2 = [up], 8 C M01
shr.u n = n, 2 C I0
mov s = 0 C M I
;;
ld8 u3 = [up], 8 C M01
popcnt s = r10 C I0
(p15) br.cond.dptk .grt3 C B
popcnt c2 = u2 C I0
;;
popcnt c3 = u3 C I0
br .Lcj3 C B
.grt3: ld8 u0 = [up], 8 C M01
popcnt c2 = u2 C I0
mov.i ar.lc = n C I0
mov c1 = 0
;;
ld8 u1 = [up], 8 C M01
popcnt c3 = u3 C I0
br .LL11 C B
.Loop: ld8 u0 = [up], 8 C M01
popcnt c2 = u2 C I0
add s = s, c3 C M I
;;
.LL00: ld8 u1 = [up], 8 C M01
popcnt c3 = u3 C I0
add s = s, c0 C M I
;;
.LL11: ld8 u2 = [up], 8 C M01
popcnt c0 = u0 C I0
add s = s, c1 C M I
;;
.LL10: ld8 u3 = [up], 8 C M01
popcnt c1 = u1 C I0
add s = s, c2 C M I
lfetch [r9], 32 C M01
nop.m 0 C -
br.cloop.dptk .Loop C B
;;
.Lend: popcnt c2 = u2 C I0
add s = s, c3 C M I
;;
popcnt c3 = u3 C I0
add s = s, c0 C M I
;;
.Lcj4: add s = s, c1 C M I
;;
.Lcj3: add s = s, c2 C M I
;;
.Lcj2: add s = s, c3 C M I
mov.i ar.lc = r2 C I0
br.ret.sptk.many b0 C B
EPILOGUE()
ASM_END()
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