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dnl SPARC v9 mpn_rshift
dnl Copyright 1996, 2000, 2001, 2002, 2003 Free Software Foundation, 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 UltraSPARC 1&2: 2
C UltraSPARC 3: 3.25
C INPUT PARAMETERS
define(`rp',`%i0')
define(`up',`%i1')
define(`n',`%i2')
define(`cnt',`%i3')
define(`u0',`%l0')
define(`u1',`%l2')
define(`u2',`%l4')
define(`u3',`%l6')
define(`tnc',`%i4')
define(`fanop',`fitod %f0,%f2') dnl A quasi nop running in the FA pipe
define(`fmnop',`fmuld %f0,%f0,%f4') dnl A quasi nop running in the FM pipe
ASM_START()
REGISTER(%g2,#scratch)
REGISTER(%g3,#scratch)
PROLOGUE(mpn_rshift)
save %sp,-160,%sp
sub %g0,cnt,tnc C negate shift count
ldx [up],u3 C load first limb
subcc n,5,n
sllx u3,tnc,%i5 C compute function result
srlx u3,cnt,%g3
bl,pn %icc,.Lend1234
fanop
subcc n,4,n
ldx [up+8],u0
ldx [up+16],u1
add up,32,up
ldx [up-8],u2
ldx [up+0],u3
sllx u0,tnc,%g2
bl,pn %icc,.Lend5678
fanop
b,a .Loop
.align 16
.Loop:
srlx u0,cnt,%g1
or %g3,%g2,%g3
ldx [up+8],u0
fanop
C --
sllx u1,tnc,%g2
subcc n,4,n
stx %g3,[rp+0]
fanop
C --
srlx u1,cnt,%g3
or %g1,%g2,%g1
ldx [up+16],u1
fanop
C --
sllx u2,tnc,%g2
stx %g1,[rp+8]
add up,32,up
fanop
C --
srlx u2,cnt,%g1
or %g3,%g2,%g3
ldx [up-8],u2
fanop
C --
sllx u3,tnc,%g2
stx %g3,[rp+16]
add rp,32,rp
fanop
C --
srlx u3,cnt,%g3
or %g1,%g2,%g1
ldx [up+0],u3
fanop
C --
sllx u0,tnc,%g2
stx %g1,[rp-8]
bge,pt %icc,.Loop
fanop
C --
.Lend5678:
srlx u0,cnt,%g1
or %g3,%g2,%g3
sllx u1,tnc,%g2
stx %g3,[rp+0]
srlx u1,cnt,%g3
or %g1,%g2,%g1
sllx u2,tnc,%g2
stx %g1,[rp+8]
srlx u2,cnt,%g1
or %g3,%g2,%g3
sllx u3,tnc,%g2
stx %g3,[rp+16]
add rp,32,rp
srlx u3,cnt,%g3 C carry...
or %g1,%g2,%g1
stx %g1,[rp-8]
.Lend1234:
addcc n,4,n
bz,pn %icc,.Lret
fanop
.Loop0:
add rp,8,rp
subcc n,1,n
ldx [up+8],u3
add up,8,up
sllx u3,tnc,%g2
or %g3,%g2,%g3
stx %g3,[rp-8]
srlx u3,cnt,%g3
bnz,pt %icc,.Loop0
fanop
.Lret:
stx %g3,[rp+0]
mov %i5,%i0
ret
restore
EPILOGUE(mpn_rshift)
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