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dnl HP-PA 7100/7200 mpn_submul_1 -- Multiply a limb vector with a limb and
dnl subtract the result from a second limb vector.
dnl Copyright 1995, 2000-2003 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 INPUT PARAMETERS
define(`res_ptr',`%r26')
define(`s1_ptr',`%r25')
define(`size_param',`%r24')
define(`s2_limb',`%r23')
define(`cylimb',`%r28')
define(`s0',`%r19')
define(`s1',`%r20')
define(`s2',`%r3')
define(`s3',`%r4')
define(`lo0',`%r21')
define(`lo1',`%r5')
define(`lo2',`%r6')
define(`lo3',`%r7')
define(`hi0',`%r22')
define(`hi1',`%r23') C safe to reuse
define(`hi2',`%r29')
define(`hi3',`%r1')
ASM_START()
PROLOGUE(mpn_submul_1)
C .callinfo frame=128,no_calls
ldo 128(%r30),%r30
stws s2_limb,-16(%r30)
add %r0,%r0,cylimb C clear cy and cylimb
addib,< -4,size_param,L(few_limbs)
fldws -16(%r30),%fr31R
ldo -112(%r30),%r31
stw %r3,-96(%r30)
stw %r4,-92(%r30)
stw %r5,-88(%r30)
stw %r6,-84(%r30)
stw %r7,-80(%r30)
bb,>=,n s1_ptr,29,L(0)
fldws,ma 4(s1_ptr),%fr4
ldws 0(res_ptr),s0
xmpyu %fr4,%fr31R,%fr5
fstds %fr5,-16(%r31)
ldws -16(%r31),cylimb
ldws -12(%r31),lo0
sub s0,lo0,s0
add s0,lo0,%r0 C invert cy
addib,< -1,size_param,L(few_limbs)
stws,ma s0,4(res_ptr)
C start software pipeline ----------------------------------------------------
LDEF(0)
fldds,ma 8(s1_ptr),%fr4
fldds,ma 8(s1_ptr),%fr8
xmpyu %fr4L,%fr31R,%fr5
xmpyu %fr4R,%fr31R,%fr6
xmpyu %fr8L,%fr31R,%fr9
xmpyu %fr8R,%fr31R,%fr10
fstds %fr5,-16(%r31)
fstds %fr6,-8(%r31)
fstds %fr9,0(%r31)
fstds %fr10,8(%r31)
ldws -16(%r31),hi0
ldws -12(%r31),lo0
ldws -8(%r31),hi1
ldws -4(%r31),lo1
ldws 0(%r31),hi2
ldws 4(%r31),lo2
ldws 8(%r31),hi3
ldws 12(%r31),lo3
addc lo0,cylimb,lo0
addc lo1,hi0,lo1
addc lo2,hi1,lo2
addc lo3,hi2,lo3
addib,< -4,size_param,L(end)
addc %r0,hi3,cylimb C propagate carry into cylimb
C main loop ------------------------------------------------------------------
LDEF(loop)
fldds,ma 8(s1_ptr),%fr4
fldds,ma 8(s1_ptr),%fr8
ldws 0(res_ptr),s0
xmpyu %fr4L,%fr31R,%fr5
ldws 4(res_ptr),s1
xmpyu %fr4R,%fr31R,%fr6
ldws 8(res_ptr),s2
xmpyu %fr8L,%fr31R,%fr9
ldws 12(res_ptr),s3
xmpyu %fr8R,%fr31R,%fr10
fstds %fr5,-16(%r31)
sub s0,lo0,s0
fstds %fr6,-8(%r31)
subb s1,lo1,s1
fstds %fr9,0(%r31)
subb s2,lo2,s2
fstds %fr10,8(%r31)
subb s3,lo3,s3
subb %r0,%r0,lo0 C these two insns ...
add lo0,lo0,%r0 C ... just invert cy
ldws -16(%r31),hi0
ldws -12(%r31),lo0
ldws -8(%r31),hi1
ldws -4(%r31),lo1
ldws 0(%r31),hi2
ldws 4(%r31),lo2
ldws 8(%r31),hi3
ldws 12(%r31),lo3
addc lo0,cylimb,lo0
stws,ma s0,4(res_ptr)
addc lo1,hi0,lo1
stws,ma s1,4(res_ptr)
addc lo2,hi1,lo2
stws,ma s2,4(res_ptr)
addc lo3,hi2,lo3
stws,ma s3,4(res_ptr)
addib,>= -4,size_param,L(loop)
addc %r0,hi3,cylimb C propagate carry into cylimb
C finish software pipeline ---------------------------------------------------
LDEF(end)
ldws 0(res_ptr),s0
ldws 4(res_ptr),s1
ldws 8(res_ptr),s2
ldws 12(res_ptr),s3
sub s0,lo0,s0
stws,ma s0,4(res_ptr)
subb s1,lo1,s1
stws,ma s1,4(res_ptr)
subb s2,lo2,s2
stws,ma s2,4(res_ptr)
subb s3,lo3,s3
stws,ma s3,4(res_ptr)
subb %r0,%r0,lo0 C these two insns ...
add lo0,lo0,%r0 C ... invert cy
C restore callee-saves registers ---------------------------------------------
ldw -96(%r30),%r3
ldw -92(%r30),%r4
ldw -88(%r30),%r5
ldw -84(%r30),%r6
ldw -80(%r30),%r7
LDEF(few_limbs)
addib,=,n 4,size_param,L(ret)
LDEF(loop2)
fldws,ma 4(s1_ptr),%fr4
ldws 0(res_ptr),s0
xmpyu %fr4,%fr31R,%fr5
fstds %fr5,-16(%r30)
ldws -16(%r30),hi0
ldws -12(%r30),lo0
addc lo0,cylimb,lo0
addc %r0,hi0,cylimb
sub s0,lo0,s0
add s0,lo0,%r0 C invert cy
stws,ma s0,4(res_ptr)
addib,<> -1,size_param,L(loop2)
nop
LDEF(ret)
addc %r0,cylimb,cylimb
bv 0(%r2)
ldo -128(%r30),%r30
EPILOGUE(mpn_submul_1)
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