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dnl Alpha ev6 nails mpn_addmul_2.
dnl Copyright 2002, 2005, 2006 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 Runs at 4.0 cycles/limb.
C We could either go for 2-way unrolling over 11 cycles, or 2.75 c/l,
C or 4-way unrolling over 20 cycles, for 2.5 c/l.
C INPUT PARAMETERS
define(`rp',`r16')
define(`up',`r17')
define(`n',`r18')
define(`vp',`r19')
C Useful register aliases
define(`numb_mask',`r24')
define(`ulimb',`r25')
define(`rlimb',`r27')
define(`m0a',`r0')
define(`m0b',`r1')
define(`m1a',`r2')
define(`m1b',`r3')
define(`acc0',`r4')
define(`acc1',`r5')
define(`v0',`r6')
define(`v1',`r7')
C Used for temps: r8 r19 r28
define(`NAIL_BITS',`GMP_NAIL_BITS')
define(`NUMB_BITS',`GMP_NUMB_BITS')
C This declaration is munged by configure
NAILS_SUPPORT(3-63)
ASM_START()
PROLOGUE(mpn_addmul_2)
lda numb_mask,-1(r31)
srl numb_mask,NAIL_BITS,numb_mask
ldq v0, 0(vp)
ldq v1, 8(vp)
bis r31, r31, acc0 C zero acc0
sll v0,NAIL_BITS, v0
bis r31, r31, acc1 C zero acc1
sll v1,NAIL_BITS, v1
bis r31, r31, r19
ldq ulimb, 0(up)
lda up, 8(up)
mulq v0, ulimb, m0a C U1
umulh v0, ulimb, m0b C U1
mulq v1, ulimb, m1a C U1
umulh v1, ulimb, m1b C U1
lda n, -1(n)
beq n, L(end) C U0
ALIGN(16)
L(top): bis r31, r31, r31 C U1 nop
addq r19, acc0, acc0 C U0 propagate nail
ldq rlimb, 0(rp) C L0
ldq ulimb, 0(up) C L1
lda rp, 8(rp) C L1
srl m0a,NAIL_BITS, r8 C U0
lda up, 8(up) C L0
mulq v0, ulimb, m0a C U1
addq r8, acc0, r19 C U0
addq m0b, acc1, acc0 C L1
umulh v0, ulimb, m0b C U1
bis r31, r31, r31 C L0 nop
addq rlimb, r19, r19 C L1 FINAL PROD-SUM
srl m1a,NAIL_BITS, r8 C U0
lda n, -1(n) C L0
mulq v1, ulimb, m1a C U1
addq r8, acc0, acc0 C U0
bis r31, m1b, acc1 C L1
umulh v1, ulimb, m1b C U1
and r19,numb_mask, r28 C L0 extract numb part
unop
srl r19,NUMB_BITS, r19 C U1 extract nail part
stq r28, -8(rp) C L1
bne n, L(top) C U0
L(end): ldq rlimb, 0(rp)
addq r19, acc0, acc0 C propagate nail
lda rp, 8(rp)
srl m0a,NAIL_BITS, r8 C U0
addq r8, acc0, r19
addq m0b, acc1, acc0
addq rlimb, r19, r19
srl m1a,NAIL_BITS, r8 C U0
addq r8, acc0, acc0
bis r31, m1b, acc1
and r19,numb_mask, r28 C extract limb
srl r19,NUMB_BITS, r19 C extract nail
stq r28, -8(rp)
addq r19, acc0, acc0 C propagate nail
and acc0,numb_mask, r28
stq r28, 0(rp)
srl acc0,NUMB_BITS, r19
addq r19, acc1, r0
ret r31, (r26), 1
EPILOGUE()
ASM_END()
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