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dnl Alpha mpn_sqr_diag_addlsh1.
dnl Copyright 2013 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 EV4: ?
C EV5: 10.2
C EV6: 4.5
C Ideally, one-way code could run at 9 c/l (limited by mulq+umulh) on ev5 and
C about 3.75 c/l on ev6. Two-way code could run at about 3.25 c/l on ev6.
C Algorithm: We allow ourselves to propagate carry to a product high word
C without worrying for carry out, since (B-1)^2 = B^2-2B+1 has a high word of
C B-2, i.e, will not spill. We propagate carry similarly to a product low word
C since the problem value B-1 is a quadratic non-residue mod B, but our
C products are squares.
define(`rp', `r16')
define(`tp', `r17')
define(`up', `r18')
define(`n', `r19')
ASM_START()
PROLOGUE(mpn_sqr_diag_addlsh1)
ldq r0, 0(up)
bis r31, r31, r21
bis r31, r31, r3
mulq r0, r0, r7
stq r7, 0(rp)
umulh r0, r0, r6
lda n, -1(n)
ALIGN(16)
L(top): ldq r0, 8(up)
lda up, 8(up)
ldq r8, 0(tp)
ldq r20, 8(tp)
mulq r0, r0, r7
lda tp, 16(tp)
sll r8, 1, r23
srl r8, 63, r22
or r21, r23, r23
sll r20, 1, r24
addq r3, r6, r6 C cannot carry per comment above
or r22, r24, r24
addq r23, r6, r21
umulh r0, r0, r6
cmpult r21, r23, r1
addq r1, r7, r7 C cannot carry per comment above
stq r21, 8(rp)
addq r24, r7, r22
stq r22, 16(rp)
lda n, -1(n)
cmpult r22, r7, r3
srl r20, 63, r21
lda rp, 16(rp)
bne n, L(top)
addq r3, r6, r6 C cannot carry per comment above
addq r21, r6, r21
stq r21, 8(rp)
ret r31, (r26), 1
EPILOGUE()
ASM_END()
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