dnl Alpha mpn_mod_34lsub1.
dnl Copyright 2002 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: 4 (?)
C EV5: 2.67
C EV6: 1.67
dnl INPUT PARAMETERS
dnl up r16
dnl n r17
define(`l0',`r18')
define(`l1',`r19')
define(`l2',`r20')
define(`a0',`r21')
define(`a1',`r22')
define(`a2',`r23')
define(`c0',`r24')
define(`c1',`r5')
define(`c2',`r6')
ASM_START()
PROLOGUE(mpn_mod_34lsub1)
bis r31, r31, c0
bis r31, r31, c1
bis r31, r31, c2
lda r17, -3(r17)
bge r17, $L_3_or_more
bis r31, r31, a0
bis r31, r31, a1
bis r31, r31, a2
br r31, $L_012
$L_3_or_more:
ldq a0, 0(r16)
ldq a1, 8(r16)
ldq a2, 16(r16)
lda r16, 24(r16)
lda r17, -3(r17)
blt r17, $L_012
$L_6_or_more:
ldq l0, 0(r16)
ldq l1, 8(r16)
ldq l2, 16(r16)
addq l0, a0, a0
lda r16, 24(r16)
lda r17, -3(r17)
blt r17, $L_end
ALIGN(16)
C Main loop
$L_9_or_more:
$Loop: cmpult a0, l0, r0
ldq l0, 0(r16)
addq r0, c0, c0
addq l1, a1, a1
cmpult a1, l1, r0
ldq l1, 8(r16)
addq r0, c1, c1
addq l2, a2, a2
cmpult a2, l2, r0
ldq l2, 16(r16)
addq r0, c2, c2
addq l0, a0, a0
lda r16, 24(r16)
lda r17, -3(r17)
bge r17, $Loop
$L_end: cmpult a0, l0, r0
addq r0, c0, c0
addq l1, a1, a1
cmpult a1, l1, r0
addq r0, c1, c1
addq l2, a2, a2
cmpult a2, l2, r0
addq r0, c2, c2
C Handle the last (n mod 3) limbs
$L_012: lda r17, 2(r17)
blt r17, $L_0
ldq l0, 0(r16)
addq l0, a0, a0
cmpult a0, l0, r0
addq r0, c0, c0
beq r17, $L_0
ldq l1, 8(r16)
addq l1, a1, a1
cmpult a1, l1, r0
addq r0, c1, c1
C Align and sum our 3 main accumulators and 3 carry accumulators
$L_0: srl a0, 48, r2
srl a1, 32, r4
ifdef(`HAVE_LIMB_LITTLE_ENDIAN',
` insll a1, 2, r1', C (a1 & 0xffffffff) << 16
` zapnot a1, 15, r25
sll r25, 16, r1')
zapnot a0, 63, r0 C a0 & 0xffffffffffff
srl a2, 16, a1
ifdef(`HAVE_LIMB_LITTLE_ENDIAN',
` inswl a2, 4, r3', C (a2 & 0xffff) << 32
` zapnot a2, 3, r25
sll r25, 32, r3')
addq r1, r4, r1
addq r0, r2, r0
srl c0, 32, a2
ifdef(`HAVE_LIMB_LITTLE_ENDIAN',
` insll c0, 2, r4', C (c0 & 0xffffffff) << 16
` zapnot c0, 15, r25
sll r25, 16, r4')
addq r0, r1, r0
addq r3, a1, r3
addq r0, r3, r0
srl c1, 16, c0
ifdef(`HAVE_LIMB_LITTLE_ENDIAN',
` inswl c1, 4, r2', C (c1 & 0xffff) << 32
` zapnot c1, 3, r25
sll r25, 32, r2')
addq r4, a2, r4
C srl c2, 48, r3 C This will be 0 in practise
zapnot c2, 63, r1 C r1 = c2 & 0xffffffffffff
addq r0, r4, r0
addq r2, c0, r2
addq r0, r2, r0
C addq r1, r3, r1
addq r0, r1, r0
ret r31, (r26), 1
EPILOGUE(mpn_mod_34lsub1)
ASM_END()