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dnl PowerPC-64 mpn_bdiv_q_1, mpn_pi1_bdiv_q_1 -- Hensel division by 1-limb
dnl divisor.
dnl Copyright 2006, 2010, 2017 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 norm unorm
C POWER3/PPC630 13-19
C POWER4/PPC970 16
C POWER5 16 16
C POWER6 37 46
C POWER7 12 12
C POWER8 12 12
C INPUT PARAMETERS
define(`rp', `r3')
define(`up', `r4')
define(`n', `r5')
define(`d', `r6')
define(`di', `r7')
define(`cnt',`r8')
define(`tnc',`r10')
ASM_START()
EXTERN(binvert_limb_table)
PROLOGUE(mpn_bdiv_q_1,toc)
addi r7, n, -1
cmpdi cr1, n, 1
ld r12, 0(up)
li cnt, 0
neg r0, d
and r0, d, r0
cntlzd r0, r0
subfic cnt, r0, 63
srd d, d, cnt
L(7):
mtctr r7
LEA( r10, binvert_limb_table)
rldicl r11, d, 63, 57
lbzx r0, r10, r11
mulld r9, r0, r0
sldi r0, r0, 1
mulld r9, d, r9
subf r0, r9, r0
mulld r10, r0, r0
sldi r0, r0, 1
mulld r10, d, r10
subf r0, r10, r0
mulld r9, r0, r0
sldi r0, r0, 1
mulld r9, d, r9
subf di, r9, r0 C di = 1/d mod 2^64
ifdef(`AIX',
` C For AIX it is not clear how to jump into another function.
b .mpn_pi1_bdiv_q_1
',`
C For non-AIX, dispatch into the pi1 variant.
bne cr0, L(norm)
b L(unorm)
')
EPILOGUE()
PROLOGUE(mpn_pi1_bdiv_q_1)
cmpdi cr0, cnt, 0
ld r12, 0(up)
addic r0, n, -1 C set carry as side effect
cmpdi cr1, n, 1
mtctr r0
beq cr0, L(norm)
L(unorm):
subfic tnc, cnt, 64 C set carry as side effect
li r5, 0
srd r11, r12, cnt
beq cr1, L(ed1)
ALIGN(16)
L(tpu): ld r12, 8(up)
nop
addi up, up, 8
sld r0, r12, tnc
or r11, r11, r0
subfe r9, r5, r11
srd r11, r12, cnt
mulld r0, di, r9
mulhdu r5, r0, d
std r0, 0(rp)
addi rp, rp, 8
bdnz L(tpu)
subfe r11, r5, r11
L(ed1): mulld r0, di, r11
std r0, 0(rp)
blr
ALIGN(16)
L(norm):
mulld r11, r12, di
mulhdu r5, r11, d
std r11, 0(rp)
beqlr cr1
ALIGN(16)
L(tpn): ld r9, 8(up)
addi up, up, 8
subfe r5, r5, r9
mulld r11, di, r5
mulhdu r5, r11, d C result not used in last iteration
std r11, 8(rp)
addi rp, rp, 8
bdnz L(tpn)
blr
EPILOGUE()
ASM_END()
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