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dnl PPC64 mpn_bdiv_dbm1c.
dnl Copyright 2008, 2010 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C POWER3/PPC630 6-18
C POWER4/PPC970 8.5?
C POWER5 8.5 fluctuating as function of n % 3
C POWER6 15
C TODO
C * Nothing to do...
C INPUT PARAMETERS
define(`rp', `r3')
define(`up', `r4')
define(`n', `r5')
define(`bd', `r6')
define(`cy', `r7')
ASM_START()
PROLOGUE(mpn_bdiv_dbm1c)
ld r0, 0(r4)
rldicl. r12, r5, 0,62
cmpldi cr6, r12, 2
cmpldi cr7, r5, 4
addi r5, r5, 1
srwi r5, r5, 2
mtctr r5
beq cr0, L(b00)
blt cr6, L(b01)
beq cr6, L(b10)
ALIGN(16)
L(b11): mulld r5, r0, r6
mulhdu r12, r0, r6
ld r0, 8(r4)
addi r4, r4, -24
addi r3, r3, -24
b L(3)
ALIGN(16)
L(b00): mulld r9, r0, r6
mulhdu r8, r0, r6
addi r4, r4, -16
addi r3, r3, -16
b L(0)
ALIGN(16)
L(b01): mulld r5, r0, r6
mulhdu r12, r0, r6
addi r3, r3, -8
ble cr7, L(e1)
ld r0, 8(r4)
addi r4, r4, -8
b L(1)
ALIGN(16)
L(b10): mulld r9, r0, r6
mulhdu r8, r0, r6
ble cr7, L(e2)
ALIGN(16)
L(top): subfc r11, r9, r7
ld r10, 8(r4)
ld r0, 16(r4)
subfe r7, r8, r11
std r11, 0(r3)
mulld r5, r10, r6
mulhdu r12, r10, r6
L(1): mulld r9, r0, r6
mulhdu r8, r0, r6
subfc r11, r5, r7
subfe r7, r12, r11
std r11, 8(r3)
L(0): subfc r11, r9, r7
ld r10, 24(r4)
ld r0, 32(r4)
subfe r7, r8, r11
std r11, 16(r3)
mulld r5, r10, r6
mulhdu r12, r10, r6
L(3): mulld r9, r0, r6
mulhdu r8, r0, r6
subfc r11, r5, r7
subfe r7, r12, r11
std r11, 24(r3)
addi r4, r4, 32
addi r3, r3, 32
bdnz L(top)
L(e2): ld r10, 8(r4)
mulld r5, r10, r6
mulhdu r12, r10, r6
subfc r11, r9, r7
subfe r7, r8, r11
std r11, 0(r3)
L(e1): subfc r11, r5, r7
std r11, 8(r3)
subfe r3, r12, r11
blr
EPILOGUE()
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