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dnl Power9 mpn_mul_2.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2018 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 power9: 1.58
C STATUS
C * Not written with any power9 pipeline understanding.
C * The 4x unrolling was not motivated by any timing tests.
C * No local scheduling for performance tweaking has been done.
C * Decrease load scheduling!
define(`rp', `r3')
define(`up', `r4')
define(`n', `r5') C Note: Reused as scratch
define(`vp', `r6') C Note: Reused for v1
define(`v0', `r7')
define(`v1', `r6')
ASM_START()
PROLOGUE(mpn_mul_2)
std r28, -32(r1)
std r29, -24(r1)
std r30, -16(r1)
std r31, -8(r1)
subfic r0, n, 0 C clear CA
subfo r0, r0, r0 C clear OV and r0
cmpdi cr7, n, 4
ld v0, 0(vp)
ld v1, 8(vp)
srdi r10, n, 2
mtctr r10
rldicl. r9, n, 0, 63
bne cr0, L(bx1)
L(bx0): rldicl. r9, n, 63, 63
ld r8, 0(up)
ld r9, 8(up)
li r11, 0
mulld r28, r8, v0
mulhdu r31, r8, v0
blt cr7, L(2)
mulld r5, r8, v1
mulhdu r10, r8, v1
bne cr0, L(b10)
L(b00): addi up, up, -8
addi rp, rp, -24
b L(lo0)
L(b10): addi up, up, 8
addi rp, rp, -8
b L(lo2)
L(2): addi rp, rp, -8
mulld r5, r8, v1
mulhdu r10, r8, v1
b L(cj2)
L(bx1): rldicl. r9, n, 63, 63
ld r9, 0(up)
ld r8, 8(up)
li r10, 0
mulld r29, r9, v0
mulhdu r30, r9, v0
mulld r12, r9, v1
mulhdu r11, r9, v1
bne cr0, L(b11)
L(b01): addi rp, rp, -16
b L(lo1)
L(b11): addi up, up, 16
blt cr7, L(end)
L(top): ld r9, 0(up)
maddld( r28, r8, v0, r10) C 0 4 -> adde
maddhdu(r31, r8, v0, r10) C 1 5
adde r0, r29, r0 C 7 11
std r0, 0(rp)
mulld r5, r8, v1 C 1 5 -> addex
mulhdu r10, r8, v1 C 2 6
addex( r0, r12, r30, 0) C 8 12
L(lo2): ld r8, 8(up)
maddld( r29, r9, v0, r11) C 1 5 -> adde
maddhdu(r30, r9, v0, r11) C 2 6
adde r0, r28, r0 C 8 12
std r0, 8(rp)
mulld r12, r9, v1 C 2 6 -> addex
mulhdu r11, r9, v1 C 3 7
addex( r0, r5, r31, 0) C 5 9 13
L(lo1): ld r9, 16(up)
maddld( r28, r8, v0, r10) C 2 6 -> adde
maddhdu(r31, r8, v0, r10) C 3 7
adde r0, r29, r0 C 5 9 13
std r0, 16(rp)
mulld r5, r8, v1 C 3 7 -> addex
mulhdu r10, r8, v1 C 4 8
addex( r0, r12, r30, 0) C 6 10
L(lo0): ld r8, 24(up)
maddld( r29, r9, v0, r11) C 3 7 -> adde
maddhdu(r30, r9, v0, r11) C 4 8
adde r0, r28, r0 C 6 10
std r0, 24(rp)
mulld r12, r9, v1 C 4 8 -> addex
mulhdu r11, r9, v1 C 5 9
addex( r0, r5, r31, 0) C 7 11
addi up, up, 32
addi rp, rp, 32
bdnz L(top)
L(end): ld r9, 0(up)
maddld( r28, r8, v0, r10) C 0 4
maddhdu(r31, r8, v0, r10) C 1 5
adde r0, r29, r0 C 7 11
std r0, 0(rp) C -4
mulld r5, r8, v1 C 1 5
mulhdu r10, r8, v1 C 2 6
addex( r0, r12, r30, 0) C 8 12
L(cj2): maddld( r29, r9, v0, r11) C 1 5 -2
maddhdu(r30, r9, v0, r11) C 2 6 -1
adde r0, r28, r0 C 8 12 -3
std r0, 8(rp) C -3
mulld r12, r9, v1 C 2 6 -1
mulhdu r11, r9, v1 C 3 7 0 = return limb
addex( r0, r5, r31, 0) C 5 9 13
adde r0, r29, r0 C 5 9 13 -2
std r0, 16(rp) C -2
addex( r0, r12, r30, 0) C 6 10 -1
adde r0, r0, r10 C -1
std r0, 24(rp) C -1
li r4, 0
addze r3, r11
addex( r3, r3, r4, 0)
L(ret): ld r28, -32(r1)
ld r29, -24(r1)
ld r30, -16(r1)
ld r31, -8(r1)
blr
EPILOGUE()
ASM_END()
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