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dnl PowerPC-64 mpn_mul_1 -- Multiply a limb vector with a limb and store
dnl the result in a second limb vector.
dnl Copyright 1999-2001, 2003-2006, 2010 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 POWER3/PPC630 6-18
C POWER4/PPC970 7.25? not updated for last file revision
C POWER5 7.25
C POWER6 14
C POWER7 2.9
C TODO
C * Try to reduce the number of needed live registers (at least r5 and r10
C could be combined)
C * Optimize feed-in code, for speed and size.
C * Clean up r12/r7 usage in feed-in code.
C INPUT PARAMETERS
define(`rp', `r3')
define(`up', `r4')
define(`n', `r5')
define(`vl', `r6')
ASM_START()
PROLOGUE(mpn_mul_1c)
std r27, -40(r1)
std r26, -48(r1)
mr r12, r7
b L(ent)
EPILOGUE()
PROLOGUE(mpn_mul_1)
std r27, -40(r1)
std r26, -48(r1)
li r12, 0 C cy_limb = 0
L(ent): ld r26, 0(up)
rldicl. r0, n, 0,62 C r0 = n & 3, set cr0
cmpdi cr6, r0, 2
addic n, n, 3 C compute count...
srdi n, n, 2 C ...for ctr
mtctr n C copy count into ctr
beq cr0, L(b00)
blt cr6, L(b01)
beq cr6, L(b10)
L(b11): mr r7, r12
mulld r0, r26, r6
mulhdu r12, r26, r6
addi up, up, 8
addc r0, r0, r7
std r0, 0(rp)
addi rp, rp, 8
b L(fic)
L(b00): ld r27, 8(up)
addi up, up, 16
mulld r0, r26, r6
mulhdu r5, r26, r6
mulld r7, r27, r6
mulhdu r8, r27, r6
addc r0, r0, r12
adde r7, r7, r5
addze r12, r8
std r0, 0(rp)
std r7, 8(rp)
addi rp, rp, 16
b L(fic)
nop C alignment
L(b01): bdnz L(gt1)
mulld r0, r26, r6
mulhdu r8, r26, r6
addc r0, r0, r12
std r0, 0(rp)
b L(ret)
L(gt1): ld r27, 8(up)
nop
mulld r0, r26, r6
mulhdu r5, r26, r6
ld r26, 16(up)
mulld r7, r27, r6
mulhdu r8, r27, r6
mulld r9, r26, r6
mulhdu r10, r26, r6
addc r0, r0, r12
adde r7, r7, r5
adde r9, r9, r8
addze r12, r10
std r0, 0(rp)
std r7, 8(rp)
std r9, 16(rp)
addi up, up, 24
addi rp, rp, 24
b L(fic)
nop
L(fic): ld r26, 0(up)
L(b10): ld r27, 8(up)
addi up, up, 16
bdz L(end)
L(top): mulld r0, r26, r6
mulhdu r5, r26, r6
mulld r7, r27, r6
mulhdu r8, r27, r6
ld r26, 0(up)
ld r27, 8(up)
adde r0, r0, r12
adde r7, r7, r5
mulld r9, r26, r6
mulhdu r10, r26, r6
mulld r11, r27, r6
mulhdu r12, r27, r6
ld r26, 16(up)
ld r27, 24(up)
std r0, 0(rp)
adde r9, r9, r8
std r7, 8(rp)
adde r11, r11, r10
std r9, 16(rp)
addi up, up, 32
std r11, 24(rp)
addi rp, rp, 32
bdnz L(top)
L(end): mulld r0, r26, r6
mulhdu r5, r26, r6
mulld r7, r27, r6
mulhdu r8, r27, r6
adde r0, r0, r12
adde r7, r7, r5
std r0, 0(rp)
std r7, 8(rp)
L(ret): addze r3, r8
ld r27, -40(r1)
ld r26, -48(r1)
blr
EPILOGUE()
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