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dnl RISC-V/64 mpn_rshift
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 2023 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 INPUT PARAMETERS
define(`rp_arg',`a0')
define(`ap', `a1')
define(`n', `a2')
define(`cnt', `a3')
define(`rp', `a4')
define(`tnc', `t5')
define(`i', `a7')
ASM_START()
PROLOGUE(mpn_rshift)
mv rp, rp_arg
sub tnc, x0, cnt
srli i, n, 2
ld t0, 0(ap)
sll a0, t0, tnc
andi t6, n, 1
andi a5, n, 2
bnez t6, L(bx1)
srl t3, t0, cnt
ld t0, 8(ap)
addi i, i, -1
bnez a5, L(b10)
addi rp, rp, -16
j L(b0)
L(b10): addi ap, ap, 16
bge i, x0, L(b2)
L(eq2): sll t4, t0, tnc
srl t2, t0, cnt
or t4, t3, t4
sd t4, (rp)
sd t2, 8(rp)
ret
L(bx1): srl t2, t0, cnt
bnez a5, L(b11)
bnez i, L(gt1)
sd t2, (rp)
ret
L(gt1): ld t0, 8(ap)
addi ap, ap, 8
addi rp, rp, -8
addi i, i, -1
j L(b1)
L(b11): ld t0, 8(ap)
addi ap, ap, -8
addi rp, rp, -24
j L(b3)
L(top): addi ap, ap, 32
addi rp, rp, 32
addi i, i, -1
L(b2): sll t4, t0, tnc
srl t2, t0, cnt
ld t0, 0(ap)
or t4, t3, t4
sd t4, 0(rp)
L(b1): sll t4, t0, tnc
srl t3, t0, cnt
ld t0, 8(ap)
or t4, t2, t4
sd t4, 8(rp)
L(b0): sll t4, t0, tnc
srl t2, t0, cnt
ld t0, 16(ap)
or t4, t3, t4
sd t4, 16(rp)
L(b3): sll t4, t0, tnc
srl t3, t0, cnt
ld t0, 24(ap)
or t4, t2, t4
sd t4, 24(rp)
bnez i, L(top)
L(end): sll t4, t0, tnc
srl t2, t0, cnt
or t4, t3, t4
sd t4, 32(rp)
sd t2, 40(rp)
ret
EPILOGUE()
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