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76 lines
2.0 KiB
NASM
76 lines
2.0 KiB
NASM
dnl RISC-V/64 mpn_addmul_1 and mpn_submul_1.
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dnl Copyright 2016 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://www.gnu.org/licenses/.
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include(`../config.m4')
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C INPUT PARAMETERS
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define(`rp', `a0')
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define(`up', `a1')
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define(`n', `a2')
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define(`v0', `a3')
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ifdef(`OPERATION_addmul_1',`
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define(`ADDSUB', `add')
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define(`CMPCY', `sltu $1, $2, $3')
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define(`func', `mpn_addmul_1')
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')
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ifdef(`OPERATION_submul_1',`
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define(`ADDSUB', `sub')
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define(`CMPCY', `sltu $1, $3, $2')
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define(`func', `mpn_submul_1')
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')
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MULFUNC_PROLOGUE(mpn_addmul_1 mpn_submul_1)
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ASM_START()
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PROLOGUE(func)
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li a6, 0
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L(top): ld a7, 0(up)
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addi up, up, 8 C bookkeeping
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ld a4, 0(rp)
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addi rp, rp, 8 C bookkeeping
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mul a5, a7, v0
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addi n, n, -1 C bookkeeping
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mulhu a7, a7, v0
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ADDSUB a5, a4, a5
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ADDSUB a6, a5, a6 C cycle 0, 3, ...
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CMPCY( a4, a5, a4)
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add a4, a4, a7
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CMPCY( a5, a6, a5) C cycle 1, 4, ...
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sd a6, -8(rp)
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add a6, a4, a5 C cycle 2, 5, ...
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bne n, x0, L(top) C bookkeeping
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L(end): mv a0, a6
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ret
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EPILOGUE()
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ASM_END()
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