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f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
84 lines
2.1 KiB
NASM
84 lines
2.1 KiB
NASM
dnl ARM64 mpn_invert_limb -- Invert a normalized limb.
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dnl Contributed to the GNU project by Torbjörn Granlund.
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dnl Copyright 2013 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 cycles/limb
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C Cortex-A53 ?
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C Cortex-A57 ?
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C Compiler generated, mildly edited. Could surely be further optimised.
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ASM_START()
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PROLOGUE(mpn_invert_limb)
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lsr x2, x0, #54
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adrp x1, approx_tab
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and x2, x2, #0x1fe
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add x1, x1, :lo12:approx_tab
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ldrh w3, [x1,x2]
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lsr x4, x0, #24
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add x4, x4, #1
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ubfiz x2, x3, #11, #16
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umull x3, w3, w3
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mul x3, x3, x4
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sub x2, x2, #1
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sub x2, x2, x3, lsr #40
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lsl x3, x2, #60
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mul x1, x2, x2
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msub x1, x1, x4, x3
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lsl x2, x2, #13
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add x1, x2, x1, lsr #47
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and x2, x0, #1
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neg x3, x2
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and x3, x3, x1, lsr #1
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add x2, x2, x0, lsr #1
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msub x2, x1, x2, x3
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umulh x2, x2, x1
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lsl x1, x1, #31
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add x1, x1, x2, lsr #1
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mul x3, x1, x0
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umulh x2, x1, x0
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adds x4, x3, x0
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adc x0, x2, x0
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sub x0, x1, x0
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ret
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EPILOGUE()
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RODATA
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ALIGN(2)
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TYPE( approx_tab, object)
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SIZE( approx_tab, 512)
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approx_tab:
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forloop(i,256,512-1,dnl
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` .hword eval(0x7fd00/i)
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')dnl
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