Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpn/arm64/copyd.asm

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+dnl  ARM64 mpn_copyd.
+
+dnl  Copyright 2013, 2020 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 Cortex-A53	 1.8
+C Cortex-A55	 1.28
+C Cortex-A57
+C Cortex-A72	 1
+C Cortex-A73	 1.1-1.35 (alignment dependent)
+C X-Gene	 1
+C Apple M1	 0.31
+
+changecom(blah)
+
+define(`rp', `x0')
+define(`up', `x1')
+define(`n',  `x2')
+
+ASM_START()
+PROLOGUE(mpn_copyd)
+	add	rp, rp, n, lsl #3
+	add	up, up, n, lsl #3
+
+	cmp	n, #3
+	b.le	L(bc)
+
+C Copy until rp is 128-bit aligned
+	tbz	rp, #3, L(al2)
+	ldr	x4, [up,#-8]!
+	sub	n, n, #1
+	str	x4, [rp,#-8]!
+
+L(al2):	ldp	x4,x5, [up,#-16]!
+	sub	n, n, #6
+	tbnz	n, #63, L(end)
+
+	ALIGN(16)
+L(top):	ldp	x6,x7, [up,#-16]
+	stp	x4,x5, [rp,#-16]
+	ldp	x4,x5, [up,#-32]!
+	stp	x6,x7, [rp,#-32]!
+	sub	n, n, #4
+	tbz	n, #63, L(top)
+
+L(end):	stp	x4,x5, [rp,#-16]!
+
+C Copy last 0-3 limbs.  Note that rp is aligned after loop, but not when we
+C arrive here via L(bc)
+L(bc):	tbz	n, #1, L(tl1)
+	ldp	x4,x5, [up,#-16]!
+	stp	x4,x5, [rp,#-16]!
+L(tl1):	tbz	n, #0, L(tl2)
+	ldr	x4, [up,#-8]
+	str	x4, [rp,#-8]
+L(tl2):	ret
+EPILOGUE()