From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>
Date: Fri, 30 Apr 2021 00:33:56 +0200
Subject: initial/final commit

---
 openssl-1.1.0h/crypto/chacha/asm/chacha-armv8.pl | 1135 ++++++++++++++++++++++
 1 file changed, 1135 insertions(+)
 create mode 100755 openssl-1.1.0h/crypto/chacha/asm/chacha-armv8.pl

(limited to 'openssl-1.1.0h/crypto/chacha/asm/chacha-armv8.pl')

diff --git a/openssl-1.1.0h/crypto/chacha/asm/chacha-armv8.pl b/openssl-1.1.0h/crypto/chacha/asm/chacha-armv8.pl
new file mode 100755
index 0000000..f7e1074
--- /dev/null
+++ b/openssl-1.1.0h/crypto/chacha/asm/chacha-armv8.pl
@@ -0,0 +1,1135 @@
+#! /usr/bin/env perl
+# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+#
+# ====================================================================
+# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
+# project. The module is, however, dual licensed under OpenSSL and
+# CRYPTOGAMS licenses depending on where you obtain it. For further
+# details see http://www.openssl.org/~appro/cryptogams/.
+# ====================================================================
+#
+# June 2015
+# 
+# ChaCha20 for ARMv8.
+#
+# Performance in cycles per byte out of large buffer.
+#
+#			IALU/gcc-4.9    3xNEON+1xIALU	6xNEON+2xIALU
+#
+# Apple A7		5.50/+49%       3.33            1.70
+# Cortex-A53		8.40/+80%       4.72		4.72(*)
+# Cortex-A57		8.06/+43%       4.90            4.43(**)
+# Denver		4.50/+82%       2.63		2.67(*)
+# X-Gene		9.50/+46%       8.82		8.89(*)
+# Mongoose		8.00/+44%	3.64		3.25
+#
+# (*)	it's expected that doubling interleave factor doesn't help
+#	all processors, only those with higher NEON latency and
+#	higher instruction issue rate;
+# (**)	expected improvement was actually higher;
+
+$flavour=shift;
+$output=shift;
+
+$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
+( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
+( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
+die "can't locate arm-xlate.pl";
+
+open OUT,"| \"$^X\" $xlate $flavour $output";
+*STDOUT=*OUT;
+
+sub AUTOLOAD()		# thunk [simplified] x86-style perlasm
+{ my $opcode = $AUTOLOAD; $opcode =~ s/.*:://; $opcode =~ s/_/\./;
+  my $arg = pop;
+    $arg = "#$arg" if ($arg*1 eq $arg);
+    $code .= "\t$opcode\t".join(',',@_,$arg)."\n";
+}
+
+my ($out,$inp,$len,$key,$ctr) = map("x$_",(0..4));
+
+my @x=map("x$_",(5..17,19..21));
+my @d=map("x$_",(22..28,30));
+
+sub ROUND {
+my ($a0,$b0,$c0,$d0)=@_;
+my ($a1,$b1,$c1,$d1)=map(($_&~3)+(($_+1)&3),($a0,$b0,$c0,$d0));
+my ($a2,$b2,$c2,$d2)=map(($_&~3)+(($_+1)&3),($a1,$b1,$c1,$d1));
+my ($a3,$b3,$c3,$d3)=map(($_&~3)+(($_+1)&3),($a2,$b2,$c2,$d2));
+
+    (
+	"&add_32	(@x[$a0],@x[$a0],@x[$b0])",
+	 "&add_32	(@x[$a1],@x[$a1],@x[$b1])",
+	  "&add_32	(@x[$a2],@x[$a2],@x[$b2])",
+	   "&add_32	(@x[$a3],@x[$a3],@x[$b3])",
+	"&eor_32	(@x[$d0],@x[$d0],@x[$a0])",
+	 "&eor_32	(@x[$d1],@x[$d1],@x[$a1])",
+	  "&eor_32	(@x[$d2],@x[$d2],@x[$a2])",
+	   "&eor_32	(@x[$d3],@x[$d3],@x[$a3])",
+	"&ror_32	(@x[$d0],@x[$d0],16)",
+	 "&ror_32	(@x[$d1],@x[$d1],16)",
+	  "&ror_32	(@x[$d2],@x[$d2],16)",
+	   "&ror_32	(@x[$d3],@x[$d3],16)",
+
+	"&add_32	(@x[$c0],@x[$c0],@x[$d0])",
+	 "&add_32	(@x[$c1],@x[$c1],@x[$d1])",
+	  "&add_32	(@x[$c2],@x[$c2],@x[$d2])",
+	   "&add_32	(@x[$c3],@x[$c3],@x[$d3])",
+	"&eor_32	(@x[$b0],@x[$b0],@x[$c0])",
+	 "&eor_32	(@x[$b1],@x[$b1],@x[$c1])",
+	  "&eor_32	(@x[$b2],@x[$b2],@x[$c2])",
+	   "&eor_32	(@x[$b3],@x[$b3],@x[$c3])",
+	"&ror_32	(@x[$b0],@x[$b0],20)",
+	 "&ror_32	(@x[$b1],@x[$b1],20)",
+	  "&ror_32	(@x[$b2],@x[$b2],20)",
+	   "&ror_32	(@x[$b3],@x[$b3],20)",
+
+	"&add_32	(@x[$a0],@x[$a0],@x[$b0])",
+	 "&add_32	(@x[$a1],@x[$a1],@x[$b1])",
+	  "&add_32	(@x[$a2],@x[$a2],@x[$b2])",
+	   "&add_32	(@x[$a3],@x[$a3],@x[$b3])",
+	"&eor_32	(@x[$d0],@x[$d0],@x[$a0])",
+	 "&eor_32	(@x[$d1],@x[$d1],@x[$a1])",
+	  "&eor_32	(@x[$d2],@x[$d2],@x[$a2])",
+	   "&eor_32	(@x[$d3],@x[$d3],@x[$a3])",
+	"&ror_32	(@x[$d0],@x[$d0],24)",
+	 "&ror_32	(@x[$d1],@x[$d1],24)",
+	  "&ror_32	(@x[$d2],@x[$d2],24)",
+	   "&ror_32	(@x[$d3],@x[$d3],24)",
+
+	"&add_32	(@x[$c0],@x[$c0],@x[$d0])",
+	 "&add_32	(@x[$c1],@x[$c1],@x[$d1])",
+	  "&add_32	(@x[$c2],@x[$c2],@x[$d2])",
+	   "&add_32	(@x[$c3],@x[$c3],@x[$d3])",
+	"&eor_32	(@x[$b0],@x[$b0],@x[$c0])",
+	 "&eor_32	(@x[$b1],@x[$b1],@x[$c1])",
+	  "&eor_32	(@x[$b2],@x[$b2],@x[$c2])",
+	   "&eor_32	(@x[$b3],@x[$b3],@x[$c3])",
+	"&ror_32	(@x[$b0],@x[$b0],25)",
+	 "&ror_32	(@x[$b1],@x[$b1],25)",
+	  "&ror_32	(@x[$b2],@x[$b2],25)",
+	   "&ror_32	(@x[$b3],@x[$b3],25)"
+    );
+}
+
+$code.=<<___;
+#include "arm_arch.h"
+
+.text
+
+.extern	OPENSSL_armcap_P
+
+.align	5
+.Lsigma:
+.quad	0x3320646e61707865,0x6b20657479622d32		// endian-neutral
+.Lone:
+.long	1,0,0,0
+.LOPENSSL_armcap_P:
+#ifdef	__ILP32__
+.long	OPENSSL_armcap_P-.
+#else
+.quad	OPENSSL_armcap_P-.
+#endif
+.asciz	"ChaCha20 for ARMv8, CRYPTOGAMS by <appro\@openssl.org>"
+
+.globl	ChaCha20_ctr32
+.type	ChaCha20_ctr32,%function
+.align	5
+ChaCha20_ctr32:
+	cbz	$len,.Labort
+	adr	@x[0],.LOPENSSL_armcap_P
+	cmp	$len,#192
+	b.lo	.Lshort
+#ifdef	__ILP32__
+	ldrsw	@x[1],[@x[0]]
+#else
+	ldr	@x[1],[@x[0]]
+#endif
+	ldr	w17,[@x[1],@x[0]]
+	tst	w17,#ARMV7_NEON
+	b.ne	ChaCha20_neon
+
+.Lshort:
+	stp	x29,x30,[sp,#-96]!
+	add	x29,sp,#0
+
+	adr	@x[0],.Lsigma
+	stp	x19,x20,[sp,#16]
+	stp	x21,x22,[sp,#32]
+	stp	x23,x24,[sp,#48]
+	stp	x25,x26,[sp,#64]
+	stp	x27,x28,[sp,#80]
+	sub	sp,sp,#64
+
+	ldp	@d[0],@d[1],[@x[0]]		// load sigma
+	ldp	@d[2],@d[3],[$key]		// load key
+	ldp	@d[4],@d[5],[$key,#16]
+	ldp	@d[6],@d[7],[$ctr]		// load counter
+#ifdef	__ARMEB__
+	ror	@d[2],@d[2],#32
+	ror	@d[3],@d[3],#32
+	ror	@d[4],@d[4],#32
+	ror	@d[5],@d[5],#32
+	ror	@d[6],@d[6],#32
+	ror	@d[7],@d[7],#32
+#endif
+
+.Loop_outer:
+	mov.32	@x[0],@d[0]			// unpack key block
+	lsr	@x[1],@d[0],#32
+	mov.32	@x[2],@d[1]
+	lsr	@x[3],@d[1],#32
+	mov.32	@x[4],@d[2]
+	lsr	@x[5],@d[2],#32
+	mov.32	@x[6],@d[3]
+	lsr	@x[7],@d[3],#32
+	mov.32	@x[8],@d[4]
+	lsr	@x[9],@d[4],#32
+	mov.32	@x[10],@d[5]
+	lsr	@x[11],@d[5],#32
+	mov.32	@x[12],@d[6]
+	lsr	@x[13],@d[6],#32
+	mov.32	@x[14],@d[7]
+	lsr	@x[15],@d[7],#32
+
+	mov	$ctr,#10
+	subs	$len,$len,#64
+.Loop:
+	sub	$ctr,$ctr,#1	
+___
+	foreach (&ROUND(0, 4, 8,12)) { eval; }
+	foreach (&ROUND(0, 5,10,15)) { eval; }
+$code.=<<___;
+	cbnz	$ctr,.Loop
+
+	add.32	@x[0],@x[0],@d[0]		// accumulate key block
+	add	@x[1],@x[1],@d[0],lsr#32
+	add.32	@x[2],@x[2],@d[1]
+	add	@x[3],@x[3],@d[1],lsr#32
+	add.32	@x[4],@x[4],@d[2]
+	add	@x[5],@x[5],@d[2],lsr#32
+	add.32	@x[6],@x[6],@d[3]
+	add	@x[7],@x[7],@d[3],lsr#32
+	add.32	@x[8],@x[8],@d[4]
+	add	@x[9],@x[9],@d[4],lsr#32
+	add.32	@x[10],@x[10],@d[5]
+	add	@x[11],@x[11],@d[5],lsr#32
+	add.32	@x[12],@x[12],@d[6]
+	add	@x[13],@x[13],@d[6],lsr#32
+	add.32	@x[14],@x[14],@d[7]
+	add	@x[15],@x[15],@d[7],lsr#32
+
+	b.lo	.Ltail
+
+	add	@x[0],@x[0],@x[1],lsl#32	// pack
+	add	@x[2],@x[2],@x[3],lsl#32
+	ldp	@x[1],@x[3],[$inp,#0]		// load input
+	add	@x[4],@x[4],@x[5],lsl#32
+	add	@x[6],@x[6],@x[7],lsl#32
+	ldp	@x[5],@x[7],[$inp,#16]
+	add	@x[8],@x[8],@x[9],lsl#32
+	add	@x[10],@x[10],@x[11],lsl#32
+	ldp	@x[9],@x[11],[$inp,#32]
+	add	@x[12],@x[12],@x[13],lsl#32
+	add	@x[14],@x[14],@x[15],lsl#32
+	ldp	@x[13],@x[15],[$inp,#48]
+	add	$inp,$inp,#64
+#ifdef	__ARMEB__
+	rev	@x[0],@x[0]
+	rev	@x[2],@x[2]
+	rev	@x[4],@x[4]
+	rev	@x[6],@x[6]
+	rev	@x[8],@x[8]
+	rev	@x[10],@x[10]
+	rev	@x[12],@x[12]
+	rev	@x[14],@x[14]
+#endif
+	eor	@x[0],@x[0],@x[1]
+	eor	@x[2],@x[2],@x[3]
+	eor	@x[4],@x[4],@x[5]
+	eor	@x[6],@x[6],@x[7]
+	eor	@x[8],@x[8],@x[9]
+	eor	@x[10],@x[10],@x[11]
+	eor	@x[12],@x[12],@x[13]
+	eor	@x[14],@x[14],@x[15]
+
+	stp	@x[0],@x[2],[$out,#0]		// store output
+	 add	@d[6],@d[6],#1			// increment counter
+	stp	@x[4],@x[6],[$out,#16]
+	stp	@x[8],@x[10],[$out,#32]
+	stp	@x[12],@x[14],[$out,#48]
+	add	$out,$out,#64
+
+	b.hi	.Loop_outer
+
+	ldp	x19,x20,[x29,#16]
+	add	sp,sp,#64
+	ldp	x21,x22,[x29,#32]
+	ldp	x23,x24,[x29,#48]
+	ldp	x25,x26,[x29,#64]
+	ldp	x27,x28,[x29,#80]
+	ldp	x29,x30,[sp],#96
+.Labort:
+	ret
+
+.align	4
+.Ltail:
+	add	$len,$len,#64
+.Less_than_64:
+	sub	$out,$out,#1
+	add	$inp,$inp,$len
+	add	$out,$out,$len
+	add	$ctr,sp,$len
+	neg	$len,$len
+
+	add	@x[0],@x[0],@x[1],lsl#32	// pack
+	add	@x[2],@x[2],@x[3],lsl#32
+	add	@x[4],@x[4],@x[5],lsl#32
+	add	@x[6],@x[6],@x[7],lsl#32
+	add	@x[8],@x[8],@x[9],lsl#32
+	add	@x[10],@x[10],@x[11],lsl#32
+	add	@x[12],@x[12],@x[13],lsl#32
+	add	@x[14],@x[14],@x[15],lsl#32
+#ifdef	__ARMEB__
+	rev	@x[0],@x[0]
+	rev	@x[2],@x[2]
+	rev	@x[4],@x[4]
+	rev	@x[6],@x[6]
+	rev	@x[8],@x[8]
+	rev	@x[10],@x[10]
+	rev	@x[12],@x[12]
+	rev	@x[14],@x[14]
+#endif
+	stp	@x[0],@x[2],[sp,#0]
+	stp	@x[4],@x[6],[sp,#16]
+	stp	@x[8],@x[10],[sp,#32]
+	stp	@x[12],@x[14],[sp,#48]
+
+.Loop_tail:
+	ldrb	w10,[$inp,$len]
+	ldrb	w11,[$ctr,$len]
+	add	$len,$len,#1
+	eor	w10,w10,w11
+	strb	w10,[$out,$len]
+	cbnz	$len,.Loop_tail
+
+	stp	xzr,xzr,[sp,#0]
+	stp	xzr,xzr,[sp,#16]
+	stp	xzr,xzr,[sp,#32]
+	stp	xzr,xzr,[sp,#48]
+
+	ldp	x19,x20,[x29,#16]
+	add	sp,sp,#64
+	ldp	x21,x22,[x29,#32]
+	ldp	x23,x24,[x29,#48]
+	ldp	x25,x26,[x29,#64]
+	ldp	x27,x28,[x29,#80]
+	ldp	x29,x30,[sp],#96
+	ret
+.size	ChaCha20_ctr32,.-ChaCha20_ctr32
+___
+
+{{{
+my ($A0,$B0,$C0,$D0,$A1,$B1,$C1,$D1,$A2,$B2,$C2,$D2,$T0,$T1,$T2,$T3) =
+    map("v$_.4s",(0..7,16..23));
+my (@K)=map("v$_.4s",(24..30));
+my $ONE="v31.4s";
+
+sub NEONROUND {
+my $odd = pop;
+my ($a,$b,$c,$d,$t)=@_;
+
+	(
+	"&add		('$a','$a','$b')",
+	"&eor		('$d','$d','$a')",
+	"&rev32_16	('$d','$d')",		# vrot ($d,16)
+
+	"&add		('$c','$c','$d')",
+	"&eor		('$t','$b','$c')",
+	"&ushr		('$b','$t',20)",
+	"&sli		('$b','$t',12)",
+
+	"&add		('$a','$a','$b')",
+	"&eor		('$t','$d','$a')",
+	"&ushr		('$d','$t',24)",
+	"&sli		('$d','$t',8)",
+
+	"&add		('$c','$c','$d')",
+	"&eor		('$t','$b','$c')",
+	"&ushr		('$b','$t',25)",
+	"&sli		('$b','$t',7)",
+
+	"&ext		('$c','$c','$c',8)",
+	"&ext		('$d','$d','$d',$odd?4:12)",
+	"&ext		('$b','$b','$b',$odd?12:4)"
+	);
+}
+
+$code.=<<___;
+
+.type	ChaCha20_neon,%function
+.align	5
+ChaCha20_neon:
+	stp	x29,x30,[sp,#-96]!
+	add	x29,sp,#0
+
+	adr	@x[0],.Lsigma
+	stp	x19,x20,[sp,#16]
+	stp	x21,x22,[sp,#32]
+	stp	x23,x24,[sp,#48]
+	stp	x25,x26,[sp,#64]
+	stp	x27,x28,[sp,#80]
+	cmp	$len,#512
+	b.hs	.L512_or_more_neon
+
+	sub	sp,sp,#64
+
+	ldp	@d[0],@d[1],[@x[0]]		// load sigma
+	ld1	{@K[0]},[@x[0]],#16
+	ldp	@d[2],@d[3],[$key]		// load key
+	ldp	@d[4],@d[5],[$key,#16]
+	ld1	{@K[1],@K[2]},[$key]
+	ldp	@d[6],@d[7],[$ctr]		// load counter
+	ld1	{@K[3]},[$ctr]
+	ld1	{$ONE},[@x[0]]
+#ifdef	__ARMEB__
+	rev64	@K[0],@K[0]
+	ror	@d[2],@d[2],#32
+	ror	@d[3],@d[3],#32
+	ror	@d[4],@d[4],#32
+	ror	@d[5],@d[5],#32
+	ror	@d[6],@d[6],#32
+	ror	@d[7],@d[7],#32
+#endif
+	add	@K[3],@K[3],$ONE		// += 1
+	add	@K[4],@K[3],$ONE
+	add	@K[5],@K[4],$ONE
+	shl	$ONE,$ONE,#2			// 1 -> 4
+
+.Loop_outer_neon:
+	mov.32	@x[0],@d[0]			// unpack key block
+	lsr	@x[1],@d[0],#32
+	 mov	$A0,@K[0]
+	mov.32	@x[2],@d[1]
+	lsr	@x[3],@d[1],#32
+	 mov	$A1,@K[0]
+	mov.32	@x[4],@d[2]
+	lsr	@x[5],@d[2],#32
+	 mov	$A2,@K[0]
+	mov.32	@x[6],@d[3]
+	 mov	$B0,@K[1]
+	lsr	@x[7],@d[3],#32
+	 mov	$B1,@K[1]
+	mov.32	@x[8],@d[4]
+	 mov	$B2,@K[1]
+	lsr	@x[9],@d[4],#32
+	 mov	$D0,@K[3]
+	mov.32	@x[10],@d[5]
+	 mov	$D1,@K[4]
+	lsr	@x[11],@d[5],#32
+	 mov	$D2,@K[5]
+	mov.32	@x[12],@d[6]
+	 mov	$C0,@K[2]
+	lsr	@x[13],@d[6],#32
+	 mov	$C1,@K[2]
+	mov.32	@x[14],@d[7]
+	 mov	$C2,@K[2]
+	lsr	@x[15],@d[7],#32
+
+	mov	$ctr,#10
+	subs	$len,$len,#256
+.Loop_neon:
+	sub	$ctr,$ctr,#1
+___
+	my @thread0=&NEONROUND($A0,$B0,$C0,$D0,$T0,0);
+	my @thread1=&NEONROUND($A1,$B1,$C1,$D1,$T1,0);
+	my @thread2=&NEONROUND($A2,$B2,$C2,$D2,$T2,0);
+	my @thread3=&ROUND(0,4,8,12);
+
+	foreach (@thread0) {
+		eval;			eval(shift(@thread3));
+		eval(shift(@thread1));	eval(shift(@thread3));
+		eval(shift(@thread2));	eval(shift(@thread3));
+	}
+
+	@thread0=&NEONROUND($A0,$B0,$C0,$D0,$T0,1);
+	@thread1=&NEONROUND($A1,$B1,$C1,$D1,$T1,1);
+	@thread2=&NEONROUND($A2,$B2,$C2,$D2,$T2,1);
+	@thread3=&ROUND(0,5,10,15);
+
+	foreach (@thread0) {
+		eval;			eval(shift(@thread3));
+		eval(shift(@thread1));	eval(shift(@thread3));
+		eval(shift(@thread2));	eval(shift(@thread3));
+	}
+$code.=<<___;
+	cbnz	$ctr,.Loop_neon
+
+	add.32	@x[0],@x[0],@d[0]		// accumulate key block
+	 add	$A0,$A0,@K[0]
+	add	@x[1],@x[1],@d[0],lsr#32
+	 add	$A1,$A1,@K[0]
+	add.32	@x[2],@x[2],@d[1]
+	 add	$A2,$A2,@K[0]
+	add	@x[3],@x[3],@d[1],lsr#32
+	 add	$C0,$C0,@K[2]
+	add.32	@x[4],@x[4],@d[2]
+	 add	$C1,$C1,@K[2]
+	add	@x[5],@x[5],@d[2],lsr#32
+	 add	$C2,$C2,@K[2]
+	add.32	@x[6],@x[6],@d[3]
+	 add	$D0,$D0,@K[3]
+	add	@x[7],@x[7],@d[3],lsr#32
+	add.32	@x[8],@x[8],@d[4]
+	 add	$D1,$D1,@K[4]
+	add	@x[9],@x[9],@d[4],lsr#32
+	add.32	@x[10],@x[10],@d[5]
+	 add	$D2,$D2,@K[5]
+	add	@x[11],@x[11],@d[5],lsr#32
+	add.32	@x[12],@x[12],@d[6]
+	 add	$B0,$B0,@K[1]
+	add	@x[13],@x[13],@d[6],lsr#32
+	add.32	@x[14],@x[14],@d[7]
+	 add	$B1,$B1,@K[1]
+	add	@x[15],@x[15],@d[7],lsr#32
+	 add	$B2,$B2,@K[1]
+
+	b.lo	.Ltail_neon
+
+	add	@x[0],@x[0],@x[1],lsl#32	// pack
+	add	@x[2],@x[2],@x[3],lsl#32
+	ldp	@x[1],@x[3],[$inp,#0]		// load input
+	add	@x[4],@x[4],@x[5],lsl#32
+	add	@x[6],@x[6],@x[7],lsl#32
+	ldp	@x[5],@x[7],[$inp,#16]
+	add	@x[8],@x[8],@x[9],lsl#32
+	add	@x[10],@x[10],@x[11],lsl#32
+	ldp	@x[9],@x[11],[$inp,#32]
+	add	@x[12],@x[12],@x[13],lsl#32
+	add	@x[14],@x[14],@x[15],lsl#32
+	ldp	@x[13],@x[15],[$inp,#48]
+	add	$inp,$inp,#64
+#ifdef	__ARMEB__
+	rev	@x[0],@x[0]
+	rev	@x[2],@x[2]
+	rev	@x[4],@x[4]
+	rev	@x[6],@x[6]
+	rev	@x[8],@x[8]
+	rev	@x[10],@x[10]
+	rev	@x[12],@x[12]
+	rev	@x[14],@x[14]
+#endif
+	ld1.8	{$T0-$T3},[$inp],#64
+	eor	@x[0],@x[0],@x[1]
+	eor	@x[2],@x[2],@x[3]
+	eor	@x[4],@x[4],@x[5]
+	eor	@x[6],@x[6],@x[7]
+	eor	@x[8],@x[8],@x[9]
+	 eor	$A0,$A0,$T0
+	eor	@x[10],@x[10],@x[11]
+	 eor	$B0,$B0,$T1
+	eor	@x[12],@x[12],@x[13]
+	 eor	$C0,$C0,$T2
+	eor	@x[14],@x[14],@x[15]
+	 eor	$D0,$D0,$T3
+	 ld1.8	{$T0-$T3},[$inp],#64
+
+	stp	@x[0],@x[2],[$out,#0]		// store output
+	 add	@d[6],@d[6],#4			// increment counter
+	stp	@x[4],@x[6],[$out,#16]
+	 add	@K[3],@K[3],$ONE		// += 4
+	stp	@x[8],@x[10],[$out,#32]
+	 add	@K[4],@K[4],$ONE
+	stp	@x[12],@x[14],[$out,#48]
+	 add	@K[5],@K[5],$ONE
+	add	$out,$out,#64
+
+	st1.8	{$A0-$D0},[$out],#64
+	ld1.8	{$A0-$D0},[$inp],#64
+
+	eor	$A1,$A1,$T0
+	eor	$B1,$B1,$T1
+	eor	$C1,$C1,$T2
+	eor	$D1,$D1,$T3
+	st1.8	{$A1-$D1},[$out],#64
+
+	eor	$A2,$A2,$A0
+	eor	$B2,$B2,$B0
+	eor	$C2,$C2,$C0
+	eor	$D2,$D2,$D0
+	st1.8	{$A2-$D2},[$out],#64
+
+	b.hi	.Loop_outer_neon
+
+	ldp	x19,x20,[x29,#16]
+	add	sp,sp,#64
+	ldp	x21,x22,[x29,#32]
+	ldp	x23,x24,[x29,#48]
+	ldp	x25,x26,[x29,#64]
+	ldp	x27,x28,[x29,#80]
+	ldp	x29,x30,[sp],#96
+	ret
+
+.Ltail_neon:
+	add	$len,$len,#256
+	cmp	$len,#64
+	b.lo	.Less_than_64
+
+	add	@x[0],@x[0],@x[1],lsl#32	// pack
+	add	@x[2],@x[2],@x[3],lsl#32
+	ldp	@x[1],@x[3],[$inp,#0]		// load input
+	add	@x[4],@x[4],@x[5],lsl#32
+	add	@x[6],@x[6],@x[7],lsl#32
+	ldp	@x[5],@x[7],[$inp,#16]
+	add	@x[8],@x[8],@x[9],lsl#32
+	add	@x[10],@x[10],@x[11],lsl#32
+	ldp	@x[9],@x[11],[$inp,#32]
+	add	@x[12],@x[12],@x[13],lsl#32
+	add	@x[14],@x[14],@x[15],lsl#32
+	ldp	@x[13],@x[15],[$inp,#48]
+	add	$inp,$inp,#64
+#ifdef	__ARMEB__
+	rev	@x[0],@x[0]
+	rev	@x[2],@x[2]
+	rev	@x[4],@x[4]
+	rev	@x[6],@x[6]
+	rev	@x[8],@x[8]
+	rev	@x[10],@x[10]
+	rev	@x[12],@x[12]
+	rev	@x[14],@x[14]
+#endif
+	eor	@x[0],@x[0],@x[1]
+	eor	@x[2],@x[2],@x[3]
+	eor	@x[4],@x[4],@x[5]
+	eor	@x[6],@x[6],@x[7]
+	eor	@x[8],@x[8],@x[9]
+	eor	@x[10],@x[10],@x[11]
+	eor	@x[12],@x[12],@x[13]
+	eor	@x[14],@x[14],@x[15]
+
+	stp	@x[0],@x[2],[$out,#0]		// store output
+	 add	@d[6],@d[6],#4			// increment counter
+	stp	@x[4],@x[6],[$out,#16]
+	stp	@x[8],@x[10],[$out,#32]
+	stp	@x[12],@x[14],[$out,#48]
+	add	$out,$out,#64
+	b.eq	.Ldone_neon
+	sub	$len,$len,#64
+	cmp	$len,#64
+	b.lo	.Less_than_128
+
+	ld1.8	{$T0-$T3},[$inp],#64
+	eor	$A0,$A0,$T0
+	eor	$B0,$B0,$T1
+	eor	$C0,$C0,$T2
+	eor	$D0,$D0,$T3
+	st1.8	{$A0-$D0},[$out],#64
+	b.eq	.Ldone_neon
+	sub	$len,$len,#64
+	cmp	$len,#64
+	b.lo	.Less_than_192
+
+	ld1.8	{$T0-$T3},[$inp],#64
+	eor	$A1,$A1,$T0
+	eor	$B1,$B1,$T1
+	eor	$C1,$C1,$T2
+	eor	$D1,$D1,$T3
+	st1.8	{$A1-$D1},[$out],#64
+	b.eq	.Ldone_neon
+	sub	$len,$len,#64
+
+	st1.8	{$A2-$D2},[sp]
+	b	.Last_neon
+
+.Less_than_128:
+	st1.8	{$A0-$D0},[sp]
+	b	.Last_neon
+.Less_than_192:
+	st1.8	{$A1-$D1},[sp]
+	b	.Last_neon
+
+.align	4
+.Last_neon:
+	sub	$out,$out,#1
+	add	$inp,$inp,$len
+	add	$out,$out,$len
+	add	$ctr,sp,$len
+	neg	$len,$len
+
+.Loop_tail_neon:
+	ldrb	w10,[$inp,$len]
+	ldrb	w11,[$ctr,$len]
+	add	$len,$len,#1
+	eor	w10,w10,w11
+	strb	w10,[$out,$len]
+	cbnz	$len,.Loop_tail_neon
+
+	stp	xzr,xzr,[sp,#0]
+	stp	xzr,xzr,[sp,#16]
+	stp	xzr,xzr,[sp,#32]
+	stp	xzr,xzr,[sp,#48]
+
+.Ldone_neon:
+	ldp	x19,x20,[x29,#16]
+	add	sp,sp,#64
+	ldp	x21,x22,[x29,#32]
+	ldp	x23,x24,[x29,#48]
+	ldp	x25,x26,[x29,#64]
+	ldp	x27,x28,[x29,#80]
+	ldp	x29,x30,[sp],#96
+	ret
+.size	ChaCha20_neon,.-ChaCha20_neon
+___
+{
+my ($T0,$T1,$T2,$T3,$T4,$T5)=@K;
+my ($A0,$B0,$C0,$D0,$A1,$B1,$C1,$D1,$A2,$B2,$C2,$D2,
+    $A3,$B3,$C3,$D3,$A4,$B4,$C4,$D4,$A5,$B5,$C5,$D5) = map("v$_.4s",(0..23));
+
+$code.=<<___;
+.type	ChaCha20_512_neon,%function
+.align	5
+ChaCha20_512_neon:
+	stp	x29,x30,[sp,#-96]!
+	add	x29,sp,#0
+
+	adr	@x[0],.Lsigma
+	stp	x19,x20,[sp,#16]
+	stp	x21,x22,[sp,#32]
+	stp	x23,x24,[sp,#48]
+	stp	x25,x26,[sp,#64]
+	stp	x27,x28,[sp,#80]
+
+.L512_or_more_neon:
+	sub	sp,sp,#128+64
+
+	ldp	@d[0],@d[1],[@x[0]]		// load sigma
+	ld1	{@K[0]},[@x[0]],#16
+	ldp	@d[2],@d[3],[$key]		// load key
+	ldp	@d[4],@d[5],[$key,#16]
+	ld1	{@K[1],@K[2]},[$key]
+	ldp	@d[6],@d[7],[$ctr]		// load counter
+	ld1	{@K[3]},[$ctr]
+	ld1	{$ONE},[@x[0]]
+#ifdef	__ARMEB__
+	rev64	@K[0],@K[0]
+	ror	@d[2],@d[2],#32
+	ror	@d[3],@d[3],#32
+	ror	@d[4],@d[4],#32
+	ror	@d[5],@d[5],#32
+	ror	@d[6],@d[6],#32
+	ror	@d[7],@d[7],#32
+#endif
+	add	@K[3],@K[3],$ONE		// += 1
+	stp	@K[0],@K[1],[sp,#0]		// off-load key block, invariant part
+	add	@K[3],@K[3],$ONE		// not typo
+	str	@K[2],[sp,#32]
+	add	@K[4],@K[3],$ONE
+	add	@K[5],@K[4],$ONE
+	add	@K[6],@K[5],$ONE
+	shl	$ONE,$ONE,#2			// 1 -> 4
+
+	stp	d8,d9,[sp,#128+0]		// meet ABI requirements
+	stp	d10,d11,[sp,#128+16]
+	stp	d12,d13,[sp,#128+32]
+	stp	d14,d15,[sp,#128+48]
+
+	sub	$len,$len,#512			// not typo
+
+.Loop_outer_512_neon:
+	 mov	$A0,@K[0]
+	 mov	$A1,@K[0]
+	 mov	$A2,@K[0]
+	 mov	$A3,@K[0]
+	 mov	$A4,@K[0]
+	 mov	$A5,@K[0]
+	 mov	$B0,@K[1]
+	mov.32	@x[0],@d[0]			// unpack key block
+	 mov	$B1,@K[1]
+	lsr	@x[1],@d[0],#32
+	 mov	$B2,@K[1]
+	mov.32	@x[2],@d[1]
+	 mov	$B3,@K[1]
+	lsr	@x[3],@d[1],#32
+	 mov	$B4,@K[1]
+	mov.32	@x[4],@d[2]
+	 mov	$B5,@K[1]
+	lsr	@x[5],@d[2],#32
+	 mov	$D0,@K[3]
+	mov.32	@x[6],@d[3]
+	 mov	$D1,@K[4]
+	lsr	@x[7],@d[3],#32
+	 mov	$D2,@K[5]
+	mov.32	@x[8],@d[4]
+	 mov	$D3,@K[6]
+	lsr	@x[9],@d[4],#32
+	 mov	$C0,@K[2]
+	mov.32	@x[10],@d[5]
+	 mov	$C1,@K[2]
+	lsr	@x[11],@d[5],#32
+	 add	$D4,$D0,$ONE			// +4
+	mov.32	@x[12],@d[6]
+	 add	$D5,$D1,$ONE			// +4
+	lsr	@x[13],@d[6],#32
+	 mov	$C2,@K[2]
+	mov.32	@x[14],@d[7]
+	 mov	$C3,@K[2]
+	lsr	@x[15],@d[7],#32
+	 mov	$C4,@K[2]
+	 stp	@K[3],@K[4],[sp,#48]		// off-load key block, variable part
+	 mov	$C5,@K[2]
+	 str	@K[5],[sp,#80]
+
+	mov	$ctr,#5
+	subs	$len,$len,#512
+.Loop_upper_neon:
+	sub	$ctr,$ctr,#1
+___
+	my @thread0=&NEONROUND($A0,$B0,$C0,$D0,$T0,0);
+	my @thread1=&NEONROUND($A1,$B1,$C1,$D1,$T1,0);
+	my @thread2=&NEONROUND($A2,$B2,$C2,$D2,$T2,0);
+	my @thread3=&NEONROUND($A3,$B3,$C3,$D3,$T3,0);
+	my @thread4=&NEONROUND($A4,$B4,$C4,$D4,$T4,0);
+	my @thread5=&NEONROUND($A5,$B5,$C5,$D5,$T5,0);
+	my @thread67=(&ROUND(0,4,8,12),&ROUND(0,5,10,15));
+	my $diff = ($#thread0+1)*6 - $#thread67 - 1;
+	my $i = 0;
+
+	foreach (@thread0) {
+		eval;			eval(shift(@thread67));
+		eval(shift(@thread1));	eval(shift(@thread67));
+		eval(shift(@thread2));	eval(shift(@thread67));
+		eval(shift(@thread3));	eval(shift(@thread67));
+		eval(shift(@thread4));	eval(shift(@thread67));
+		eval(shift(@thread5));	eval(shift(@thread67));
+	}
+
+	@thread0=&NEONROUND($A0,$B0,$C0,$D0,$T0,1);
+	@thread1=&NEONROUND($A1,$B1,$C1,$D1,$T1,1);
+	@thread2=&NEONROUND($A2,$B2,$C2,$D2,$T2,1);
+	@thread3=&NEONROUND($A3,$B3,$C3,$D3,$T3,1);
+	@thread4=&NEONROUND($A4,$B4,$C4,$D4,$T4,1);
+	@thread5=&NEONROUND($A5,$B5,$C5,$D5,$T5,1);
+	@thread67=(&ROUND(0,4,8,12),&ROUND(0,5,10,15));
+
+	foreach (@thread0) {
+		eval;			eval(shift(@thread67));
+		eval(shift(@thread1));	eval(shift(@thread67));
+		eval(shift(@thread2));	eval(shift(@thread67));
+		eval(shift(@thread3));	eval(shift(@thread67));
+		eval(shift(@thread4));	eval(shift(@thread67));
+		eval(shift(@thread5));	eval(shift(@thread67));
+	}
+$code.=<<___;
+	cbnz	$ctr,.Loop_upper_neon
+
+	add.32	@x[0],@x[0],@d[0]		// accumulate key block
+	add	@x[1],@x[1],@d[0],lsr#32
+	add.32	@x[2],@x[2],@d[1]
+	add	@x[3],@x[3],@d[1],lsr#32
+	add.32	@x[4],@x[4],@d[2]
+	add	@x[5],@x[5],@d[2],lsr#32
+	add.32	@x[6],@x[6],@d[3]
+	add	@x[7],@x[7],@d[3],lsr#32
+	add.32	@x[8],@x[8],@d[4]
+	add	@x[9],@x[9],@d[4],lsr#32
+	add.32	@x[10],@x[10],@d[5]
+	add	@x[11],@x[11],@d[5],lsr#32
+	add.32	@x[12],@x[12],@d[6]
+	add	@x[13],@x[13],@d[6],lsr#32
+	add.32	@x[14],@x[14],@d[7]
+	add	@x[15],@x[15],@d[7],lsr#32
+
+	add	@x[0],@x[0],@x[1],lsl#32	// pack
+	add	@x[2],@x[2],@x[3],lsl#32
+	ldp	@x[1],@x[3],[$inp,#0]		// load input
+	add	@x[4],@x[4],@x[5],lsl#32
+	add	@x[6],@x[6],@x[7],lsl#32
+	ldp	@x[5],@x[7],[$inp,#16]
+	add	@x[8],@x[8],@x[9],lsl#32
+	add	@x[10],@x[10],@x[11],lsl#32
+	ldp	@x[9],@x[11],[$inp,#32]
+	add	@x[12],@x[12],@x[13],lsl#32
+	add	@x[14],@x[14],@x[15],lsl#32
+	ldp	@x[13],@x[15],[$inp,#48]
+	add	$inp,$inp,#64
+#ifdef	__ARMEB__
+	rev	@x[0],@x[0]
+	rev	@x[2],@x[2]
+	rev	@x[4],@x[4]
+	rev	@x[6],@x[6]
+	rev	@x[8],@x[8]
+	rev	@x[10],@x[10]
+	rev	@x[12],@x[12]
+	rev	@x[14],@x[14]
+#endif
+	eor	@x[0],@x[0],@x[1]
+	eor	@x[2],@x[2],@x[3]
+	eor	@x[4],@x[4],@x[5]
+	eor	@x[6],@x[6],@x[7]
+	eor	@x[8],@x[8],@x[9]
+	eor	@x[10],@x[10],@x[11]
+	eor	@x[12],@x[12],@x[13]
+	eor	@x[14],@x[14],@x[15]
+
+	 stp	@x[0],@x[2],[$out,#0]		// store output
+	 add	@d[6],@d[6],#1			// increment counter
+	mov.32	@x[0],@d[0]			// unpack key block
+	lsr	@x[1],@d[0],#32
+	 stp	@x[4],@x[6],[$out,#16]
+	mov.32	@x[2],@d[1]
+	lsr	@x[3],@d[1],#32
+	 stp	@x[8],@x[10],[$out,#32]
+	mov.32	@x[4],@d[2]
+	lsr	@x[5],@d[2],#32
+	 stp	@x[12],@x[14],[$out,#48]
+	 add	$out,$out,#64
+	mov.32	@x[6],@d[3]
+	lsr	@x[7],@d[3],#32
+	mov.32	@x[8],@d[4]
+	lsr	@x[9],@d[4],#32
+	mov.32	@x[10],@d[5]
+	lsr	@x[11],@d[5],#32
+	mov.32	@x[12],@d[6]
+	lsr	@x[13],@d[6],#32
+	mov.32	@x[14],@d[7]
+	lsr	@x[15],@d[7],#32
+
+	mov	$ctr,#5
+.Loop_lower_neon:
+	sub	$ctr,$ctr,#1
+___
+	@thread0=&NEONROUND($A0,$B0,$C0,$D0,$T0,0);
+	@thread1=&NEONROUND($A1,$B1,$C1,$D1,$T1,0);
+	@thread2=&NEONROUND($A2,$B2,$C2,$D2,$T2,0);
+	@thread3=&NEONROUND($A3,$B3,$C3,$D3,$T3,0);
+	@thread4=&NEONROUND($A4,$B4,$C4,$D4,$T4,0);
+	@thread5=&NEONROUND($A5,$B5,$C5,$D5,$T5,0);
+	@thread67=(&ROUND(0,4,8,12),&ROUND(0,5,10,15));
+
+	foreach (@thread0) {
+		eval;			eval(shift(@thread67));
+		eval(shift(@thread1));	eval(shift(@thread67));
+		eval(shift(@thread2));	eval(shift(@thread67));
+		eval(shift(@thread3));	eval(shift(@thread67));
+		eval(shift(@thread4));	eval(shift(@thread67));
+		eval(shift(@thread5));	eval(shift(@thread67));
+	}
+
+	@thread0=&NEONROUND($A0,$B0,$C0,$D0,$T0,1);
+	@thread1=&NEONROUND($A1,$B1,$C1,$D1,$T1,1);
+	@thread2=&NEONROUND($A2,$B2,$C2,$D2,$T2,1);
+	@thread3=&NEONROUND($A3,$B3,$C3,$D3,$T3,1);
+	@thread4=&NEONROUND($A4,$B4,$C4,$D4,$T4,1);
+	@thread5=&NEONROUND($A5,$B5,$C5,$D5,$T5,1);
+	@thread67=(&ROUND(0,4,8,12),&ROUND(0,5,10,15));
+
+	foreach (@thread0) {
+		eval;			eval(shift(@thread67));
+		eval(shift(@thread1));	eval(shift(@thread67));
+		eval(shift(@thread2));	eval(shift(@thread67));
+		eval(shift(@thread3));	eval(shift(@thread67));
+		eval(shift(@thread4));	eval(shift(@thread67));
+		eval(shift(@thread5));	eval(shift(@thread67));
+	}
+$code.=<<___;
+	cbnz	$ctr,.Loop_lower_neon
+
+	add.32	@x[0],@x[0],@d[0]		// accumulate key block
+	 ldp	@K[0],@K[1],[sp,#0]
+	add	@x[1],@x[1],@d[0],lsr#32
+	 ldp	@K[2],@K[3],[sp,#32]
+	add.32	@x[2],@x[2],@d[1]
+	 ldp	@K[4],@K[5],[sp,#64]
+	add	@x[3],@x[3],@d[1],lsr#32
+	 add	$A0,$A0,@K[0]
+	add.32	@x[4],@x[4],@d[2]
+	 add	$A1,$A1,@K[0]
+	add	@x[5],@x[5],@d[2],lsr#32
+	 add	$A2,$A2,@K[0]
+	add.32	@x[6],@x[6],@d[3]
+	 add	$A3,$A3,@K[0]
+	add	@x[7],@x[7],@d[3],lsr#32
+	 add	$A4,$A4,@K[0]
+	add.32	@x[8],@x[8],@d[4]
+	 add	$A5,$A5,@K[0]
+	add	@x[9],@x[9],@d[4],lsr#32
+	 add	$C0,$C0,@K[2]
+	add.32	@x[10],@x[10],@d[5]
+	 add	$C1,$C1,@K[2]
+	add	@x[11],@x[11],@d[5],lsr#32
+	 add	$C2,$C2,@K[2]
+	add.32	@x[12],@x[12],@d[6]
+	 add	$C3,$C3,@K[2]
+	add	@x[13],@x[13],@d[6],lsr#32
+	 add	$C4,$C4,@K[2]
+	add.32	@x[14],@x[14],@d[7]
+	 add	$C5,$C5,@K[2]
+	add	@x[15],@x[15],@d[7],lsr#32
+	 add	$D4,$D4,$ONE			// +4
+	add	@x[0],@x[0],@x[1],lsl#32	// pack
+	 add	$D5,$D5,$ONE			// +4
+	add	@x[2],@x[2],@x[3],lsl#32
+	 add	$D0,$D0,@K[3]
+	ldp	@x[1],@x[3],[$inp,#0]		// load input
+	 add	$D1,$D1,@K[4]
+	add	@x[4],@x[4],@x[5],lsl#32
+	 add	$D2,$D2,@K[5]
+	add	@x[6],@x[6],@x[7],lsl#32
+	 add	$D3,$D3,@K[6]
+	ldp	@x[5],@x[7],[$inp,#16]
+	 add	$D4,$D4,@K[3]
+	add	@x[8],@x[8],@x[9],lsl#32
+	 add	$D5,$D5,@K[4]
+	add	@x[10],@x[10],@x[11],lsl#32
+	 add	$B0,$B0,@K[1]
+	ldp	@x[9],@x[11],[$inp,#32]
+	 add	$B1,$B1,@K[1]
+	add	@x[12],@x[12],@x[13],lsl#32
+	 add	$B2,$B2,@K[1]
+	add	@x[14],@x[14],@x[15],lsl#32
+	 add	$B3,$B3,@K[1]
+	ldp	@x[13],@x[15],[$inp,#48]
+	 add	$B4,$B4,@K[1]
+	add	$inp,$inp,#64
+	 add	$B5,$B5,@K[1]
+
+#ifdef	__ARMEB__
+	rev	@x[0],@x[0]
+	rev	@x[2],@x[2]
+	rev	@x[4],@x[4]
+	rev	@x[6],@x[6]
+	rev	@x[8],@x[8]
+	rev	@x[10],@x[10]
+	rev	@x[12],@x[12]
+	rev	@x[14],@x[14]
+#endif
+	ld1.8	{$T0-$T3},[$inp],#64
+	eor	@x[0],@x[0],@x[1]
+	eor	@x[2],@x[2],@x[3]
+	eor	@x[4],@x[4],@x[5]
+	eor	@x[6],@x[6],@x[7]
+	eor	@x[8],@x[8],@x[9]
+	 eor	$A0,$A0,$T0
+	eor	@x[10],@x[10],@x[11]
+	 eor	$B0,$B0,$T1
+	eor	@x[12],@x[12],@x[13]
+	 eor	$C0,$C0,$T2
+	eor	@x[14],@x[14],@x[15]
+	 eor	$D0,$D0,$T3
+	 ld1.8	{$T0-$T3},[$inp],#64
+
+	stp	@x[0],@x[2],[$out,#0]		// store output
+	 add	@d[6],@d[6],#7			// increment counter
+	stp	@x[4],@x[6],[$out,#16]
+	stp	@x[8],@x[10],[$out,#32]
+	stp	@x[12],@x[14],[$out,#48]
+	add	$out,$out,#64
+	st1.8	{$A0-$D0},[$out],#64
+
+	ld1.8	{$A0-$D0},[$inp],#64
+	eor	$A1,$A1,$T0
+	eor	$B1,$B1,$T1
+	eor	$C1,$C1,$T2
+	eor	$D1,$D1,$T3
+	st1.8	{$A1-$D1},[$out],#64
+
+	ld1.8	{$A1-$D1},[$inp],#64
+	eor	$A2,$A2,$A0
+	 ldp	@K[0],@K[1],[sp,#0]
+	eor	$B2,$B2,$B0
+	 ldp	@K[2],@K[3],[sp,#32]
+	eor	$C2,$C2,$C0
+	eor	$D2,$D2,$D0
+	st1.8	{$A2-$D2},[$out],#64
+
+	ld1.8	{$A2-$D2},[$inp],#64
+	eor	$A3,$A3,$A1
+	eor	$B3,$B3,$B1
+	eor	$C3,$C3,$C1
+	eor	$D3,$D3,$D1
+	st1.8	{$A3-$D3},[$out],#64
+
+	ld1.8	{$A3-$D3},[$inp],#64
+	eor	$A4,$A4,$A2
+	eor	$B4,$B4,$B2
+	eor	$C4,$C4,$C2
+	eor	$D4,$D4,$D2
+	st1.8	{$A4-$D4},[$out],#64
+
+	shl	$A0,$ONE,#1			// 4 -> 8
+	eor	$A5,$A5,$A3
+	eor	$B5,$B5,$B3
+	eor	$C5,$C5,$C3
+	eor	$D5,$D5,$D3
+	st1.8	{$A5-$D5},[$out],#64
+
+	add	@K[3],@K[3],$A0			// += 8
+	add	@K[4],@K[4],$A0
+	add	@K[5],@K[5],$A0
+	add	@K[6],@K[6],$A0
+
+	b.hs	.Loop_outer_512_neon
+
+	adds	$len,$len,#512
+	ushr	$A0,$ONE,#2			// 4 -> 1
+
+	ldp	d8,d9,[sp,#128+0]		// meet ABI requirements
+	ldp	d10,d11,[sp,#128+16]
+	ldp	d12,d13,[sp,#128+32]
+	ldp	d14,d15,[sp,#128+48]
+
+	stp	@K[0],$ONE,[sp,#0]		// wipe off-load area
+	stp	@K[0],$ONE,[sp,#32]
+	stp	@K[0],$ONE,[sp,#64]
+
+	b.eq	.Ldone_512_neon
+
+	cmp	$len,#192
+	sub	@K[3],@K[3],$A0			// -= 1
+	sub	@K[4],@K[4],$A0
+	sub	@K[5],@K[5],$A0
+	add	sp,sp,#128
+	b.hs	.Loop_outer_neon
+
+	eor	@K[1],@K[1],@K[1]
+	eor	@K[2],@K[2],@K[2]
+	eor	@K[3],@K[3],@K[3]
+	eor	@K[4],@K[4],@K[4]
+	eor	@K[5],@K[5],@K[5]
+	eor	@K[6],@K[6],@K[6]
+	b	.Loop_outer
+
+.Ldone_512_neon:
+	ldp	x19,x20,[x29,#16]
+	add	sp,sp,#128+64
+	ldp	x21,x22,[x29,#32]
+	ldp	x23,x24,[x29,#48]
+	ldp	x25,x26,[x29,#64]
+	ldp	x27,x28,[x29,#80]
+	ldp	x29,x30,[sp],#96
+	ret
+.size	ChaCha20_512_neon,.-ChaCha20_512_neon
+___
+}
+}}}
+
+foreach (split("\n",$code)) {
+	s/\`([^\`]*)\`/eval $1/geo;
+
+	(s/\b([a-z]+)\.32\b/$1/ and (s/x([0-9]+)/w$1/g or 1))	or
+	(m/\b(eor|ext|mov)\b/ and (s/\.4s/\.16b/g or 1))	or
+	(s/\b((?:ld|st)1)\.8\b/$1/ and (s/\.4s/\.16b/g or 1))	or
+	(m/\b(ld|st)[rp]\b/ and (s/v([0-9]+)\.4s/q$1/g or 1))	or
+	(s/\brev32\.16\b/rev32/ and (s/\.4s/\.8h/g or 1));
+
+	#s/\bq([0-9]+)#(lo|hi)/sprintf "d%d",2*$1+($2 eq "hi")/geo;
+
+	print $_,"\n";
+}
+close STDOUT;	# flush
-- 
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