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-rw-r--r--arch/arm/crypto/poly1305-armv4.pl1236
1 files changed, 1236 insertions, 0 deletions
diff --git a/arch/arm/crypto/poly1305-armv4.pl b/arch/arm/crypto/poly1305-armv4.pl
new file mode 100644
index 000000000000..6d79498d3115
--- /dev/null
+++ b/arch/arm/crypto/poly1305-armv4.pl
@@ -0,0 +1,1236 @@
+#!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-1.0+ OR BSD-3-Clause
+#
+# ====================================================================
+# Written by Andy Polyakov, @dot-asm, initially for the OpenSSL
+# project.
+# ====================================================================
+#
+# IALU(*)/gcc-4.4 NEON
+#
+# ARM11xx(ARMv6) 7.78/+100% -
+# Cortex-A5 6.35/+130% 3.00
+# Cortex-A8 6.25/+115% 2.36
+# Cortex-A9 5.10/+95% 2.55
+# Cortex-A15 3.85/+85% 1.25(**)
+# Snapdragon S4 5.70/+100% 1.48(**)
+#
+# (*) this is for -march=armv6, i.e. with bunch of ldrb loading data;
+# (**) these are trade-off results, they can be improved by ~8% but at
+# the cost of 15/12% regression on Cortex-A5/A7, it's even possible
+# to improve Cortex-A9 result, but then A5/A7 loose more than 20%;
+
+$flavour = shift;
+if ($flavour=~/\w[\w\-]*\.\w+$/) { $output=$flavour; undef $flavour; }
+else { while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {} }
+
+if ($flavour && $flavour ne "void") {
+ $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
+ ( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
+ ( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
+ die "can't locate arm-xlate.pl";
+
+ open STDOUT,"| \"$^X\" $xlate $flavour $output";
+} else {
+ open STDOUT,">$output";
+}
+
+($ctx,$inp,$len,$padbit)=map("r$_",(0..3));
+
+$code.=<<___;
+#ifndef __KERNEL__
+# include "arm_arch.h"
+#else
+# define __ARM_ARCH__ __LINUX_ARM_ARCH__
+# define __ARM_MAX_ARCH__ __LINUX_ARM_ARCH__
+# define poly1305_init poly1305_init_arm
+# define poly1305_blocks poly1305_blocks_arm
+# define poly1305_emit poly1305_emit_arm
+.globl poly1305_blocks_neon
+#endif
+
+#if defined(__thumb2__)
+.syntax unified
+.thumb
+#else
+.code 32
+#endif
+
+.text
+
+.globl poly1305_emit
+.globl poly1305_blocks
+.globl poly1305_init
+.type poly1305_init,%function
+.align 5
+poly1305_init:
+.Lpoly1305_init:
+ stmdb sp!,{r4-r11}
+
+ eor r3,r3,r3
+ cmp $inp,#0
+ str r3,[$ctx,#0] @ zero hash value
+ str r3,[$ctx,#4]
+ str r3,[$ctx,#8]
+ str r3,[$ctx,#12]
+ str r3,[$ctx,#16]
+ str r3,[$ctx,#36] @ clear is_base2_26
+ add $ctx,$ctx,#20
+
+#ifdef __thumb2__
+ it eq
+#endif
+ moveq r0,#0
+ beq .Lno_key
+
+#if __ARM_MAX_ARCH__>=7
+ mov r3,#-1
+ str r3,[$ctx,#28] @ impossible key power value
+# ifndef __KERNEL__
+ adr r11,.Lpoly1305_init
+ ldr r12,.LOPENSSL_armcap
+# endif
+#endif
+ ldrb r4,[$inp,#0]
+ mov r10,#0x0fffffff
+ ldrb r5,[$inp,#1]
+ and r3,r10,#-4 @ 0x0ffffffc
+ ldrb r6,[$inp,#2]
+ ldrb r7,[$inp,#3]
+ orr r4,r4,r5,lsl#8
+ ldrb r5,[$inp,#4]
+ orr r4,r4,r6,lsl#16
+ ldrb r6,[$inp,#5]
+ orr r4,r4,r7,lsl#24
+ ldrb r7,[$inp,#6]
+ and r4,r4,r10
+
+#if __ARM_MAX_ARCH__>=7 && !defined(__KERNEL__)
+# if !defined(_WIN32)
+ ldr r12,[r11,r12] @ OPENSSL_armcap_P
+# endif
+# if defined(__APPLE__) || defined(_WIN32)
+ ldr r12,[r12]
+# endif
+#endif
+ ldrb r8,[$inp,#7]
+ orr r5,r5,r6,lsl#8
+ ldrb r6,[$inp,#8]
+ orr r5,r5,r7,lsl#16
+ ldrb r7,[$inp,#9]
+ orr r5,r5,r8,lsl#24
+ ldrb r8,[$inp,#10]
+ and r5,r5,r3
+
+#if __ARM_MAX_ARCH__>=7 && !defined(__KERNEL__)
+ tst r12,#ARMV7_NEON @ check for NEON
+# ifdef __thumb2__
+ adr r9,.Lpoly1305_blocks_neon
+ adr r11,.Lpoly1305_blocks
+ it ne
+ movne r11,r9
+ adr r12,.Lpoly1305_emit
+ orr r11,r11,#1 @ thumb-ify addresses
+ orr r12,r12,#1
+# else
+ add r12,r11,#(.Lpoly1305_emit-.Lpoly1305_init)
+ ite eq
+ addeq r11,r11,#(.Lpoly1305_blocks-.Lpoly1305_init)
+ addne r11,r11,#(.Lpoly1305_blocks_neon-.Lpoly1305_init)
+# endif
+#endif
+ ldrb r9,[$inp,#11]
+ orr r6,r6,r7,lsl#8
+ ldrb r7,[$inp,#12]
+ orr r6,r6,r8,lsl#16
+ ldrb r8,[$inp,#13]
+ orr r6,r6,r9,lsl#24
+ ldrb r9,[$inp,#14]
+ and r6,r6,r3
+
+ ldrb r10,[$inp,#15]
+ orr r7,r7,r8,lsl#8
+ str r4,[$ctx,#0]
+ orr r7,r7,r9,lsl#16
+ str r5,[$ctx,#4]
+ orr r7,r7,r10,lsl#24
+ str r6,[$ctx,#8]
+ and r7,r7,r3
+ str r7,[$ctx,#12]
+#if __ARM_MAX_ARCH__>=7 && !defined(__KERNEL__)
+ stmia r2,{r11,r12} @ fill functions table
+ mov r0,#1
+#else
+ mov r0,#0
+#endif
+.Lno_key:
+ ldmia sp!,{r4-r11}
+#if __ARM_ARCH__>=5
+ ret @ bx lr
+#else
+ tst lr,#1
+ moveq pc,lr @ be binary compatible with V4, yet
+ bx lr @ interoperable with Thumb ISA:-)
+#endif
+.size poly1305_init,.-poly1305_init
+___
+{
+my ($h0,$h1,$h2,$h3,$h4,$r0,$r1,$r2,$r3)=map("r$_",(4..12));
+my ($s1,$s2,$s3)=($r1,$r2,$r3);
+
+$code.=<<___;
+.type poly1305_blocks,%function
+.align 5
+poly1305_blocks:
+.Lpoly1305_blocks:
+ stmdb sp!,{r3-r11,lr}
+
+ ands $len,$len,#-16
+ beq .Lno_data
+
+ add $len,$len,$inp @ end pointer
+ sub sp,sp,#32
+
+#if __ARM_ARCH__<7
+ ldmia $ctx,{$h0-$r3} @ load context
+ add $ctx,$ctx,#20
+ str $len,[sp,#16] @ offload stuff
+ str $ctx,[sp,#12]
+#else
+ ldr lr,[$ctx,#36] @ is_base2_26
+ ldmia $ctx!,{$h0-$h4} @ load hash value
+ str $len,[sp,#16] @ offload stuff
+ str $ctx,[sp,#12]
+
+ adds $r0,$h0,$h1,lsl#26 @ base 2^26 -> base 2^32
+ mov $r1,$h1,lsr#6
+ adcs $r1,$r1,$h2,lsl#20
+ mov $r2,$h2,lsr#12
+ adcs $r2,$r2,$h3,lsl#14
+ mov $r3,$h3,lsr#18
+ adcs $r3,$r3,$h4,lsl#8
+ mov $len,#0
+ teq lr,#0
+ str $len,[$ctx,#16] @ clear is_base2_26
+ adc $len,$len,$h4,lsr#24
+
+ itttt ne
+ movne $h0,$r0 @ choose between radixes
+ movne $h1,$r1
+ movne $h2,$r2
+ movne $h3,$r3
+ ldmia $ctx,{$r0-$r3} @ load key
+ it ne
+ movne $h4,$len
+#endif
+
+ mov lr,$inp
+ cmp $padbit,#0
+ str $r1,[sp,#20]
+ str $r2,[sp,#24]
+ str $r3,[sp,#28]
+ b .Loop
+
+.align 4
+.Loop:
+#if __ARM_ARCH__<7
+ ldrb r0,[lr],#16 @ load input
+# ifdef __thumb2__
+ it hi
+# endif
+ addhi $h4,$h4,#1 @ 1<<128
+ ldrb r1,[lr,#-15]
+ ldrb r2,[lr,#-14]
+ ldrb r3,[lr,#-13]
+ orr r1,r0,r1,lsl#8
+ ldrb r0,[lr,#-12]
+ orr r2,r1,r2,lsl#16
+ ldrb r1,[lr,#-11]
+ orr r3,r2,r3,lsl#24
+ ldrb r2,[lr,#-10]
+ adds $h0,$h0,r3 @ accumulate input
+
+ ldrb r3,[lr,#-9]
+ orr r1,r0,r1,lsl#8
+ ldrb r0,[lr,#-8]
+ orr r2,r1,r2,lsl#16
+ ldrb r1,[lr,#-7]
+ orr r3,r2,r3,lsl#24
+ ldrb r2,[lr,#-6]
+ adcs $h1,$h1,r3
+
+ ldrb r3,[lr,#-5]
+ orr r1,r0,r1,lsl#8
+ ldrb r0,[lr,#-4]
+ orr r2,r1,r2,lsl#16
+ ldrb r1,[lr,#-3]
+ orr r3,r2,r3,lsl#24
+ ldrb r2,[lr,#-2]
+ adcs $h2,$h2,r3
+
+ ldrb r3,[lr,#-1]
+ orr r1,r0,r1,lsl#8
+ str lr,[sp,#8] @ offload input pointer
+ orr r2,r1,r2,lsl#16
+ add $s1,$r1,$r1,lsr#2
+ orr r3,r2,r3,lsl#24
+#else
+ ldr r0,[lr],#16 @ load input
+ it hi
+ addhi $h4,$h4,#1 @ padbit
+ ldr r1,[lr,#-12]
+ ldr r2,[lr,#-8]
+ ldr r3,[lr,#-4]
+# ifdef __ARMEB__
+ rev r0,r0
+ rev r1,r1
+ rev r2,r2
+ rev r3,r3
+# endif
+ adds $h0,$h0,r0 @ accumulate input
+ str lr,[sp,#8] @ offload input pointer
+ adcs $h1,$h1,r1
+ add $s1,$r1,$r1,lsr#2
+ adcs $h2,$h2,r2
+#endif
+ add $s2,$r2,$r2,lsr#2
+ adcs $h3,$h3,r3
+ add $s3,$r3,$r3,lsr#2
+
+ umull r2,r3,$h1,$r0
+ adc $h4,$h4,#0
+ umull r0,r1,$h0,$r0
+ umlal r2,r3,$h4,$s1
+ umlal r0,r1,$h3,$s1
+ ldr $r1,[sp,#20] @ reload $r1
+ umlal r2,r3,$h2,$s3
+ umlal r0,r1,$h1,$s3
+ umlal r2,r3,$h3,$s2
+ umlal r0,r1,$h2,$s2
+ umlal r2,r3,$h0,$r1
+ str r0,[sp,#0] @ future $h0
+ mul r0,$s2,$h4
+ ldr $r2,[sp,#24] @ reload $r2
+ adds r2,r2,r1 @ d1+=d0>>32
+ eor r1,r1,r1
+ adc lr,r3,#0 @ future $h2
+ str r2,[sp,#4] @ future $h1
+
+ mul r2,$s3,$h4
+ eor r3,r3,r3
+ umlal r0,r1,$h3,$s3
+ ldr $r3,[sp,#28] @ reload $r3
+ umlal r2,r3,$h3,$r0
+ umlal r0,r1,$h2,$r0
+ umlal r2,r3,$h2,$r1
+ umlal r0,r1,$h1,$r1
+ umlal r2,r3,$h1,$r2
+ umlal r0,r1,$h0,$r2
+ umlal r2,r3,$h0,$r3
+ ldr $h0,[sp,#0]
+ mul $h4,$r0,$h4
+ ldr $h1,[sp,#4]
+
+ adds $h2,lr,r0 @ d2+=d1>>32
+ ldr lr,[sp,#8] @ reload input pointer
+ adc r1,r1,#0
+ adds $h3,r2,r1 @ d3+=d2>>32
+ ldr r0,[sp,#16] @ reload end pointer
+ adc r3,r3,#0
+ add $h4,$h4,r3 @ h4+=d3>>32
+
+ and r1,$h4,#-4
+ and $h4,$h4,#3
+ add r1,r1,r1,lsr#2 @ *=5
+ adds $h0,$h0,r1
+ adcs $h1,$h1,#0
+ adcs $h2,$h2,#0
+ adcs $h3,$h3,#0
+ adc $h4,$h4,#0
+
+ cmp r0,lr @ done yet?
+ bhi .Loop
+
+ ldr $ctx,[sp,#12]
+ add sp,sp,#32
+ stmdb $ctx,{$h0-$h4} @ store the result
+
+.Lno_data:
+#if __ARM_ARCH__>=5
+ ldmia sp!,{r3-r11,pc}
+#else
+ ldmia sp!,{r3-r11,lr}
+ tst lr,#1
+ moveq pc,lr @ be binary compatible with V4, yet
+ bx lr @ interoperable with Thumb ISA:-)
+#endif
+.size poly1305_blocks,.-poly1305_blocks
+___
+}
+{
+my ($ctx,$mac,$nonce)=map("r$_",(0..2));
+my ($h0,$h1,$h2,$h3,$h4,$g0,$g1,$g2,$g3)=map("r$_",(3..11));
+my $g4=$ctx;
+
+$code.=<<___;
+.type poly1305_emit,%function
+.align 5
+poly1305_emit:
+.Lpoly1305_emit:
+ stmdb sp!,{r4-r11}
+
+ ldmia $ctx,{$h0-$h4}
+
+#if __ARM_ARCH__>=7
+ ldr ip,[$ctx,#36] @ is_base2_26
+
+ adds $g0,$h0,$h1,lsl#26 @ base 2^26 -> base 2^32
+ mov $g1,$h1,lsr#6
+ adcs $g1,$g1,$h2,lsl#20
+ mov $g2,$h2,lsr#12
+ adcs $g2,$g2,$h3,lsl#14
+ mov $g3,$h3,lsr#18
+ adcs $g3,$g3,$h4,lsl#8
+ mov $g4,#0
+ adc $g4,$g4,$h4,lsr#24
+
+ tst ip,ip
+ itttt ne
+ movne $h0,$g0
+ movne $h1,$g1
+ movne $h2,$g2
+ movne $h3,$g3
+ it ne
+ movne $h4,$g4
+#endif
+
+ adds $g0,$h0,#5 @ compare to modulus
+ adcs $g1,$h1,#0
+ adcs $g2,$h2,#0
+ adcs $g3,$h3,#0
+ adc $g4,$h4,#0
+ tst $g4,#4 @ did it carry/borrow?
+
+#ifdef __thumb2__
+ it ne
+#endif
+ movne $h0,$g0
+ ldr $g0,[$nonce,#0]
+#ifdef __thumb2__
+ it ne
+#endif
+ movne $h1,$g1
+ ldr $g1,[$nonce,#4]
+#ifdef __thumb2__
+ it ne
+#endif
+ movne $h2,$g2
+ ldr $g2,[$nonce,#8]
+#ifdef __thumb2__
+ it ne
+#endif
+ movne $h3,$g3
+ ldr $g3,[$nonce,#12]
+
+ adds $h0,$h0,$g0
+ adcs $h1,$h1,$g1
+ adcs $h2,$h2,$g2
+ adc $h3,$h3,$g3
+
+#if __ARM_ARCH__>=7
+# ifdef __ARMEB__
+ rev $h0,$h0
+ rev $h1,$h1
+ rev $h2,$h2
+ rev $h3,$h3
+# endif
+ str $h0,[$mac,#0]
+ str $h1,[$mac,#4]
+ str $h2,[$mac,#8]
+ str $h3,[$mac,#12]
+#else
+ strb $h0,[$mac,#0]
+ mov $h0,$h0,lsr#8
+ strb $h1,[$mac,#4]
+ mov $h1,$h1,lsr#8
+ strb $h2,[$mac,#8]
+ mov $h2,$h2,lsr#8
+ strb $h3,[$mac,#12]
+ mov $h3,$h3,lsr#8
+
+ strb $h0,[$mac,#1]
+ mov $h0,$h0,lsr#8
+ strb $h1,[$mac,#5]
+ mov $h1,$h1,lsr#8
+ strb $h2,[$mac,#9]
+ mov $h2,$h2,lsr#8
+ strb $h3,[$mac,#13]
+ mov $h3,$h3,lsr#8
+
+ strb $h0,[$mac,#2]
+ mov $h0,$h0,lsr#8
+ strb $h1,[$mac,#6]
+ mov $h1,$h1,lsr#8
+ strb $h2,[$mac,#10]
+ mov $h2,$h2,lsr#8
+ strb $h3,[$mac,#14]
+ mov $h3,$h3,lsr#8
+
+ strb $h0,[$mac,#3]
+ strb $h1,[$mac,#7]
+ strb $h2,[$mac,#11]
+ strb $h3,[$mac,#15]
+#endif
+ ldmia sp!,{r4-r11}
+#if __ARM_ARCH__>=5
+ ret @ bx lr
+#else
+ tst lr,#1
+ moveq pc,lr @ be binary compatible with V4, yet
+ bx lr @ interoperable with Thumb ISA:-)
+#endif
+.size poly1305_emit,.-poly1305_emit
+___
+{
+my ($R0,$R1,$S1,$R2,$S2,$R3,$S3,$R4,$S4) = map("d$_",(0..9));
+my ($D0,$D1,$D2,$D3,$D4, $H0,$H1,$H2,$H3,$H4) = map("q$_",(5..14));
+my ($T0,$T1,$MASK) = map("q$_",(15,4,0));
+
+my ($in2,$zeros,$tbl0,$tbl1) = map("r$_",(4..7));
+
+$code.=<<___;
+#if __ARM_MAX_ARCH__>=7
+.fpu neon
+
+.type poly1305_init_neon,%function
+.align 5
+poly1305_init_neon:
+.Lpoly1305_init_neon:
+ ldr r3,[$ctx,#48] @ first table element
+ cmp r3,#-1 @ is value impossible?
+ bne .Lno_init_neon
+
+ ldr r4,[$ctx,#20] @ load key base 2^32
+ ldr r5,[$ctx,#24]
+ ldr r6,[$ctx,#28]
+ ldr r7,[$ctx,#32]
+
+ and r2,r4,#0x03ffffff @ base 2^32 -> base 2^26
+ mov r3,r4,lsr#26
+ mov r4,r5,lsr#20
+ orr r3,r3,r5,lsl#6
+ mov r5,r6,lsr#14
+ orr r4,r4,r6,lsl#12
+ mov r6,r7,lsr#8
+ orr r5,r5,r7,lsl#18
+ and r3,r3,#0x03ffffff
+ and r4,r4,#0x03ffffff
+ and r5,r5,#0x03ffffff
+
+ vdup.32 $R0,r2 @ r^1 in both lanes
+ add r2,r3,r3,lsl#2 @ *5
+ vdup.32 $R1,r3
+ add r3,r4,r4,lsl#2
+ vdup.32 $S1,r2
+ vdup.32 $R2,r4
+ add r4,r5,r5,lsl#2
+ vdup.32 $S2,r3
+ vdup.32 $R3,r5
+ add r5,r6,r6,lsl#2
+ vdup.32 $S3,r4
+ vdup.32 $R4,r6
+ vdup.32 $S4,r5
+
+ mov $zeros,#2 @ counter
+
+.Lsquare_neon:
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ d0 = h0*r0 + h4*5*r1 + h3*5*r2 + h2*5*r3 + h1*5*r4
+ @ d1 = h1*r0 + h0*r1 + h4*5*r2 + h3*5*r3 + h2*5*r4
+ @ d2 = h2*r0 + h1*r1 + h0*r2 + h4*5*r3 + h3*5*r4
+ @ d3 = h3*r0 + h2*r1 + h1*r2 + h0*r3 + h4*5*r4
+ @ d4 = h4*r0 + h3*r1 + h2*r2 + h1*r3 + h0*r4
+
+ vmull.u32 $D0,$R0,${R0}[1]
+ vmull.u32 $D1,$R1,${R0}[1]
+ vmull.u32 $D2,$R2,${R0}[1]
+ vmull.u32 $D3,$R3,${R0}[1]
+ vmull.u32 $D4,$R4,${R0}[1]
+
+ vmlal.u32 $D0,$R4,${S1}[1]
+ vmlal.u32 $D1,$R0,${R1}[1]
+ vmlal.u32 $D2,$R1,${R1}[1]
+ vmlal.u32 $D3,$R2,${R1}[1]
+ vmlal.u32 $D4,$R3,${R1}[1]
+
+ vmlal.u32 $D0,$R3,${S2}[1]
+ vmlal.u32 $D1,$R4,${S2}[1]
+ vmlal.u32 $D3,$R1,${R2}[1]
+ vmlal.u32 $D2,$R0,${R2}[1]
+ vmlal.u32 $D4,$R2,${R2}[1]
+
+ vmlal.u32 $D0,$R2,${S3}[1]
+ vmlal.u32 $D3,$R0,${R3}[1]
+ vmlal.u32 $D1,$R3,${S3}[1]
+ vmlal.u32 $D2,$R4,${S3}[1]
+ vmlal.u32 $D4,$R1,${R3}[1]
+
+ vmlal.u32 $D3,$R4,${S4}[1]
+ vmlal.u32 $D0,$R1,${S4}[1]
+ vmlal.u32 $D1,$R2,${S4}[1]
+ vmlal.u32 $D2,$R3,${S4}[1]
+ vmlal.u32 $D4,$R0,${R4}[1]
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ lazy reduction as discussed in "NEON crypto" by D.J. Bernstein
+ @ and P. Schwabe
+ @
+ @ H0>>+H1>>+H2>>+H3>>+H4
+ @ H3>>+H4>>*5+H0>>+H1
+ @
+ @ Trivia.
+ @
+ @ Result of multiplication of n-bit number by m-bit number is
+ @ n+m bits wide. However! Even though 2^n is a n+1-bit number,
+ @ m-bit number multiplied by 2^n is still n+m bits wide.
+ @
+ @ Sum of two n-bit numbers is n+1 bits wide, sum of three - n+2,
+ @ and so is sum of four. Sum of 2^m n-m-bit numbers and n-bit
+ @ one is n+1 bits wide.
+ @
+ @ >>+ denotes Hnext += Hn>>26, Hn &= 0x3ffffff. This means that
+ @ H0, H2, H3 are guaranteed to be 26 bits wide, while H1 and H4
+ @ can be 27. However! In cases when their width exceeds 26 bits
+ @ they are limited by 2^26+2^6. This in turn means that *sum*
+ @ of the products with these values can still be viewed as sum
+ @ of 52-bit numbers as long as the amount of addends is not a
+ @ power of 2. For example,
+ @
+ @ H4 = H4*R0 + H3*R1 + H2*R2 + H1*R3 + H0 * R4,
+ @
+ @ which can't be larger than 5 * (2^26 + 2^6) * (2^26 + 2^6), or
+ @ 5 * (2^52 + 2*2^32 + 2^12), which in turn is smaller than
+ @ 8 * (2^52) or 2^55. However, the value is then multiplied by
+ @ by 5, so we should be looking at 5 * 5 * (2^52 + 2^33 + 2^12),
+ @ which is less than 32 * (2^52) or 2^57. And when processing
+ @ data we are looking at triple as many addends...
+ @
+ @ In key setup procedure pre-reduced H0 is limited by 5*4+1 and
+ @ 5*H4 - by 5*5 52-bit addends, or 57 bits. But when hashing the
+ @ input H0 is limited by (5*4+1)*3 addends, or 58 bits, while
+ @ 5*H4 by 5*5*3, or 59[!] bits. How is this relevant? vmlal.u32
+ @ instruction accepts 2x32-bit input and writes 2x64-bit result.
+ @ This means that result of reduction have to be compressed upon
+ @ loop wrap-around. This can be done in the process of reduction
+ @ to minimize amount of instructions [as well as amount of
+ @ 128-bit instructions, which benefits low-end processors], but
+ @ one has to watch for H2 (which is narrower than H0) and 5*H4
+ @ not being wider than 58 bits, so that result of right shift
+ @ by 26 bits fits in 32 bits. This is also useful on x86,
+ @ because it allows to use paddd in place for paddq, which
+ @ benefits Atom, where paddq is ridiculously slow.
+
+ vshr.u64 $T0,$D3,#26
+ vmovn.i64 $D3#lo,$D3
+ vshr.u64 $T1,$D0,#26
+ vmovn.i64 $D0#lo,$D0
+ vadd.i64 $D4,$D4,$T0 @ h3 -> h4
+ vbic.i32 $D3#lo,#0xfc000000 @ &=0x03ffffff
+ vadd.i64 $D1,$D1,$T1 @ h0 -> h1
+ vbic.i32 $D0#lo,#0xfc000000
+
+ vshrn.u64 $T0#lo,$D4,#26
+ vmovn.i64 $D4#lo,$D4
+ vshr.u64 $T1,$D1,#26
+ vmovn.i64 $D1#lo,$D1
+ vadd.i64 $D2,$D2,$T1 @ h1 -> h2
+ vbic.i32 $D4#lo,#0xfc000000
+ vbic.i32 $D1#lo,#0xfc000000
+
+ vadd.i32 $D0#lo,$D0#lo,$T0#lo
+ vshl.u32 $T0#lo,$T0#lo,#2
+ vshrn.u64 $T1#lo,$D2,#26
+ vmovn.i64 $D2#lo,$D2
+ vadd.i32 $D0#lo,$D0#lo,$T0#lo @ h4 -> h0
+ vadd.i32 $D3#lo,$D3#lo,$T1#lo @ h2 -> h3
+ vbic.i32 $D2#lo,#0xfc000000
+
+ vshr.u32 $T0#lo,$D0#lo,#26
+ vbic.i32 $D0#lo,#0xfc000000
+ vshr.u32 $T1#lo,$D3#lo,#26
+ vbic.i32 $D3#lo,#0xfc000000
+ vadd.i32 $D1#lo,$D1#lo,$T0#lo @ h0 -> h1
+ vadd.i32 $D4#lo,$D4#lo,$T1#lo @ h3 -> h4
+
+ subs $zeros,$zeros,#1
+ beq .Lsquare_break_neon
+
+ add $tbl0,$ctx,#(48+0*9*4)
+ add $tbl1,$ctx,#(48+1*9*4)
+
+ vtrn.32 $R0,$D0#lo @ r^2:r^1
+ vtrn.32 $R2,$D2#lo
+ vtrn.32 $R3,$D3#lo
+ vtrn.32 $R1,$D1#lo
+ vtrn.32 $R4,$D4#lo
+
+ vshl.u32 $S2,$R2,#2 @ *5
+ vshl.u32 $S3,$R3,#2
+ vshl.u32 $S1,$R1,#2
+ vshl.u32 $S4,$R4,#2
+ vadd.i32 $S2,$S2,$R2
+ vadd.i32 $S1,$S1,$R1
+ vadd.i32 $S3,$S3,$R3
+ vadd.i32 $S4,$S4,$R4
+
+ vst4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]!
+ vst4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]!
+ vst4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
+ vst4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
+ vst1.32 {${S4}[0]},[$tbl0,:32]
+ vst1.32 {${S4}[1]},[$tbl1,:32]
+
+ b .Lsquare_neon
+
+.align 4
+.Lsquare_break_neon:
+ add $tbl0,$ctx,#(48+2*4*9)
+ add $tbl1,$ctx,#(48+3*4*9)
+
+ vmov $R0,$D0#lo @ r^4:r^3
+ vshl.u32 $S1,$D1#lo,#2 @ *5
+ vmov $R1,$D1#lo
+ vshl.u32 $S2,$D2#lo,#2
+ vmov $R2,$D2#lo
+ vshl.u32 $S3,$D3#lo,#2
+ vmov $R3,$D3#lo
+ vshl.u32 $S4,$D4#lo,#2
+ vmov $R4,$D4#lo
+ vadd.i32 $S1,$S1,$D1#lo
+ vadd.i32 $S2,$S2,$D2#lo
+ vadd.i32 $S3,$S3,$D3#lo
+ vadd.i32 $S4,$S4,$D4#lo
+
+ vst4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]!
+ vst4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]!
+ vst4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
+ vst4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
+ vst1.32 {${S4}[0]},[$tbl0]
+ vst1.32 {${S4}[1]},[$tbl1]
+
+.Lno_init_neon:
+ ret @ bx lr
+.size poly1305_init_neon,.-poly1305_init_neon
+
+.type poly1305_blocks_neon,%function
+.align 5
+poly1305_blocks_neon:
+.Lpoly1305_blocks_neon:
+ ldr ip,[$ctx,#36] @ is_base2_26
+
+ cmp $len,#64
+ blo .Lpoly1305_blocks
+
+ stmdb sp!,{r4-r7}
+ vstmdb sp!,{d8-d15} @ ABI specification says so
+
+ tst ip,ip @ is_base2_26?
+ bne .Lbase2_26_neon
+
+ stmdb sp!,{r1-r3,lr}
+ bl .Lpoly1305_init_neon
+
+ ldr r4,[$ctx,#0] @ load hash value base 2^32
+ ldr r5,[$ctx,#4]
+ ldr r6,[$ctx,#8]
+ ldr r7,[$ctx,#12]
+ ldr ip,[$ctx,#16]
+
+ and r2,r4,#0x03ffffff @ base 2^32 -> base 2^26
+ mov r3,r4,lsr#26
+ veor $D0#lo,$D0#lo,$D0#lo
+ mov r4,r5,lsr#20
+ orr r3,r3,r5,lsl#6
+ veor $D1#lo,$D1#lo,$D1#lo
+ mov r5,r6,lsr#14
+ orr r4,r4,r6,lsl#12
+ veor $D2#lo,$D2#lo,$D2#lo
+ mov r6,r7,lsr#8
+ orr r5,r5,r7,lsl#18
+ veor $D3#lo,$D3#lo,$D3#lo
+ and r3,r3,#0x03ffffff
+ orr r6,r6,ip,lsl#24
+ veor $D4#lo,$D4#lo,$D4#lo
+ and r4,r4,#0x03ffffff
+ mov r1,#1
+ and r5,r5,#0x03ffffff
+ str r1,[$ctx,#36] @ set is_base2_26
+
+ vmov.32 $D0#lo[0],r2
+ vmov.32 $D1#lo[0],r3
+ vmov.32 $D2#lo[0],r4
+ vmov.32 $D3#lo[0],r5
+ vmov.32 $D4#lo[0],r6
+ adr $zeros,.Lzeros
+
+ ldmia sp!,{r1-r3,lr}
+ b .Lhash_loaded
+
+.align 4
+.Lbase2_26_neon:
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ load hash value
+
+ veor $D0#lo,$D0#lo,$D0#lo
+ veor $D1#lo,$D1#lo,$D1#lo
+ veor $D2#lo,$D2#lo,$D2#lo
+ veor $D3#lo,$D3#lo,$D3#lo
+ veor $D4#lo,$D4#lo,$D4#lo
+ vld4.32 {$D0#lo[0],$D1#lo[0],$D2#lo[0],$D3#lo[0]},[$ctx]!
+ adr $zeros,.Lzeros
+ vld1.32 {$D4#lo[0]},[$ctx]
+ sub $ctx,$ctx,#16 @ rewind
+
+.Lhash_loaded:
+ add $in2,$inp,#32
+ mov $padbit,$padbit,lsl#24
+ tst $len,#31
+ beq .Leven
+
+ vld4.32 {$H0#lo[0],$H1#lo[0],$H2#lo[0],$H3#lo[0]},[$inp]!
+ vmov.32 $H4#lo[0],$padbit
+ sub $len,$len,#16
+ add $in2,$inp,#32
+
+# ifdef __ARMEB__
+ vrev32.8 $H0,$H0
+ vrev32.8 $H3,$H3
+ vrev32.8 $H1,$H1
+ vrev32.8 $H2,$H2
+# endif
+ vsri.u32 $H4#lo,$H3#lo,#8 @ base 2^32 -> base 2^26
+ vshl.u32 $H3#lo,$H3#lo,#18
+
+ vsri.u32 $H3#lo,$H2#lo,#14
+ vshl.u32 $H2#lo,$H2#lo,#12
+ vadd.i32 $H4#hi,$H4#lo,$D4#lo @ add hash value and move to #hi
+
+ vbic.i32 $H3#lo,#0xfc000000
+ vsri.u32 $H2#lo,$H1#lo,#20
+ vshl.u32 $H1#lo,$H1#lo,#6
+
+ vbic.i32 $H2#lo,#0xfc000000
+ vsri.u32 $H1#lo,$H0#lo,#26
+ vadd.i32 $H3#hi,$H3#lo,$D3#lo
+
+ vbic.i32 $H0#lo,#0xfc000000
+ vbic.i32 $H1#lo,#0xfc000000
+ vadd.i32 $H2#hi,$H2#lo,$D2#lo
+
+ vadd.i32 $H0#hi,$H0#lo,$D0#lo
+ vadd.i32 $H1#hi,$H1#lo,$D1#lo
+
+ mov $tbl1,$zeros
+ add $tbl0,$ctx,#48
+
+ cmp $len,$len
+ b .Long_tail
+
+.align 4
+.Leven:
+ subs $len,$len,#64
+ it lo
+ movlo $in2,$zeros
+
+ vmov.i32 $H4,#1<<24 @ padbit, yes, always
+ vld4.32 {$H0#lo,$H1#lo,$H2#lo,$H3#lo},[$inp] @ inp[0:1]
+ add $inp,$inp,#64
+ vld4.32 {$H0#hi,$H1#hi,$H2#hi,$H3#hi},[$in2] @ inp[2:3] (or 0)
+ add $in2,$in2,#64
+ itt hi
+ addhi $tbl1,$ctx,#(48+1*9*4)
+ addhi $tbl0,$ctx,#(48+3*9*4)
+
+# ifdef __ARMEB__
+ vrev32.8 $H0,$H0
+ vrev32.8 $H3,$H3
+ vrev32.8 $H1,$H1
+ vrev32.8 $H2,$H2
+# endif
+ vsri.u32 $H4,$H3,#8 @ base 2^32 -> base 2^26
+ vshl.u32 $H3,$H3,#18
+
+ vsri.u32 $H3,$H2,#14
+ vshl.u32 $H2,$H2,#12
+
+ vbic.i32 $H3,#0xfc000000
+ vsri.u32 $H2,$H1,#20
+ vshl.u32 $H1,$H1,#6
+
+ vbic.i32 $H2,#0xfc000000
+ vsri.u32 $H1,$H0,#26
+
+ vbic.i32 $H0,#0xfc000000
+ vbic.i32 $H1,#0xfc000000
+
+ bls .Lskip_loop
+
+ vld4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]! @ load r^2
+ vld4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]! @ load r^4
+ vld4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
+ vld4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
+ b .Loop_neon
+
+.align 5
+.Loop_neon:
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ ((inp[0]*r^4+inp[2]*r^2+inp[4])*r^4+inp[6]*r^2
+ @ ((inp[1]*r^4+inp[3]*r^2+inp[5])*r^3+inp[7]*r
+ @ \___________________/
+ @ ((inp[0]*r^4+inp[2]*r^2+inp[4])*r^4+inp[6]*r^2+inp[8])*r^2
+ @ ((inp[1]*r^4+inp[3]*r^2+inp[5])*r^4+inp[7]*r^2+inp[9])*r
+ @ \___________________/ \____________________/
+ @
+ @ Note that we start with inp[2:3]*r^2. This is because it
+ @ doesn't depend on reduction in previous iteration.
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ d4 = h4*r0 + h3*r1 + h2*r2 + h1*r3 + h0*r4
+ @ d3 = h3*r0 + h2*r1 + h1*r2 + h0*r3 + h4*5*r4
+ @ d2 = h2*r0 + h1*r1 + h0*r2 + h4*5*r3 + h3*5*r4
+ @ d1 = h1*r0 + h0*r1 + h4*5*r2 + h3*5*r3 + h2*5*r4
+ @ d0 = h0*r0 + h4*5*r1 + h3*5*r2 + h2*5*r3 + h1*5*r4
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ inp[2:3]*r^2
+
+ vadd.i32 $H2#lo,$H2#lo,$D2#lo @ accumulate inp[0:1]
+ vmull.u32 $D2,$H2#hi,${R0}[1]
+ vadd.i32 $H0#lo,$H0#lo,$D0#lo
+ vmull.u32 $D0,$H0#hi,${R0}[1]
+ vadd.i32 $H3#lo,$H3#lo,$D3#lo
+ vmull.u32 $D3,$H3#hi,${R0}[1]
+ vmlal.u32 $D2,$H1#hi,${R1}[1]
+ vadd.i32 $H1#lo,$H1#lo,$D1#lo
+ vmull.u32 $D1,$H1#hi,${R0}[1]
+
+ vadd.i32 $H4#lo,$H4#lo,$D4#lo
+ vmull.u32 $D4,$H4#hi,${R0}[1]
+ subs $len,$len,#64
+ vmlal.u32 $D0,$H4#hi,${S1}[1]
+ it lo
+ movlo $in2,$zeros
+ vmlal.u32 $D3,$H2#hi,${R1}[1]
+ vld1.32 ${S4}[1],[$tbl1,:32]
+ vmlal.u32 $D1,$H0#hi,${R1}[1]
+ vmlal.u32 $D4,$H3#hi,${R1}[1]
+
+ vmlal.u32 $D0,$H3#hi,${S2}[1]
+ vmlal.u32 $D3,$H1#hi,${R2}[1]
+ vmlal.u32 $D4,$H2#hi,${R2}[1]
+ vmlal.u32 $D1,$H4#hi,${S2}[1]
+ vmlal.u32 $D2,$H0#hi,${R2}[1]
+
+ vmlal.u32 $D3,$H0#hi,${R3}[1]
+ vmlal.u32 $D0,$H2#hi,${S3}[1]
+ vmlal.u32 $D4,$H1#hi,${R3}[1]
+ vmlal.u32 $D1,$H3#hi,${S3}[1]
+ vmlal.u32 $D2,$H4#hi,${S3}[1]
+
+ vmlal.u32 $D3,$H4#hi,${S4}[1]
+ vmlal.u32 $D0,$H1#hi,${S4}[1]
+ vmlal.u32 $D4,$H0#hi,${R4}[1]
+ vmlal.u32 $D1,$H2#hi,${S4}[1]
+ vmlal.u32 $D2,$H3#hi,${S4}[1]
+
+ vld4.32 {$H0#hi,$H1#hi,$H2#hi,$H3#hi},[$in2] @ inp[2:3] (or 0)
+ add $in2,$in2,#64
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ (hash+inp[0:1])*r^4 and accumulate
+
+ vmlal.u32 $D3,$H3#lo,${R0}[0]
+ vmlal.u32 $D0,$H0#lo,${R0}[0]
+ vmlal.u32 $D4,$H4#lo,${R0}[0]
+ vmlal.u32 $D1,$H1#lo,${R0}[0]
+ vmlal.u32 $D2,$H2#lo,${R0}[0]
+ vld1.32 ${S4}[0],[$tbl0,:32]
+
+ vmlal.u32 $D3,$H2#lo,${R1}[0]
+ vmlal.u32 $D0,$H4#lo,${S1}[0]
+ vmlal.u32 $D4,$H3#lo,${R1}[0]
+ vmlal.u32 $D1,$H0#lo,${R1}[0]
+ vmlal.u32 $D2,$H1#lo,${R1}[0]
+
+ vmlal.u32 $D3,$H1#lo,${R2}[0]
+ vmlal.u32 $D0,$H3#lo,${S2}[0]
+ vmlal.u32 $D4,$H2#lo,${R2}[0]
+ vmlal.u32 $D1,$H4#lo,${S2}[0]
+ vmlal.u32 $D2,$H0#lo,${R2}[0]
+
+ vmlal.u32 $D3,$H0#lo,${R3}[0]
+ vmlal.u32 $D0,$H2#lo,${S3}[0]
+ vmlal.u32 $D4,$H1#lo,${R3}[0]
+ vmlal.u32 $D1,$H3#lo,${S3}[0]
+ vmlal.u32 $D3,$H4#lo,${S4}[0]
+
+ vmlal.u32 $D2,$H4#lo,${S3}[0]
+ vmlal.u32 $D0,$H1#lo,${S4}[0]
+ vmlal.u32 $D4,$H0#lo,${R4}[0]
+ vmov.i32 $H4,#1<<24 @ padbit, yes, always
+ vmlal.u32 $D1,$H2#lo,${S4}[0]
+ vmlal.u32 $D2,$H3#lo,${S4}[0]
+
+ vld4.32 {$H0#lo,$H1#lo,$H2#lo,$H3#lo},[$inp] @ inp[0:1]
+ add $inp,$inp,#64
+# ifdef __ARMEB__
+ vrev32.8 $H0,$H0
+ vrev32.8 $H1,$H1
+ vrev32.8 $H2,$H2
+ vrev32.8 $H3,$H3
+# endif
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ lazy reduction interleaved with base 2^32 -> base 2^26 of
+ @ inp[0:3] previously loaded to $H0-$H3 and smashed to $H0-$H4.
+
+ vshr.u64 $T0,$D3,#26
+ vmovn.i64 $D3#lo,$D3
+ vshr.u64 $T1,$D0,#26
+ vmovn.i64 $D0#lo,$D0
+ vadd.i64 $D4,$D4,$T0 @ h3 -> h4
+ vbic.i32 $D3#lo,#0xfc000000
+ vsri.u32 $H4,$H3,#8 @ base 2^32 -> base 2^26
+ vadd.i64 $D1,$D1,$T1 @ h0 -> h1
+ vshl.u32 $H3,$H3,#18
+ vbic.i32 $D0#lo,#0xfc000000
+
+ vshrn.u64 $T0#lo,$D4,#26
+ vmovn.i64 $D4#lo,$D4
+ vshr.u64 $T1,$D1,#26
+ vmovn.i64 $D1#lo,$D1
+ vadd.i64 $D2,$D2,$T1 @ h1 -> h2
+ vsri.u32 $H3,$H2,#14
+ vbic.i32 $D4#lo,#0xfc000000
+ vshl.u32 $H2,$H2,#12
+ vbic.i32 $D1#lo,#0xfc000000
+
+ vadd.i32 $D0#lo,$D0#lo,$T0#lo
+ vshl.u32 $T0#lo,$T0#lo,#2
+ vbic.i32 $H3,#0xfc000000
+ vshrn.u64 $T1#lo,$D2,#26
+ vmovn.i64 $D2#lo,$D2
+ vaddl.u32 $D0,$D0#lo,$T0#lo @ h4 -> h0 [widen for a sec]
+ vsri.u32 $H2,$H1,#20
+ vadd.i32 $D3#lo,$D3#lo,$T1#lo @ h2 -> h3
+ vshl.u32 $H1,$H1,#6
+ vbic.i32 $D2#lo,#0xfc000000
+ vbic.i32 $H2,#0xfc000000
+
+ vshrn.u64 $T0#lo,$D0,#26 @ re-narrow
+ vmovn.i64 $D0#lo,$D0
+ vsri.u32 $H1,$H0,#26
+ vbic.i32 $H0,#0xfc000000
+ vshr.u32 $T1#lo,$D3#lo,#26
+ vbic.i32 $D3#lo,#0xfc000000
+ vbic.i32 $D0#lo,#0xfc000000
+ vadd.i32 $D1#lo,$D1#lo,$T0#lo @ h0 -> h1
+ vadd.i32 $D4#lo,$D4#lo,$T1#lo @ h3 -> h4
+ vbic.i32 $H1,#0xfc000000
+
+ bhi .Loop_neon
+
+.Lskip_loop:
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ multiply (inp[0:1]+hash) or inp[2:3] by r^2:r^1
+
+ add $tbl1,$ctx,#(48+0*9*4)
+ add $tbl0,$ctx,#(48+1*9*4)
+ adds $len,$len,#32
+ it ne
+ movne $len,#0
+ bne .Long_tail
+
+ vadd.i32 $H2#hi,$H2#lo,$D2#lo @ add hash value and move to #hi
+ vadd.i32 $H0#hi,$H0#lo,$D0#lo
+ vadd.i32 $H3#hi,$H3#lo,$D3#lo
+ vadd.i32 $H1#hi,$H1#lo,$D1#lo
+ vadd.i32 $H4#hi,$H4#lo,$D4#lo
+
+.Long_tail:
+ vld4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]! @ load r^1
+ vld4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]! @ load r^2
+
+ vadd.i32 $H2#lo,$H2#lo,$D2#lo @ can be redundant
+ vmull.u32 $D2,$H2#hi,$R0
+ vadd.i32 $H0#lo,$H0#lo,$D0#lo
+ vmull.u32 $D0,$H0#hi,$R0
+ vadd.i32 $H3#lo,$H3#lo,$D3#lo
+ vmull.u32 $D3,$H3#hi,$R0
+ vadd.i32 $H1#lo,$H1#lo,$D1#lo
+ vmull.u32 $D1,$H1#hi,$R0
+ vadd.i32 $H4#lo,$H4#lo,$D4#lo
+ vmull.u32 $D4,$H4#hi,$R0
+
+ vmlal.u32 $D0,$H4#hi,$S1
+ vld4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
+ vmlal.u32 $D3,$H2#hi,$R1
+ vld4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
+ vmlal.u32 $D1,$H0#hi,$R1
+ vmlal.u32 $D4,$H3#hi,$R1
+ vmlal.u32 $D2,$H1#hi,$R1
+
+ vmlal.u32 $D3,$H1#hi,$R2
+ vld1.32 ${S4}[1],[$tbl1,:32]
+ vmlal.u32 $D0,$H3#hi,$S2
+ vld1.32 ${S4}[0],[$tbl0,:32]
+ vmlal.u32 $D4,$H2#hi,$R2
+ vmlal.u32 $D1,$H4#hi,$S2
+ vmlal.u32 $D2,$H0#hi,$R2
+
+ vmlal.u32 $D3,$H0#hi,$R3
+ it ne
+ addne $tbl1,$ctx,#(48+2*9*4)
+ vmlal.u32 $D0,$H2#hi,$S3
+ it ne
+ addne $tbl0,$ctx,#(48+3*9*4)
+ vmlal.u32 $D4,$H1#hi,$R3
+ vmlal.u32 $D1,$H3#hi,$S3
+ vmlal.u32 $D2,$H4#hi,$S3
+
+ vmlal.u32 $D3,$H4#hi,$S4
+ vorn $MASK,$MASK,$MASK @ all-ones, can be redundant
+ vmlal.u32 $D0,$H1#hi,$S4
+ vshr.u64 $MASK,$MASK,#38
+ vmlal.u32 $D4,$H0#hi,$R4
+ vmlal.u32 $D1,$H2#hi,$S4
+ vmlal.u32 $D2,$H3#hi,$S4
+
+ beq .Lshort_tail
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ (hash+inp[0:1])*r^4:r^3 and accumulate
+
+ vld4.32 {${R0}[1],${R1}[1],${S1}[1],${R2}[1]},[$tbl1]! @ load r^3
+ vld4.32 {${R0}[0],${R1}[0],${S1}[0],${R2}[0]},[$tbl0]! @ load r^4
+
+ vmlal.u32 $D2,$H2#lo,$R0
+ vmlal.u32 $D0,$H0#lo,$R0
+ vmlal.u32 $D3,$H3#lo,$R0
+ vmlal.u32 $D1,$H1#lo,$R0
+ vmlal.u32 $D4,$H4#lo,$R0
+
+ vmlal.u32 $D0,$H4#lo,$S1
+ vld4.32 {${S2}[1],${R3}[1],${S3}[1],${R4}[1]},[$tbl1]!
+ vmlal.u32 $D3,$H2#lo,$R1
+ vld4.32 {${S2}[0],${R3}[0],${S3}[0],${R4}[0]},[$tbl0]!
+ vmlal.u32 $D1,$H0#lo,$R1
+ vmlal.u32 $D4,$H3#lo,$R1
+ vmlal.u32 $D2,$H1#lo,$R1
+
+ vmlal.u32 $D3,$H1#lo,$R2
+ vld1.32 ${S4}[1],[$tbl1,:32]
+ vmlal.u32 $D0,$H3#lo,$S2
+ vld1.32 ${S4}[0],[$tbl0,:32]
+ vmlal.u32 $D4,$H2#lo,$R2
+ vmlal.u32 $D1,$H4#lo,$S2
+ vmlal.u32 $D2,$H0#lo,$R2
+
+ vmlal.u32 $D3,$H0#lo,$R3
+ vmlal.u32 $D0,$H2#lo,$S3
+ vmlal.u32 $D4,$H1#lo,$R3
+ vmlal.u32 $D1,$H3#lo,$S3
+ vmlal.u32 $D2,$H4#lo,$S3
+
+ vmlal.u32 $D3,$H4#lo,$S4
+ vorn $MASK,$MASK,$MASK @ all-ones
+ vmlal.u32 $D0,$H1#lo,$S4
+ vshr.u64 $MASK,$MASK,#38
+ vmlal.u32 $D4,$H0#lo,$R4
+ vmlal.u32 $D1,$H2#lo,$S4
+ vmlal.u32 $D2,$H3#lo,$S4
+
+.Lshort_tail:
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ horizontal addition
+
+ vadd.i64 $D3#lo,$D3#lo,$D3#hi
+ vadd.i64 $D0#lo,$D0#lo,$D0#hi
+ vadd.i64 $D4#lo,$D4#lo,$D4#hi
+ vadd.i64 $D1#lo,$D1#lo,$D1#hi
+ vadd.i64 $D2#lo,$D2#lo,$D2#hi
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ lazy reduction, but without narrowing
+
+ vshr.u64 $T0,$D3,#26
+ vand.i64 $D3,$D3,$MASK
+ vshr.u64 $T1,$D0,#26
+ vand.i64 $D0,$D0,$MASK
+ vadd.i64 $D4,$D4,$T0 @ h3 -> h4
+ vadd.i64 $D1,$D1,$T1 @ h0 -> h1
+
+ vshr.u64 $T0,$D4,#26
+ vand.i64 $D4,$D4,$MASK
+ vshr.u64 $T1,$D1,#26
+ vand.i64 $D1,$D1,$MASK
+ vadd.i64 $D2,$D2,$T1 @ h1 -> h2
+
+ vadd.i64 $D0,$D0,$T0
+ vshl.u64 $T0,$T0,#2
+ vshr.u64 $T1,$D2,#26
+ vand.i64 $D2,$D2,$MASK
+ vadd.i64 $D0,$D0,$T0 @ h4 -> h0
+ vadd.i64 $D3,$D3,$T1 @ h2 -> h3
+
+ vshr.u64 $T0,$D0,#26
+ vand.i64 $D0,$D0,$MASK
+ vshr.u64 $T1,$D3,#26
+ vand.i64 $D3,$D3,$MASK
+ vadd.i64 $D1,$D1,$T0 @ h0 -> h1
+ vadd.i64 $D4,$D4,$T1 @ h3 -> h4
+
+ cmp $len,#0
+ bne .Leven
+
+ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+ @ store hash value
+
+ vst4.32 {$D0#lo[0],$D1#lo[0],$D2#lo[0],$D3#lo[0]},[$ctx]!
+ vst1.32 {$D4#lo[0]},[$ctx]
+
+ vldmia sp!,{d8-d15} @ epilogue
+ ldmia sp!,{r4-r7}
+ ret @ bx lr
+.size poly1305_blocks_neon,.-poly1305_blocks_neon
+
+.align 5
+.Lzeros:
+.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+#ifndef __KERNEL__
+.LOPENSSL_armcap:
+# ifdef _WIN32
+.word OPENSSL_armcap_P
+# else
+.word OPENSSL_armcap_P-.Lpoly1305_init
+# endif
+.comm OPENSSL_armcap_P,4,4
+.hidden OPENSSL_armcap_P
+#endif
+#endif
+___
+} }
+$code.=<<___;
+.asciz "Poly1305 for ARMv4/NEON, CRYPTOGAMS by \@dot-asm"
+.align 2
+___
+
+foreach (split("\n",$code)) {
+ s/\`([^\`]*)\`/eval $1/geo;
+
+ s/\bq([0-9]+)#(lo|hi)/sprintf "d%d",2*$1+($2 eq "hi")/geo or
+ s/\bret\b/bx lr/go or
+ s/\bbx\s+lr\b/.word\t0xe12fff1e/go; # make it possible to compile with -march=armv4
+
+ print $_,"\n";
+}
+close STDOUT; # enforce flush
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 10:24:12 +0000