--- /dev/null
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.11
+// +build !gccgo,!appengine
+
+#include "textflag.h"
+
+#define NUM_ROUNDS 10
+
+// func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
+TEXT ·xorKeyStreamVX(SB), NOSPLIT, $0
+ MOVD dst+0(FP), R1
+ MOVD src+24(FP), R2
+ MOVD src_len+32(FP), R3
+ MOVD key+48(FP), R4
+ MOVD nonce+56(FP), R6
+ MOVD counter+64(FP), R7
+
+ MOVD $·constants(SB), R10
+ MOVD $·incRotMatrix(SB), R11
+
+ MOVW (R7), R20
+
+ AND $~255, R3, R13
+ ADD R2, R13, R12 // R12 for block end
+ AND $255, R3, R13
+loop:
+ MOVD $NUM_ROUNDS, R21
+ VLD1 (R11), [V30.S4, V31.S4]
+
+ // load contants
+ // VLD4R (R10), [V0.S4, V1.S4, V2.S4, V3.S4]
+ WORD $0x4D60E940
+
+ // load keys
+ // VLD4R 16(R4), [V4.S4, V5.S4, V6.S4, V7.S4]
+ WORD $0x4DFFE884
+ // VLD4R 16(R4), [V8.S4, V9.S4, V10.S4, V11.S4]
+ WORD $0x4DFFE888
+ SUB $32, R4
+
+ // load counter + nonce
+ // VLD1R (R7), [V12.S4]
+ WORD $0x4D40C8EC
+
+ // VLD3R (R6), [V13.S4, V14.S4, V15.S4]
+ WORD $0x4D40E8CD
+
+ // update counter
+ VADD V30.S4, V12.S4, V12.S4
+
+chacha:
+ // V0..V3 += V4..V7
+ // V12..V15 <<<= ((V12..V15 XOR V0..V3), 16)
+ VADD V0.S4, V4.S4, V0.S4
+ VADD V1.S4, V5.S4, V1.S4
+ VADD V2.S4, V6.S4, V2.S4
+ VADD V3.S4, V7.S4, V3.S4
+ VEOR V12.B16, V0.B16, V12.B16
+ VEOR V13.B16, V1.B16, V13.B16
+ VEOR V14.B16, V2.B16, V14.B16
+ VEOR V15.B16, V3.B16, V15.B16
+ VREV32 V12.H8, V12.H8
+ VREV32 V13.H8, V13.H8
+ VREV32 V14.H8, V14.H8
+ VREV32 V15.H8, V15.H8
+ // V8..V11 += V12..V15
+ // V4..V7 <<<= ((V4..V7 XOR V8..V11), 12)
+ VADD V8.S4, V12.S4, V8.S4
+ VADD V9.S4, V13.S4, V9.S4
+ VADD V10.S4, V14.S4, V10.S4
+ VADD V11.S4, V15.S4, V11.S4
+ VEOR V8.B16, V4.B16, V16.B16
+ VEOR V9.B16, V5.B16, V17.B16
+ VEOR V10.B16, V6.B16, V18.B16
+ VEOR V11.B16, V7.B16, V19.B16
+ VSHL $12, V16.S4, V4.S4
+ VSHL $12, V17.S4, V5.S4
+ VSHL $12, V18.S4, V6.S4
+ VSHL $12, V19.S4, V7.S4
+ VSRI $20, V16.S4, V4.S4
+ VSRI $20, V17.S4, V5.S4
+ VSRI $20, V18.S4, V6.S4
+ VSRI $20, V19.S4, V7.S4
+
+ // V0..V3 += V4..V7
+ // V12..V15 <<<= ((V12..V15 XOR V0..V3), 8)
+ VADD V0.S4, V4.S4, V0.S4
+ VADD V1.S4, V5.S4, V1.S4
+ VADD V2.S4, V6.S4, V2.S4
+ VADD V3.S4, V7.S4, V3.S4
+ VEOR V12.B16, V0.B16, V12.B16
+ VEOR V13.B16, V1.B16, V13.B16
+ VEOR V14.B16, V2.B16, V14.B16
+ VEOR V15.B16, V3.B16, V15.B16
+ VTBL V31.B16, [V12.B16], V12.B16
+ VTBL V31.B16, [V13.B16], V13.B16
+ VTBL V31.B16, [V14.B16], V14.B16
+ VTBL V31.B16, [V15.B16], V15.B16
+
+ // V8..V11 += V12..V15
+ // V4..V7 <<<= ((V4..V7 XOR V8..V11), 7)
+ VADD V12.S4, V8.S4, V8.S4
+ VADD V13.S4, V9.S4, V9.S4
+ VADD V14.S4, V10.S4, V10.S4
+ VADD V15.S4, V11.S4, V11.S4
+ VEOR V8.B16, V4.B16, V16.B16
+ VEOR V9.B16, V5.B16, V17.B16
+ VEOR V10.B16, V6.B16, V18.B16
+ VEOR V11.B16, V7.B16, V19.B16
+ VSHL $7, V16.S4, V4.S4
+ VSHL $7, V17.S4, V5.S4
+ VSHL $7, V18.S4, V6.S4
+ VSHL $7, V19.S4, V7.S4
+ VSRI $25, V16.S4, V4.S4
+ VSRI $25, V17.S4, V5.S4
+ VSRI $25, V18.S4, V6.S4
+ VSRI $25, V19.S4, V7.S4
+
+ // V0..V3 += V5..V7, V4
+ // V15,V12-V14 <<<= ((V15,V12-V14 XOR V0..V3), 16)
+ VADD V0.S4, V5.S4, V0.S4
+ VADD V1.S4, V6.S4, V1.S4
+ VADD V2.S4, V7.S4, V2.S4
+ VADD V3.S4, V4.S4, V3.S4
+ VEOR V15.B16, V0.B16, V15.B16
+ VEOR V12.B16, V1.B16, V12.B16
+ VEOR V13.B16, V2.B16, V13.B16
+ VEOR V14.B16, V3.B16, V14.B16
+ VREV32 V12.H8, V12.H8
+ VREV32 V13.H8, V13.H8
+ VREV32 V14.H8, V14.H8
+ VREV32 V15.H8, V15.H8
+
+ // V10 += V15; V5 <<<= ((V10 XOR V5), 12)
+ // ...
+ VADD V15.S4, V10.S4, V10.S4
+ VADD V12.S4, V11.S4, V11.S4
+ VADD V13.S4, V8.S4, V8.S4
+ VADD V14.S4, V9.S4, V9.S4
+ VEOR V10.B16, V5.B16, V16.B16
+ VEOR V11.B16, V6.B16, V17.B16
+ VEOR V8.B16, V7.B16, V18.B16
+ VEOR V9.B16, V4.B16, V19.B16
+ VSHL $12, V16.S4, V5.S4
+ VSHL $12, V17.S4, V6.S4
+ VSHL $12, V18.S4, V7.S4
+ VSHL $12, V19.S4, V4.S4
+ VSRI $20, V16.S4, V5.S4
+ VSRI $20, V17.S4, V6.S4
+ VSRI $20, V18.S4, V7.S4
+ VSRI $20, V19.S4, V4.S4
+
+ // V0 += V5; V15 <<<= ((V0 XOR V15), 8)
+ // ...
+ VADD V5.S4, V0.S4, V0.S4
+ VADD V6.S4, V1.S4, V1.S4
+ VADD V7.S4, V2.S4, V2.S4
+ VADD V4.S4, V3.S4, V3.S4
+ VEOR V0.B16, V15.B16, V15.B16
+ VEOR V1.B16, V12.B16, V12.B16
+ VEOR V2.B16, V13.B16, V13.B16
+ VEOR V3.B16, V14.B16, V14.B16
+ VTBL V31.B16, [V12.B16], V12.B16
+ VTBL V31.B16, [V13.B16], V13.B16
+ VTBL V31.B16, [V14.B16], V14.B16
+ VTBL V31.B16, [V15.B16], V15.B16
+
+ // V10 += V15; V5 <<<= ((V10 XOR V5), 7)
+ // ...
+ VADD V15.S4, V10.S4, V10.S4
+ VADD V12.S4, V11.S4, V11.S4
+ VADD V13.S4, V8.S4, V8.S4
+ VADD V14.S4, V9.S4, V9.S4
+ VEOR V10.B16, V5.B16, V16.B16
+ VEOR V11.B16, V6.B16, V17.B16
+ VEOR V8.B16, V7.B16, V18.B16
+ VEOR V9.B16, V4.B16, V19.B16
+ VSHL $7, V16.S4, V5.S4
+ VSHL $7, V17.S4, V6.S4
+ VSHL $7, V18.S4, V7.S4
+ VSHL $7, V19.S4, V4.S4
+ VSRI $25, V16.S4, V5.S4
+ VSRI $25, V17.S4, V6.S4
+ VSRI $25, V18.S4, V7.S4
+ VSRI $25, V19.S4, V4.S4
+
+ SUB $1, R21
+ CBNZ R21, chacha
+
+ // VLD4R (R10), [V16.S4, V17.S4, V18.S4, V19.S4]
+ WORD $0x4D60E950
+
+ // VLD4R 16(R4), [V20.S4, V21.S4, V22.S4, V23.S4]
+ WORD $0x4DFFE894
+ VADD V30.S4, V12.S4, V12.S4
+ VADD V16.S4, V0.S4, V0.S4
+ VADD V17.S4, V1.S4, V1.S4
+ VADD V18.S4, V2.S4, V2.S4
+ VADD V19.S4, V3.S4, V3.S4
+ // VLD4R 16(R4), [V24.S4, V25.S4, V26.S4, V27.S4]
+ WORD $0x4DFFE898
+ // restore R4
+ SUB $32, R4
+
+ // load counter + nonce
+ // VLD1R (R7), [V28.S4]
+ WORD $0x4D40C8FC
+ // VLD3R (R6), [V29.S4, V30.S4, V31.S4]
+ WORD $0x4D40E8DD
+
+ VADD V20.S4, V4.S4, V4.S4
+ VADD V21.S4, V5.S4, V5.S4
+ VADD V22.S4, V6.S4, V6.S4
+ VADD V23.S4, V7.S4, V7.S4
+ VADD V24.S4, V8.S4, V8.S4
+ VADD V25.S4, V9.S4, V9.S4
+ VADD V26.S4, V10.S4, V10.S4
+ VADD V27.S4, V11.S4, V11.S4
+ VADD V28.S4, V12.S4, V12.S4
+ VADD V29.S4, V13.S4, V13.S4
+ VADD V30.S4, V14.S4, V14.S4
+ VADD V31.S4, V15.S4, V15.S4
+
+ VZIP1 V1.S4, V0.S4, V16.S4
+ VZIP2 V1.S4, V0.S4, V17.S4
+ VZIP1 V3.S4, V2.S4, V18.S4
+ VZIP2 V3.S4, V2.S4, V19.S4
+ VZIP1 V5.S4, V4.S4, V20.S4
+ VZIP2 V5.S4, V4.S4, V21.S4
+ VZIP1 V7.S4, V6.S4, V22.S4
+ VZIP2 V7.S4, V6.S4, V23.S4
+ VZIP1 V9.S4, V8.S4, V24.S4
+ VZIP2 V9.S4, V8.S4, V25.S4
+ VZIP1 V11.S4, V10.S4, V26.S4
+ VZIP2 V11.S4, V10.S4, V27.S4
+ VZIP1 V13.S4, V12.S4, V28.S4
+ VZIP2 V13.S4, V12.S4, V29.S4
+ VZIP1 V15.S4, V14.S4, V30.S4
+ VZIP2 V15.S4, V14.S4, V31.S4
+ VZIP1 V18.D2, V16.D2, V0.D2
+ VZIP2 V18.D2, V16.D2, V4.D2
+ VZIP1 V19.D2, V17.D2, V8.D2
+ VZIP2 V19.D2, V17.D2, V12.D2
+ VLD1.P 64(R2), [V16.B16, V17.B16, V18.B16, V19.B16]
+
+ VZIP1 V22.D2, V20.D2, V1.D2
+ VZIP2 V22.D2, V20.D2, V5.D2
+ VZIP1 V23.D2, V21.D2, V9.D2
+ VZIP2 V23.D2, V21.D2, V13.D2
+ VLD1.P 64(R2), [V20.B16, V21.B16, V22.B16, V23.B16]
+ VZIP1 V26.D2, V24.D2, V2.D2
+ VZIP2 V26.D2, V24.D2, V6.D2
+ VZIP1 V27.D2, V25.D2, V10.D2
+ VZIP2 V27.D2, V25.D2, V14.D2
+ VLD1.P 64(R2), [V24.B16, V25.B16, V26.B16, V27.B16]
+ VZIP1 V30.D2, V28.D2, V3.D2
+ VZIP2 V30.D2, V28.D2, V7.D2
+ VZIP1 V31.D2, V29.D2, V11.D2
+ VZIP2 V31.D2, V29.D2, V15.D2
+ VLD1.P 64(R2), [V28.B16, V29.B16, V30.B16, V31.B16]
+ VEOR V0.B16, V16.B16, V16.B16
+ VEOR V1.B16, V17.B16, V17.B16
+ VEOR V2.B16, V18.B16, V18.B16
+ VEOR V3.B16, V19.B16, V19.B16
+ VST1.P [V16.B16, V17.B16, V18.B16, V19.B16], 64(R1)
+ VEOR V4.B16, V20.B16, V20.B16
+ VEOR V5.B16, V21.B16, V21.B16
+ VEOR V6.B16, V22.B16, V22.B16
+ VEOR V7.B16, V23.B16, V23.B16
+ VST1.P [V20.B16, V21.B16, V22.B16, V23.B16], 64(R1)
+ VEOR V8.B16, V24.B16, V24.B16
+ VEOR V9.B16, V25.B16, V25.B16
+ VEOR V10.B16, V26.B16, V26.B16
+ VEOR V11.B16, V27.B16, V27.B16
+ VST1.P [V24.B16, V25.B16, V26.B16, V27.B16], 64(R1)
+ VEOR V12.B16, V28.B16, V28.B16
+ VEOR V13.B16, V29.B16, V29.B16
+ VEOR V14.B16, V30.B16, V30.B16
+ VEOR V15.B16, V31.B16, V31.B16
+ VST1.P [V28.B16, V29.B16, V30.B16, V31.B16], 64(R1)
+
+ ADD $4, R20
+ MOVW R20, (R7) // update counter
+
+ CMP R2, R12
+ BGT loop
+
+ RET
+
+
+DATA ·constants+0x00(SB)/4, $0x61707865
+DATA ·constants+0x04(SB)/4, $0x3320646e
+DATA ·constants+0x08(SB)/4, $0x79622d32
+DATA ·constants+0x0c(SB)/4, $0x6b206574
+GLOBL ·constants(SB), NOPTR|RODATA, $32
+
+DATA ·incRotMatrix+0x00(SB)/4, $0x00000000
+DATA ·incRotMatrix+0x04(SB)/4, $0x00000001
+DATA ·incRotMatrix+0x08(SB)/4, $0x00000002
+DATA ·incRotMatrix+0x0c(SB)/4, $0x00000003
+DATA ·incRotMatrix+0x10(SB)/4, $0x02010003
+DATA ·incRotMatrix+0x14(SB)/4, $0x06050407
+DATA ·incRotMatrix+0x18(SB)/4, $0x0A09080B
+DATA ·incRotMatrix+0x1c(SB)/4, $0x0E0D0C0F
+GLOBL ·incRotMatrix(SB), NOPTR|RODATA, $32