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//+build !noasm !appengine !gccgo
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// Copyright 2015, Klaus Post, see LICENSE for details.
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// Copyright 2017, Minio, Inc.
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// Use github.com/minio/asm2plan9s on this file to assemble ARM instructions to
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// the opcodes of their Plan9 equivalents
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// polynomial multiplication
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#define POLYNOMIAL_MULTIPLICATION \
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WORD $0x0e3ce340 \ // pmull v0.8h,v26.8b,v28.8b
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WORD $0x4e3ce346 \ // pmull2 v6.8h,v26.16b,v28.16b
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WORD $0x0e3ce36c \ // pmull v12.8h,v27.8b,v28.8b
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WORD $0x4e3ce372 // pmull2 v18.8h,v27.16b,v28.16b
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// first reduction
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#define FIRST_REDUCTION \
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WORD $0x0f088402 \ // shrn v2.8b, v0.8h, #8
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WORD $0x0f0884c8 \ // shrn v8.8b, v6.8h, #8
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WORD $0x0f08858e \ // shrn v14.8b, v12.8h, #8
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WORD $0x0f088654 \ // shrn v20.8b, v18.8h, #8
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WORD $0x0e22e3c3 \ // pmull v3.8h,v30.8b,v2.8b
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WORD $0x0e28e3c9 \ // pmull v9.8h,v30.8b,v8.8b
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WORD $0x0e2ee3cf \ // pmull v15.8h,v30.8b,v14.8b
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WORD $0x0e34e3d5 \ // pmull v21.8h,v30.8b,v20.8b
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WORD $0x6e201c60 \ // eor v0.16b,v3.16b,v0.16b
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WORD $0x6e261d26 \ // eor v6.16b,v9.16b,v6.16b
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WORD $0x6e2c1dec \ // eor v12.16b,v15.16b,v12.16b
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WORD $0x6e321eb2 // eor v18.16b,v21.16b,v18.16b
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// second reduction
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#define SECOND_REDUCTION \
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WORD $0x0f088404 \ // shrn v4.8b, v0.8h, #8
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WORD $0x0f0884ca \ // shrn v10.8b, v6.8h, #8
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WORD $0x0f088590 \ // shrn v16.8b, v12.8h, #8
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WORD $0x0f088656 \ // shrn v22.8b, v18.8h, #8
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WORD $0x6e241c44 \ // eor v4.16b,v2.16b,v4.16b
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WORD $0x6e2a1d0a \ // eor v10.16b,v8.16b,v10.16b
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WORD $0x6e301dd0 \ // eor v16.16b,v14.16b,v16.16b
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WORD $0x6e361e96 \ // eor v22.16b,v20.16b,v22.16b
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WORD $0x0e24e3c5 \ // pmull v5.8h,v30.8b,v4.8b
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WORD $0x0e2ae3cb \ // pmull v11.8h,v30.8b,v10.8b
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WORD $0x0e30e3d1 \ // pmull v17.8h,v30.8b,v16.8b
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WORD $0x0e36e3d7 \ // pmull v23.8h,v30.8b,v22.8b
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WORD $0x6e201ca0 \ // eor v0.16b,v5.16b,v0.16b
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WORD $0x6e261d61 \ // eor v1.16b,v11.16b,v6.16b
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WORD $0x6e2c1e22 \ // eor v2.16b,v17.16b,v12.16b
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WORD $0x6e321ee3 // eor v3.16b,v23.16b,v18.16b
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// func galMulNEON(c uint64, in, out []byte)
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TEXT ·galMulNEON(SB), 7, $0
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MOVD c+0(FP), R0
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MOVD in_base+8(FP), R1
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MOVD in_len+16(FP), R2 // length of message
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MOVD out_base+32(FP), R5
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SUBS $32, R2
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BMI complete
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// Load constants table pointer
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MOVD $·constants(SB), R3
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// and load constants into v30 & v31
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WORD $0x4c40a07e // ld1 {v30.16b-v31.16b}, [x3]
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WORD $0x4e010c1c // dup v28.16b, w0
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loop:
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// Main loop
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WORD $0x4cdfa83a // ld1 {v26.4s-v27.4s}, [x1], #32
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POLYNOMIAL_MULTIPLICATION
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FIRST_REDUCTION
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SECOND_REDUCTION
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// combine results
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WORD $0x4e1f2000 // tbl v0.16b,{v0.16b,v1.16b},v31.16b
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WORD $0x4e1f2041 // tbl v1.16b,{v2.16b,v3.16b},v31.16b
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// Store result
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WORD $0x4c9faca0 // st1 {v0.2d-v1.2d}, [x5], #32
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SUBS $32, R2
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BPL loop
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complete:
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RET
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// func galMulXorNEON(c uint64, in, out []byte)
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TEXT ·galMulXorNEON(SB), 7, $0
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MOVD c+0(FP), R0
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MOVD in_base+8(FP), R1
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MOVD in_len+16(FP), R2 // length of message
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MOVD out_base+32(FP), R5
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SUBS $32, R2
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BMI completeXor
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// Load constants table pointer
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MOVD $·constants(SB), R3
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// and load constants into v30 & v31
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WORD $0x4c40a07e // ld1 {v30.16b-v31.16b}, [x3]
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WORD $0x4e010c1c // dup v28.16b, w0
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loopXor:
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// Main loop
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WORD $0x4cdfa83a // ld1 {v26.4s-v27.4s}, [x1], #32
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WORD $0x4c40a8b8 // ld1 {v24.4s-v25.4s}, [x5]
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POLYNOMIAL_MULTIPLICATION
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FIRST_REDUCTION
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SECOND_REDUCTION
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// combine results
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WORD $0x4e1f2000 // tbl v0.16b,{v0.16b,v1.16b},v31.16b
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WORD $0x4e1f2041 // tbl v1.16b,{v2.16b,v3.16b},v31.16b
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// Xor result and store
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WORD $0x6e381c00 // eor v0.16b,v0.16b,v24.16b
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WORD $0x6e391c21 // eor v1.16b,v1.16b,v25.16b
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WORD $0x4c9faca0 // st1 {v0.2d-v1.2d}, [x5], #32
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SUBS $32, R2
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BPL loopXor
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completeXor:
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RET
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// Constants table
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// generating polynomial is 29 (= 0x1d)
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DATA ·constants+0x0(SB)/8, $0x1d1d1d1d1d1d1d1d
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DATA ·constants+0x8(SB)/8, $0x1d1d1d1d1d1d1d1d
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// constant for TBL instruction
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DATA ·constants+0x10(SB)/8, $0x0e0c0a0806040200
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DATA ·constants+0x18(SB)/8, $0x1e1c1a1816141210
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GLOBL ·constants(SB), 8, $32
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