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galois_arm64.s
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galois_arm64.s
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//+build !noasm !appengine !gccgo
// Copyright 2015, Klaus Post, see LICENSE for details.
// Copyright 2017, Minio, Inc.
#define LOAD(LO1, LO2, HI1, HI2) \
VLD1.P 32(R1), [LO1.B16, LO2.B16] \
\
\ // Get low input and high input
VUSHR $4, LO1.B16, HI1.B16 \
VUSHR $4, LO2.B16, HI2.B16 \
VAND V8.B16, LO1.B16, LO1.B16 \
VAND V8.B16, LO2.B16, LO2.B16
#define GALOIS_MUL(MUL_LO, MUL_HI, OUT1, OUT2, TMP1, TMP2) \
\ // Mul low part and mul high part
VTBL V0.B16, [MUL_LO.B16], OUT1.B16 \
VTBL V10.B16, [MUL_HI.B16], OUT2.B16 \
VTBL V1.B16, [MUL_LO.B16], TMP1.B16 \
VTBL V11.B16, [MUL_HI.B16], TMP2.B16 \
\
\ // Combine results
VEOR OUT2.B16, OUT1.B16, OUT1.B16 \
VEOR TMP2.B16, TMP1.B16, OUT2.B16
// func galMulNEON(low, high, in, out []byte)
TEXT ·galMulNEON(SB), 7, $0
MOVD in_base+48(FP), R1
MOVD in_len+56(FP), R2 // length of message
MOVD out_base+72(FP), R5
SUBS $32, R2
BMI complete
MOVD low+0(FP), R10 // R10: &low
MOVD high+24(FP), R11 // R11: &high
VLD1 (R10), [V6.B16]
VLD1 (R11), [V7.B16]
//
// Use an extra instruction below since `VDUP R3, V8.B16` generates assembler error
// WORD $0x4e010c68 // dup v8.16b, w3
//
MOVD $0x0f, R3
VMOV R3, V8.B[0]
VDUP V8.B[0], V8.B16
loop:
// Main loop
LOAD(V0, V1, V10, V11)
GALOIS_MUL(V6, V7, V4, V5, V14, V15)
// Store result
VST1.P [V4.D2, V5.D2], 32(R5)
SUBS $32, R2
BPL loop
complete:
RET
// func galMulXorNEON(low, high, in, out []byte)
TEXT ·galMulXorNEON(SB), 7, $0
MOVD in_base+48(FP), R1
MOVD in_len+56(FP), R2 // length of message
MOVD out_base+72(FP), R5
SUBS $32, R2
BMI completeXor
MOVD low+0(FP), R10 // R10: &low
MOVD high+24(FP), R11 // R11: &high
VLD1 (R10), [V6.B16]
VLD1 (R11), [V7.B16]
//
// Use an extra instruction below since `VDUP R3, V8.B16` generates assembler error
// WORD $0x4e010c68 // dup v8.16b, w3
//
MOVD $0x0f, R3
VMOV R3, V8.B[0]
VDUP V8.B[0], V8.B16
loopXor:
// Main loop
VLD1 (R5), [V20.B16, V21.B16]
LOAD(V0, V1, V10, V11)
GALOIS_MUL(V6, V7, V4, V5, V14, V15)
VEOR V20.B16, V4.B16, V4.B16
VEOR V21.B16, V5.B16, V5.B16
// Store result
VST1.P [V4.D2, V5.D2], 32(R5)
SUBS $32, R2
BPL loopXor
completeXor:
RET
// func galXorNEON(in, out []byte)
TEXT ·galXorNEON(SB), 7, $0
MOVD in_base+0(FP), R1
MOVD in_len+8(FP), R2 // length of message
MOVD out_base+24(FP), R5
SUBS $32, R2
BMI completeXor
loopXor:
// Main loop
VLD1.P 32(R1), [V0.B16, V1.B16]
VLD1 (R5), [V20.B16, V21.B16]
VEOR V20.B16, V0.B16, V4.B16
VEOR V21.B16, V1.B16, V5.B16
// Store result
VST1.P [V4.D2, V5.D2], 32(R5)
SUBS $32, R2
BPL loopXor
completeXor:
RET