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184 lines
3.3 KiB
ArmAsm
184 lines
3.3 KiB
ArmAsm
//go:build !appengine && gc && !purego
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// +build !appengine
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// +build gc
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// +build !purego
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#include "textflag.h"
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// Registers:
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#define digest R1
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#define h R2 // return value
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#define p R3 // input pointer
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#define n R4 // input length
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#define nblocks R5 // n / 32
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#define prime1 R7
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#define prime2 R8
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#define prime3 R9
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#define prime4 R10
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#define prime5 R11
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#define v1 R12
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#define v2 R13
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#define v3 R14
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#define v4 R15
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#define x1 R20
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#define x2 R21
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#define x3 R22
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#define x4 R23
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#define round(acc, x) \
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MADD prime2, acc, x, acc \
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ROR $64-31, acc \
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MUL prime1, acc
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// round0 performs the operation x = round(0, x).
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#define round0(x) \
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MUL prime2, x \
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ROR $64-31, x \
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MUL prime1, x
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#define mergeRound(acc, x) \
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round0(x) \
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EOR x, acc \
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MADD acc, prime4, prime1, acc
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// blockLoop processes as many 32-byte blocks as possible,
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// updating v1, v2, v3, and v4. It assumes that n >= 32.
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#define blockLoop() \
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LSR $5, n, nblocks \
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PCALIGN $16 \
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loop: \
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LDP.P 16(p), (x1, x2) \
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LDP.P 16(p), (x3, x4) \
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round(v1, x1) \
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round(v2, x2) \
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round(v3, x3) \
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round(v4, x4) \
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SUB $1, nblocks \
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CBNZ nblocks, loop
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// func Sum64(b []byte) uint64
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TEXT ·Sum64(SB), NOSPLIT|NOFRAME, $0-32
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LDP b_base+0(FP), (p, n)
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LDP ·primes+0(SB), (prime1, prime2)
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LDP ·primes+16(SB), (prime3, prime4)
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MOVD ·primes+32(SB), prime5
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CMP $32, n
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CSEL LT, prime5, ZR, h // if n < 32 { h = prime5 } else { h = 0 }
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BLT afterLoop
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ADD prime1, prime2, v1
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MOVD prime2, v2
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MOVD $0, v3
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NEG prime1, v4
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blockLoop()
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ROR $64-1, v1, x1
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ROR $64-7, v2, x2
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ADD x1, x2
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ROR $64-12, v3, x3
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ROR $64-18, v4, x4
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ADD x3, x4
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ADD x2, x4, h
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mergeRound(h, v1)
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mergeRound(h, v2)
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mergeRound(h, v3)
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mergeRound(h, v4)
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afterLoop:
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ADD n, h
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TBZ $4, n, try8
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LDP.P 16(p), (x1, x2)
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round0(x1)
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// NOTE: here and below, sequencing the EOR after the ROR (using a
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// rotated register) is worth a small but measurable speedup for small
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// inputs.
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ROR $64-27, h
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EOR x1 @> 64-27, h, h
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MADD h, prime4, prime1, h
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round0(x2)
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ROR $64-27, h
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EOR x2 @> 64-27, h, h
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MADD h, prime4, prime1, h
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try8:
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TBZ $3, n, try4
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MOVD.P 8(p), x1
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round0(x1)
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ROR $64-27, h
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EOR x1 @> 64-27, h, h
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MADD h, prime4, prime1, h
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try4:
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TBZ $2, n, try2
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MOVWU.P 4(p), x2
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MUL prime1, x2
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ROR $64-23, h
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EOR x2 @> 64-23, h, h
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MADD h, prime3, prime2, h
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try2:
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TBZ $1, n, try1
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MOVHU.P 2(p), x3
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AND $255, x3, x1
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LSR $8, x3, x2
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MUL prime5, x1
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ROR $64-11, h
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EOR x1 @> 64-11, h, h
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MUL prime1, h
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MUL prime5, x2
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ROR $64-11, h
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EOR x2 @> 64-11, h, h
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MUL prime1, h
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try1:
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TBZ $0, n, finalize
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MOVBU (p), x4
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MUL prime5, x4
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ROR $64-11, h
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EOR x4 @> 64-11, h, h
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MUL prime1, h
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finalize:
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EOR h >> 33, h
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MUL prime2, h
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EOR h >> 29, h
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MUL prime3, h
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EOR h >> 32, h
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MOVD h, ret+24(FP)
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RET
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// func writeBlocks(d *Digest, b []byte) int
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TEXT ·writeBlocks(SB), NOSPLIT|NOFRAME, $0-40
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LDP ·primes+0(SB), (prime1, prime2)
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// Load state. Assume v[1-4] are stored contiguously.
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MOVD d+0(FP), digest
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LDP 0(digest), (v1, v2)
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LDP 16(digest), (v3, v4)
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LDP b_base+8(FP), (p, n)
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blockLoop()
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// Store updated state.
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STP (v1, v2), 0(digest)
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STP (v3, v4), 16(digest)
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BIC $31, n
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MOVD n, ret+32(FP)
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RET
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