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Remove fnvHash16AVX2 to fix ARM compilation (#833)

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* Remove fnvHash16AVX2 to fix ARM compilation

* useAVX2 is now unnecessary
This commit is contained in:
Andrew Ashikhmin 2020-07-30 17:32:02 +02:00 committed by GitHub
parent fa14c488cc
commit f7b9846740
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 1 additions and 44 deletions
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14
consensus/ethash/algorithm.go
View File

@ -32,7 +32,6 @@ import (
"github.com/ledgerwatch/turbo-geth/crypto"
"github.com/ledgerwatch/turbo-geth/log"
"golang.org/x/crypto/sha3"
"golang.org/x/sys/cpu"
)
const (
@ -230,17 +229,6 @@ func fnvHash(mix []uint32, data []uint32) {
}
}
var useAVX2 = runtime.GOARCH == "amd64" && cpu.X86.HasAVX2
// fnvHash16 is a specialized version of fnvHash for 16 elements.
func fnvHash16(mix []uint32, data []uint32) {
if useAVX2 {
fnvHash16AVX2(&mix[0], &data[0], 0x01000193)
} else {
fnvHash(mix, data)
}
}
// generateDatasetItem combines data from 256 pseudorandomly selected cache nodes,
// and hashes that to compute a single dataset node.
func generateDatasetItem(cache []uint32, index uint32, keccak512 hasher) []byte {
@ -264,7 +252,7 @@ func generateDatasetItem(cache []uint32, index uint32, keccak512 hasher) []byte
// fnv it with a lot of random cache nodes based on index
for i := uint32(0); i < datasetParents; i++ {
parent := fnv(index^i, intMix[i%16]) % rows
fnvHash16(intMix, cache[parent*hashWords:])
fnvHash(intMix, cache[parent*hashWords:])
}
// Flatten the uint32 mix into a binary one and return
for i, val := range intMix {

10
consensus/ethash/fnv_hash16_avx2.go
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@ -1,10 +0,0 @@
package ethash
//go:noescape
func fnvHash16AVX2(data, mix *uint32, prime uint32)
/*
for i := 0; i < 16; i++ {
data[i] = data[i] * prime ^ mix[i]
}
*/

21
consensus/ethash/fnv_hash16_avx2.s
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@ -1,21 +0,0 @@
#include "textflag.h"
// func fnvHash16AVX2(data, mix *uint32, prime uint32)
TEXT ·fnvHash16AVX2(SB), NOSPLIT, $0
MOVQ data+0(FP), AX
MOVQ mix+8(FP), BX
MOVL prime+16(FP), X0
VPBROADCASTD X0, Y0
VPMULLD (AX), Y0, Y1
VPXOR (BX), Y1, Y1
VMOVDQU Y1, (AX)
VPMULLD 32(AX), Y0, Y0
VPXOR 32(BX), Y0, Y0
VMOVDQU Y0, 32(AX)
VZEROUPPER
RET