tzhash/gf127/gf127_amd64.go

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//go:build amd64 && !generic
// +build amd64,!generic
// Package gf127 implements the GF(2^127) arithmetic
// modulo reduction polynomial x^127 + x^63 + 1 .
// This is rather straight-forward re-implementation of C library
// available here https://github.com/srijs/hwsl2-core .
// Interfaces are highly influenced by math/big .
package gf127
import "golang.org/x/sys/cpu"
// x127x63 represents x^127 + x^63
var x127x63 = GF127{msb64, msb64} //nolint:deadcode,varcheck
// Add sets c to a+b.
func Add(a, b, c *GF127) {
if cpu.X86.HasAVX {
addAVX(a, b, c)
} else {
addGeneric(a, b, c)
}
}
// Mul sets c to a*b.
func Mul(a, b, c *GF127) {
if cpu.X86.HasAVX {
mulAVX(a, b, c)
} else {
mulGeneric(a, b, c)
}
}
// Mul10 sets b to a*x.
func Mul10(a, b *GF127) {
if cpu.X86.HasAVX {
mul10AVX(a, b)
} else {
mul10Generic(a, b)
}
}
// Mul11 sets b to a*(x+1).
func Mul11(a, b *GF127) {
if cpu.X86.HasAVX {
mul11AVX(a, b)
} else {
mul11Generic(a, b)
}
}
func addAVX(a, b, c *GF127)
func mulAVX(a, b, c *GF127)
func mul10AVX(a, b *GF127)
func mul11AVX(a, b *GF127)