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