1 files changed, 89 insertions, 0 deletions
diff --git a/vendor/github.com/templexxx/xorsimd/xor.go b/vendor/github.com/templexxx/xorsimd/xor.go
new file mode 100644
index 0000000..ae88911
--- /dev/null
+++ b/vendor/github.com/templexxx/xorsimd/xor.go
@@ -0,0 +1,89 @@
+// Copyright (c) 2019. Temple3x (temple3x@gmail.com)
+//
+// Use of this source code is governed by the MIT License
+// that can be found in the LICENSE file.
+
+package xorsimd
+
+import "github.com/templexxx/cpu"
+
+// EnableAVX512 may slow down CPU Clock (maybe not).
+// TODO need more research:
+// https://lemire.me/blog/2018/04/19/by-how-much-does-avx-512-slow-down-your-cpu-a-first-experiment/
+var EnableAVX512 = true
+
+// cpuFeature indicates which instruction set will be used.
+var cpuFeature = getCPUFeature()
+
+const (
+	avx512 = iota
+	avx2
+	sse2
+	generic
+)
+
+// TODO: Add ARM feature...
+func getCPUFeature() int {
+	if hasAVX512() && EnableAVX512 {
+		return avx512
+	} else if cpu.X86.HasAVX2 {
+		return avx2
+	} else {
+		return sse2 // amd64 must has sse2
+	}
+}
+
+func hasAVX512() (ok bool) {
+
+	return cpu.X86.HasAVX512VL &&
+		cpu.X86.HasAVX512BW &&
+		cpu.X86.HasAVX512F &&
+		cpu.X86.HasAVX512DQ
+}
+
+// Encode encodes elements from source slice into a
+// destination slice. The source and destination may overlap.
+// Encode returns the number of bytes encoded, which will be the minimum of
+// len(src[i]) and len(dst).
+func Encode(dst []byte, src [][]byte) (n int) {
+	n = checkLen(dst, src)
+	if n == 0 {
+		return
+	}
+
+	dst = dst[:n]
+	for i := range src {
+		src[i] = src[i][:n]
+	}
+
+	if len(src) == 1 {
+		copy(dst, src[0])
+		return
+	}
+
+	encode(dst, src)
+	return
+}
+
+func checkLen(dst []byte, src [][]byte) int {
+	n := len(dst)
+	for i := range src {
+		if len(src[i]) < n {
+			n = len(src[i])
+		}
+	}
+
+	if n <= 0 {
+		return 0
+	}
+	return n
+}
+
+// Bytes XORs the bytes in a and b into a
+// destination slice. The source and destination may overlap.
+//
+// Bytes returns the number of bytes encoded, which will be the minimum of
+// len(dst), len(a), len(b).
+func Bytes(dst, a, b []byte) int {
+	return Encode(dst, [][]byte{a, b})
+}