实现基础web服务器

vendor/github.com/chenzhuoyu/base64x/cpuid.go

@@ -0,0 +1,17 @@
+package base64x
+
+import (
+    `fmt`
+    `os`
+
+    `github.com/klauspost/cpuid/v2`
+)
+
+func hasAVX2() bool {
+    switch v := os.Getenv("B64X_MODE"); v {
+        case ""       : fallthrough
+        case "auto"   : return cpuid.CPU.Has(cpuid.AVX2)
+        case "noavx2" : return false
+        default       : panic(fmt.Sprintf("invalid mode: '%s', should be one of 'auto', 'noavx2'", v))
+    }
+}