1 files changed, 44 insertions, 0 deletions
diff --git a/vendor/github.com/twitchyliquid64/golang-asm/obj/x86/ytab.go b/vendor/github.com/twitchyliquid64/golang-asm/obj/x86/ytab.go
new file mode 100644
index 000000000..7d0b75bf4
--- /dev/null
+++ b/vendor/github.com/twitchyliquid64/golang-asm/obj/x86/ytab.go
@@ -0,0 +1,44 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package x86
+
+// argListMax specifies upper arg count limit expected to be carried by obj.Prog.
+// Max len(obj.Prog.RestArgs) can be inferred from this to be 4.
+const argListMax int = 6
+
+type argList [argListMax]uint8
+
+type ytab struct {
+	zcase   uint8
+	zoffset uint8
+
+	// Last arg is usually destination.
+	// For unary instructions unaryDst is used to determine
+	// if single argument is a source or destination.
+	args argList
+}
+
+// Returns true if yt is compatible with args.
+//
+// Elements from args and yt.args are used
+// to index ycover table like `ycover[args[i]+yt.args[i]]`.
+// This means that args should contain values that already
+// multiplied by Ymax.
+func (yt *ytab) match(args []int) bool {
+	// Trailing Yxxx check is required to avoid a case
+	// where shorter arg list is matched.
+	// If we had exact yt.args length, it could be `yt.argc != len(args)`.
+	if len(args) < len(yt.args) && yt.args[len(args)] != Yxxx {
+		return false
+	}
+
+	for i := range args {
+		if ycover[args[i]+int(yt.args[i])] == 0 {
+			return false
+		}
+	}
+
+	return true
+}