From 5012ddc8ebeb996abdf6da94fbd489420860d5e9 Mon Sep 17 00:00:00 2001
From: Dmitry Vyukov <dvyukov@google.com>
Date: Sat, 30 Jun 2018 13:27:24 +0200
Subject: prog: detect when flags are a bitmask

---
 pkg/compiler/types.go | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'pkg/compiler')

diff --git a/pkg/compiler/types.go b/pkg/compiler/types.go
index 97f7d18c4..c41ce4bdf 100644
--- a/pkg/compiler/types.go
+++ b/pkg/compiler/types.go
@@ -244,9 +244,20 @@ var typeFlags = &typeDesc{
 				Kind:          prog.IntPlain,
 			}
 		}
+		bitmask := true
+		var combined uint64
+		values := genIntArray(f.Values)
+		for _, v := range values {
+			if v&combined != 0 {
+				bitmask = false
+				break
+			}
+			combined |= v
+		}
 		return &prog.FlagsType{
 			IntTypeCommon: base,
-			Vals:          genIntArray(f.Values),
+			Vals:          values,
+			BitMask:       bitmask,
 		}
 	},
 }
-- 
cgit mrf-deployment