Reviewers: danno,
Description:
Narrows predicate for type bounds
[email protected]
BUG=
Please review this at https://codereview.chromium.org/170943005/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+4, -0 lines):
M src/types.h
Index: src/types.h
diff --git a/src/types.h b/src/types.h
index
99a809dc10d06ae5108e2c64667982c867018d0a..48b39335b63dcd5c4da0f468f30afd4efaa409d4
100644
--- a/src/types.h
+++ b/src/types.h
@@ -560,6 +560,10 @@ struct BoundsImpl {
TypeHandle upper = Type::Intersect(b.upper, t, region);
return BoundsImpl(lower, upper);
}
+
+ bool Narrows(BoundsImpl that) {
+ return that.lower->Is(this->lower) && this->upper->Is(that.upper);
+ }
};
typedef BoundsImpl<ZoneTypeConfig> Bounds;
--
--
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