'Greatest lower bound glb' presentation slideshows

Worklist algorithm

Worklist algorithm. Initialize all d i to the empty set Store all nodes onto a worklist while worklist is not empty: remove node n from worklist apply flow function for node n update the appropriate d i , and add nodes whose inputs have changed back onto worklist. Worklist algorithm.

597 views • 59 slides

Administrative stuff

Administrative stuff. Office hours: After class on Tuesday. 1: x := ... 2: y := ... 3: y := ... 4: p :=. ... x ... 5: x := ... ... y. ... x ... 6: x := ... 7: *p :=. ... x ... ... y ... 8: y :=. Worklist algorithm. Initialize all d i to the empty set

414 views • 41 slides

Recap: Reaching defns algorithm

Recap: Reaching defns algorithm. From last time: reaching defns worklist algo We want to avoid using structure of the domain outside of the flow functions. Will use lattices!. while (worklist.empty.not) do let n := worklist.remove_any; let info_in := m(n.incoming_edges);

364 views • 36 slides

What is a Fixpoint (aka, Fixed Point)

CS 267: Automated Verification Lecture 3: Fixpoints and Temporal Properties Instructor: Tevfik Bultan. What is a Fixpoint (aka, Fixed Point). Given a function F : D ? D x ? D is a fixpoint of F if and only if F (x) = x. Temporal Properties ? Fixpoints [Emerson and Clarke 80].

425 views • 34 slides

Lub and glb

332 views • 28 slides