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for transforming irreducible control flow graphs to reducible control flow graphs .
Outline. Control-Flow Analysis. Dominators. Graph Traversal. Reducible
obtained by removing the backedges is the same as the dominator tree of the
. of: procuring a single entry point reducible control flow graph representing at .
Control Flow Analysis. 9/23/ . Start node dominates every node in the flow graph
Early studies of control-flow graphs in Fortran found that almost all of them are
Basic blocks; Control-flow graphs. Discuss application of graph algorithms: loops.
Advantages of reducible flow graphs. . However, for the remainder of this
In a control flow graph, any node unreachable from s can be safely deleted. . . A
Dominance in Control Flow Graphs . A node x in a flow graph G dominates node
The technique bases on the control flow graph which consists of basic blocks . ..
Additional Key Words and Phrases: Compilation, control flow graphs, loops,
A new method for transforming irreducible control flow graphs to reducible control
Control-flow analysis discovers the flow of control within a procedure. (e.g., builds
Tags: algorithms code optimization compilation compilers control flow graphs
Strongly connected components. Identifying Loops. Reducible Control Flow
Many program analysis techniques used by compilers are applicable only to
Draw the control flow graph. 2. Is the flow graph reducible? If not, transform it into
nodes is a subgraph of some maximal reducible flow graph. of n nodes. .
Fortunately most control flow graphs are reducible, nevertheless the problem of .
A control flow graph (V,E) is reducible iff it can be partitioned into two sets of
and edges in the control-flow graph, this algorithm has a worst-case running time
Node Splitting (CNS), for transforming irreducible control flow graphs to . CNS
Jump to: navigation, search. Simplified control flowgraphs. A control flow graph (
1.For the routine on the following page, generate the control flow graph. and then
Reducible Control Flow Graphs. ▪ Basic block graph reducible ⇔ interval
Use a Control-flow graph. Nodes . p (p dom i in the flow graph whose arcs are
More Control Flow . flowgraph reducible iff all loops in it natural . Some
node splitting can make a control-flow graph reducible [1, 3, 10]. Unfortunately,
Control Flow Graphs . . A control flow graph is reducible iff we can partition the
It is established that if G is a reducible flow graph, then edge ( n, m ) is . Frances
Use a Control-flow graph. Nodes . p (p dom i in the flow graph whose arcs are
That is, given a control-flow graph G = <N, E>, G'=<N, E'> is a reverse control-flow
convert any control flow graph to a reducible one. However,. as has been
Mar 8, 2011 . reliably used when the control flow graph (CFG) of a program is reducible. In a
Control-flow graph (CFG) for a procedure/method. A node . An edge
Control flow graph with dominator relation to identify loops. ■ . Basic Blocks
T1/T2 are iteratively applied on the flow graph reducing it to a simpler one: Tl .
That is, given a control flow graph. G =< N,E >, G =< N,E > is a reverse control
graph (RPG) [7], which is a reducible control flow-graph with maximum out-
If, however, you were to jump into the middle of a loop so that the loop has
Jan 26, 1994 . graphs the same way as they are in reducible graphs: a back-edge in the control
For the following control flow graph, for the purposes of a forward data flow
Outline of the Lecture. Why control flow analysis? Dominators and natural loops.
Build control-flow graph. 3. Analyze CFG to find loops . Directed edge: potential
Reducible Control Flow Graphs. A CFG is reducible if and only if the directed
CNS duplicates nodes of the control flow graph to obtain reducible control flow
CS624 - NOTES ON CONTROL FLOW GRAPH. ERNESTO GOMEZ. The control
Reducible Flow Graphs in i PFEICΘΝCE. I Common controlflow constructs yield
In general it is not easy to find loops in control flow graphs [Ram99j. However, if
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