A Single Pass Algorithm for Eliminating Constraint Checks in Ada Programs
A Single Pass Algorithm for Eliminating Constraint Checks in Ada Programs
H Operowsky
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:= i + r; where c = 1 or -1. Then as each assignment statement within the body of the loop is processed, the following actions are taken: When processing a for statement: Add pseudo constraint checks for the loop parameter. Mark the loop parameter ? as a basic induction variable. Add the loop parameter to the list of basic induction variables with 49 template {i, i, 1, 1) or {i, i, 1, -1), depending on the direction of the loop. 7. 2. 3 Loop Body Processing When processing each statement in the... loop, in addition to determining the constraint checks required, we determine whether the statement creates any induction variables, or invalidates any variables as induction variables. Process assignment statements in the for loop as follows: if the statement is of the form / := ?' + c;, c constant, then if i was already marked as a basic induction variable with formula {i, i, l, d) then if sign(c) = sign(d) then --|'l »^ increasing through the loop Update current formula to {i, i, l, c + d).
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