Conditional execution

National Statistical Assessment of Rural Water Conditions Executive... 

Francis, J. Larson, 0. III. National Statistical Assessment of Rural Water Conditions. Executive Summary. Cornell University, Ithaca, 1983. 

The if statement allows for conditional execution of code by executing a code block only if a specified condition is determined to be true ... 

After space-time mapping, the conditional execution of several operations on the same processing element (PE) may be needed. Regularization techniques to address this problem are presented in chapter 4. 

Automatically applies block-level transformations to produce the dacon with the fastest implementation. Transformations supported merge adjacent bloi s, combine a block followed by two or more conditionally executed blocks into a single block, unroll loops, and move the test at the top of a loop to the bottom of the loop. 

ISPS provides two mechanisms for conditional execution. IF operations evaluate an expression, and execute an associated statement or block of statements if that expression evaluates true (non-zero). DECODE operations, similar to the SWITCH or CASE statements in other languages, evaluate an expression, and execute one of a set of alternate statements or statement blocks, depending on the value of the expression. 

This representation is sufficient to describe ISPS specifications containing a single straight-line sequence of statements with no changes in control flow. Additional features are necessary to describe and support control constructs such as conditional execution, loops, and procedures. 

Conditional execution. If an operation has more than one successor, exactly one of them is executed next. The selection of the successor in this case depends on a condition attached to the edge. A condition is a Boolean expression which evaluates to 1 if the next operation is to be executed and to 0 otherwise. In figure 2, operations 4 and 7 branch out to different successors conditionally. The conditions are indicated on the edges. 

HIS uses a modified global data-flow analysis based loosely on du-chaining (definition-use) [2]. Since most high-level synthesis literature does not address this step in detail and often restricts it to so called basic blocks (e.g., [38]), and since data-flow analysis can be computationally expensive, we include the exact algorithm used below. It first computes the reachability for each value assigned and then its lifetime. HIS performs global data-flow analysis not restricted to basic blocks. In this case the control flow (conditional execution and iteration) must be taken into account ... 

IF. . ELSEIF. . ELSE. . ENDIF Conditional execution control. 

Fonseca, J., N61is, V., Raravi, G., Pinho, L.M. A multi-DAG model for real-time parallel applications with conditional execution. In 30th ACM Symposium on Applied Computing (April 2015)... 

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