Partial connection of iterations during loop unrolling
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United States of America Patent
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Sep 18, 2018
Grant Date -
Jan 25, 2018
app pub date -
Jul 20, 2016
filing date -
Jul 20, 2016
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Abstract
A method and system for partial connection of iterations during loop unrolling during compilation of a program by a compiler. Unrolled loop iterations of a loop in the program are selectively connected, including redirecting, to the head of the loop, undesirable edges of a control flow from one iteration to a next iteration of the loop. Merges on a path of hot code are removed to increase a scope for optimization of the program. The head of the loop and a start of a replicated loop body of the loop are equivalent points of the control flow. A sequence of blocks on the path of hot code, unpolluted by a control flow of a path of cold code, is extended during the compilation. Information computed by an optimizer about the hot code in a first iteration is used to further optimize a second iteration, and the loop is further unrolled.
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