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ffc29120c4
Previously, the sole responsibility of loop_analysis was to find all the variables referenced in the loop that are either loop constant or induction variables, and find all of the simple if statements that might terminate the loop. The remainder of the analysis necessary to determine how many times a loop executed was performed by loop_controls. This patch makes loop_analysis also responsible for determining the number of iterations after which each loop terminator will terminate the loop, and for figuring out which terminator will terminate the loop first (I'm calling this the "limiting terminator"). This will allow loop unrolling to make use of information that was previously only visible from loop_controls, namely the identity of the limiting terminator. Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> |
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