[Pipelines] Additional unrolling in LTO #536
Merged
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Some workloads require specific sequences of events to happen
to fully simplify. This adds an extra full unrolling pass to help these
cases on the cores with branch predictors. It helps produce simplified
loops, which can then be SROA'd allowing further simplification, which
can be important for performance.
Feature adds extra compile time to get extra performance and
is enabled by the opt flag 'extra-LTO-loop-unroll' (off by default).
Original patch by David Green (david.green@arm.com)