David Green 8cfc080132 [ARM] Limit v6m unrolling with multiple live outs ...

v6m cores only have a limited number of registers available. Unrolling
can mean we spend more on stack spills and reloads than we save from the
unrolling. This patch adds an extra heuristic to put a limit on the
unroll count for loops with multiple live out values, as measured from
the LCSSA phi nodes.

Differential Revision: https://reviews.llvm.org/D104659

2021-06-23 16:36:37 +01:00

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