Adam Nemet 7e94e7eb7e [LoopDataPrefetch] If prefetch distance is not set, skip pass
This lets select sub-targets enable this pass.  The patch implements the
idea from the recent llvm-dev thread:
http://thread.gmane.org/gmane.comp.compilers.llvm.devel/94925

The goal is to enable the LoopDataPrefetch pass for the Cyclone
sub-target only within Aarch64.

Positive and negative tests will be included in an upcoming patch that
enables selective prefetching of large-strided accesses on Cyclone.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262844 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-07 18:35:42 +00:00
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