[PATCH] D111806: [LICM] Check the number of divergent paths from loop header to target block

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri requested changes to this revision.
lebedev.ri added a comment.
This revision now requires changes to proceed.

As it's stated in the pass description, it is a canonicalization transform, performed without a costmodel,
and it's expected to be undone in backend.



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Comment at: llvm/lib/Transforms/Scalar/LICM.cpp:15-20
 // Hoisting operations out of loops is a canonicalization transform.  It
 // enables and simplifies subsequent optimizations in the middle-end.
 // Rematerialization of hoisted instructions to reduce register pressure is the
 // responsibility of the back-end, which has more accurate information about
 // register pressure and also handles other optimizations than LICM that
 // increase live-ranges.
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