[PATCH] D57445: [ARM] Fix TTI IntImmCost

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: t.p.northover, dexonsmith, dmgreen, SjoerdMeijer, efriedma.
Herald added subscribers: kristof.beyls, javed.absar.

The cost of immediates returned from the backend was generally wrong, returning 1 for most immediates that could be directly encoded within an instruction. We now return 0 for these. The valuesreturned are now also more accurate, taking into consideration the exotic encoding patterns of Thumb2 immediates and calculating how many mov instructions would be needed to rematerialise a value.


https://reviews.llvm.org/D57445

Files:
  lib/Target/ARM/ARMTargetTransformInfo.cpp
  test/CodeGen/ARM/select_const.ll

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