[PATCH] D79767: [ARM] Macro fuse t2LoopDec and t2LoopEnd

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: samparker, SjoerdMeijer, ostannard, efriedma.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, qcolombet, MatzeB.
Herald added a project: LLVM.

Fusing these two pseudo instructions together in the scheduler forces them to try and be closer together in the final assembly. This can help, but doesn't on it's own solve the problems of register allocation going awry and spilling lr in the loop.


https://reviews.llvm.org/D79767

Files:
  llvm/lib/Target/ARM/ARMMacroFusion.cpp
  llvm/lib/Target/ARM/ARMSubtarget.h
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/regalloc.ll

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