[PATCH] D93054: [ARM] Add bank conflict hazarding

[David Penry via Phabricator via llvm-commits]

dpenry created this revision.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
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Adds ARMBankConflictHazardRecognizer.  This hazard recognizer
looks for a few situations where the same base pointer is used and
then checks whether the offsets lead to a bank conflict.  Two
parameters are also added to permit overriding of the target
assumptions:

arm-data-bank-mask=<int> - Mask of bits which are to be checked for

  conflicts.  If all these bits are equal in
  the offsets, there is a conflict.

arm-assume-itcm-bankconflict=<bool> - Assume that there will be bank

  conflicts on any loads to a constant
  pool.

This hazard recognizer is enabled for Cortex-M7, where the Technical Reference
Manual states that there are two DTCM banks banked using bit 2 and one ITCM
bank.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93054

Files:
  llvm/lib/Target/ARM/ARM.td
  llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
  llvm/lib/Target/ARM/ARMBaseInstrInfo.h
  llvm/lib/Target/ARM/ARMHazardRecognizer.cpp
  llvm/lib/Target/ARM/ARMHazardRecognizer.h
  llvm/lib/Target/ARM/ARMSubtarget.cpp
  llvm/lib/Target/ARM/ARMSubtarget.h
  llvm/test/CodeGen/Thumb2/schedm7-hazard.ll

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