[PATCH] D109683: [APInt] Add APIntOps::ScaleBitMask helper

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, lebedev.ri, lattner.
Herald added subscribers: dexonsmith, hiraditya.
RKSimon requested review of this revision.
Herald added a project: LLVM.

APInt is used to describe a bit mask in a variety of value tracking and demanded bits/elts functions.

When traversing through dst/src operands, we have a number of places where these masks need to widened/narrowed to translate through bitcasts, reductions etc. to a different type.

This patch add a APIntOps::ScaleBitMask common helper, adds unit test coverage, and updates a number of cases to use the the helper instead of their own implementation.

This came up on D109065 <https://reviews.llvm.org/D109065> where we currently have to add yet another implementation of the same code.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109683

Files:
  llvm/include/llvm/ADT/APInt.h
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Support/APInt.cpp
  llvm/unittests/ADT/APIntTest.cpp

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