[all-commits] [llvm/llvm-project] d9eebe: [DebugInfo][InstrRef] Add unit tests for transfer-...

[Jeremy Morse via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d9eebe3cd7832b69471b27e68f0ee6f1374ed759
      https://github.com/llvm/llvm-project/commit/d9eebe3cd7832b69471b27e68f0ee6f1374ed759
  Author: Jeremy Morse <jeremy.morse at sony.com>
  Date:   2021-10-22 (Fri, 22 Oct 2021)

  Changed paths:
    M llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
    M llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h
    M llvm/unittests/CodeGen/InstrRefLDVTest.cpp

  Log Message:
  -----------
  [DebugInfo][InstrRef] Add unit tests for transfer-function building

This patch adds some unit tests for the machine-location transfer-function
building parts of InstrRefBasedLDV: i.e., test that if we feed some MIR
into the transfer-function building code, does it create the correct
transfer function.

There are a number of minor defects that get corrected in the process:
 * The unit test was selecting the x86 (i.e. 32 bit) backend rather than
   x86_64's 64 bit backend,
 * COPY instructions weren't actually having their subregister values
   correctly represented in the transfer function. Subregisters were being
   defined by the COPY, rather than taking the value in the source register.
 * SP aliases were at risk of being clobbered, if an SP subregister was
   clobbered.

Differential Revision: https://reviews.llvm.org/D112006