[all-commits] [llvm/llvm-project] 8e7553: [DebugInfo][InstrRef][NFC] Bypass a frequently-noo...

[Jeremy Morse via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8e75536e510460bedcfdafb38d58cdfb7bb66111
      https://github.com/llvm/llvm-project/commit/8e75536e510460bedcfdafb38d58cdfb7bb66111
  Author: Jeremy Morse <jeremy.morse at sony.com>
  Date:   2022-02-01 (Tue, 01 Feb 2022)

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

  Log Message:
  -----------
  [DebugInfo][InstrRef][NFC] Bypass a frequently-noop loop

Bypass this loop if it would do nothing -- if there are no register masks
to be examined, there's no point looking at each location to see if the
location has been def'd. Awkwardly, this was responsible for almost an
entire half a percent of performance improvement on CTMark.

Differential Revision: https://reviews.llvm.org/D118613