[all-commits] [llvm/llvm-project] 4e6d37: [LiveDebugValues] Use std::sort for register sorti...

[Cullen Rhodes via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4e6d3722fca73c97367720180a8d547057fda380
      https://github.com/llvm/llvm-project/commit/4e6d3722fca73c97367720180a8d547057fda380
  Author: Cullen Rhodes <cullen.rhodes at arm.com>
  Date:   2026-04-27 (Mon, 27 Apr 2026)

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

  Log Message:
  -----------
  [LiveDebugValues] Use std::sort for register sorting in collectIDsForRegs (#194339)

VarLocBasedLDV::collectIDsForRegs sorts a SmallVector<Register> using
array_pod_sort which is a thin wrapper around qsort. That shows up as a hotspot
in compile-time profiles under __GI___qsort_r.

Switching this to an explicit-comparator llvm::sort call, which takes the
std::sort path instead improves compile-time with no change to code-size.

CTMark geomean:
- stage1-O0-g: -0.41%
- stage1-aarch64-O0-g: -0.58%
- stage2-O0-g: -0.40%

http://llvm-compile-time-tracker.com/compare.php?from=347aa3f6fbcc48cd752d02aa581b74c33d18dd41&to=cca8df56a576682510733c4c1b6fc12556e2dd7c&stat=instructions%3Au



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