[all-commits] [llvm/llvm-project] eaa71a: [clang] Add optional pass to remove UBSAN traps us...

[Vitaly Buka via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: eaa71a97f9155ea9df33141ef2fb369dc8fc464f
      https://github.com/llvm/llvm-project/commit/eaa71a97f9155ea9df33141ef2fb369dc8fc464f
  Author: Vitaly Buka <vitalybuka at google.com>
  Date:   2024-03-11 (Mon, 11 Mar 2024)

  Changed paths:
    M clang/lib/CodeGen/BackendUtil.cpp
    A clang/test/CodeGen/remote-traps.c

  Log Message:
  -----------
  [clang] Add optional pass to remove UBSAN traps using PGO (#84214)

With #83471 it reduces UBSAN overhead from 44% to 6%.
Measured as "Geomean difference" on "test-suite/MultiSource/Benchmarks"
with PGO build.

On real large server binary we see 95% of code is still instrumented,
with 10% -> 1.5% UBSAN overhead improvements. We can pass this test only
with subset of UBSAN, so base overhead is smaller.

We have followup patches to improve it even further.



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