[all-commits] [llvm/llvm-project] 9e51d1: [InstrProfiling] If no value profiling, make data ...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9e51d1f348b95affe6a8345ce3906997a49f0297
      https://github.com/llvm/llvm-project/commit/9e51d1f348b95affe6a8345ce3906997a49f0297
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-06-04 (Fri, 04 Jun 2021)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
    M llvm/test/Instrumentation/InstrProfiling/comdat.ll
    M llvm/test/Instrumentation/InstrProfiling/icall.ll
    M llvm/test/Instrumentation/InstrProfiling/linkage.ll
    M llvm/test/Instrumentation/InstrProfiling/platform.ll
    M llvm/test/Instrumentation/InstrProfiling/profiling.ll
    M llvm/test/Transforms/PGOProfile/comdat_internal.ll

  Log Message:
  -----------
  [InstrProfiling] If no value profiling, make data variable private and (for Windows) use one comdat

`__profd_*` variables are referenced by code only when value profiling is
enabled. If disabled (e.g. default -fprofile-instr-generate), the symbols just
waste space on ELF/Mach-O. We change the comdat symbol from `__profd_*` to
`__profc_*` because an internal symbol does not provide deduplication features
on COFF. The choice doesn't matter on ELF.

(In -DLLVM_BUILD_INSTRUMENTED_COVERAGE=on build, there is now no `__profd_*` symbols.)

On Windows this enables further optimization. We are no longer affected by the
link.exe limitation: an external symbol in IMAGE_COMDAT_SELECT_ASSOCIATIVE can
cause duplicate definition error.
https://lists.llvm.org/pipermail/llvm-dev/2021-May/150758.html
We can thus use llvm.compiler.used instead of llvm.used like ELF (D97585).
This avoids many `/INCLUDE:` directives in `.drectve`.

Here is rnk's measurement for Chrome:
```
This reduced object file size of base_unittests.exe, compiled with coverage, optimizations, and gmlt debug info by 10%:

#BEFORE

$ find . -iname '*.obj' | xargs du -b | awk '{ sum += $1 } END { print sum}'
1047758867

$ du -cksh base_unittests.exe
82M     base_unittests.exe
82M     total

# AFTER

$ find . -iname '*.obj' | xargs du -b | awk '{ sum += $1 } END { print sum}'
937886499

$ du -cksh base_unittests.exe
78M     base_unittests.exe
78M     total
```

The change is NFC for Mach-O.

Reviewed By: davidxl, rnk

Differential Revision: https://reviews.llvm.org/D103372