[all-commits] [llvm/llvm-project] 9a90ea: [InstrProf] Fix promoter when using counter reloca...

[Ellis Hoag via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9a90ea1fdcd29f7245ec0bc1295ce96fc0ec2365
      https://github.com/llvm/llvm-project/commit/9a90ea1fdcd29f7245ec0bc1295ce96fc0ec2365
  Author: Ellis Hoag <ellis.sparky.hoag at gmail.com>
  Date:   2022-05-16 (Mon, 16 May 2022)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
    A llvm/test/Transforms/PGOProfile/counter_promo_with_bias.ll

  Log Message:
  -----------
  [InstrProf] Fix promoter when using counter relocations

When using counter relocations, two instructions are emitted to compute
the address of the counter variable.

```
%BiasAdd = add i64 ptrtoint <__profc_>, <__llvm_profile_counter_bias>
%Addr = inttoptr i64 %BiasAdd to i64*
```

When promoting a counter, these instructions might not be available in
the block, so we need to copy these instructions.

This fixes https://github.com/llvm/llvm-project/issues/55125

Reviewed By: phosek

Differential Revision: https://reviews.llvm.org/D125710