[all-commits] [llvm/llvm-project] 4875e0: [BOLT][NFC] Improve performance of MCPlusBuilder::...

[Job Noorman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4875e0670926b0a40ce0dd2c3d490b1866889f54
      https://github.com/llvm/llvm-project/commit/4875e0670926b0a40ce0dd2c3d490b1866889f54
  Author: Job Noorman <jnoorman at igalia.com>
  Date:   2023-03-13 (Mon, 13 Mar 2023)

  Changed paths:
    M bolt/lib/Core/MCPlusBuilder.cpp

  Log Message:
  -----------
  [BOLT][NFC] Improve performance of MCPlusBuilder::initAliases

It was using a redundant iteration over super regs to build
SmallerAliasMap. Removing this results in exactly the same alias maps
and a noticeable performance gain on targets with a large number of
registers.

Just anecdotally: on my machine, processing a small AArch64 binary went
from 2.7s down to 80ms.

Reviewed By: Amir

Differential Revision: https://reviews.llvm.org/D145779