[all-commits] [llvm/llvm-project] 0f22d4: [LTO] Teach computeLTOCacheKey to return std::stri...

[Kazu Hirata via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0f22d47a7a1f70ec77ea8ccdf08a6487827937db
      https://github.com/llvm/llvm-project/commit/0f22d47a7a1f70ec77ea8ccdf08a6487827937db
  Author: Kazu Hirata <kazu at google.com>
  Date:   2024-08-20 (Tue, 20 Aug 2024)

  Changed paths:
    M llvm/include/llvm/LTO/LTO.h
    M llvm/lib/LTO/LTO.cpp
    M llvm/lib/LTO/ThinLTOCodeGenerator.cpp

  Log Message:
  -----------
  [LTO] Teach computeLTOCacheKey to return std::string (NFC) (#105331)

Without this patch, computeLTOCacheKey computes SHA1, creates its
hexadecimal representation with toHex, which returns std::string, and
then copies it to an output parameter of type SmallString.

This patch removes the redirection and teaches computeLTOCacheKey to
directly return std::string computed by toHex.  With the move
semantics, no buffer copy should be involved.

While I am at it, this patch adds a Twine to concatenate two strings.



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