[all-commits] [llvm/llvm-project] c28ddf: [Analysis] Use BitVector::test in areInlineCompati...

[Kazu Hirata via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c28ddf900051760e3ae8cef33b26da3c37f5627e
      https://github.com/llvm/llvm-project/commit/c28ddf900051760e3ae8cef33b26da3c37f5627e
  Author: Kazu Hirata <kazu at google.com>
  Date:   2024-07-14 (Sun, 14 Jul 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetLibraryInfo.h

  Log Message:
  -----------
  [Analysis] Use BitVector::test in areInlineCompatible (NFC) (#98776)

areInlineCompatible checks to see if CalleeTLI.OverrideAsUnavailable
is a subset of OverrideAsUnavailable by computing a union of the two
and comparing the union and OverrideAsUnavailable.

The problem is that computing a union involves memory allocations.
This patch removes the need for memory allocations by switching to
BitVector::test.  Note that A.test(B) returns true if A - B is
non-empty.  That is, !A.test(B) is true if A if a subset of B.

The use of BitVector::test here saves 0.20% of heap allocations during
the compilation of X86ISelLowering.cpp.ii, a preprocessed version of
X86ISelLowering.cpp.



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