[webkit-changes] [WebKit/WebKit] 257063: [WTF] Accelerate BitSet::isEmptySlow

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 2570633cde9906c52766c930173605fc00ddb418
      https://github.com/WebKit/WebKit/commit/2570633cde9906c52766c930173605fc00ddb418
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2024-09-23 (Mon, 23 Sep 2024)

  Changed paths:
    M Source/WTF/wtf/BitVector.cpp
    M Source/WTF/wtf/SIMDHelpers.h

  Log Message:
  -----------
  [WTF] Accelerate BitSet::isEmptySlow
https://bugs.webkit.org/show_bug.cgi?id=280142
rdar://136440785

Reviewed by Yijia Huang.

Use SIMD to accelerate BitSet::isEmptySlow as it is shown as super hot
in register allocator.

* Source/WTF/wtf/BitVector.cpp:
(WTF::BitVector::isEmptySlow const):
* Source/WTF/wtf/SIMDHelpers.h:
(WTF::SIMD::isNonZero):

Canonical link: https://commits.webkit.org/284061@main



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