[webkit-changes] [WebKit/WebKit] d8082c: [JSC] Add VectorZipX(a, all-zeros) strength reduction

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: d8082ccd8788955200b95084e2bad3e933fdff05
      
https://github.com/WebKit/WebKit/commit/d8082ccd8788955200b95084e2bad3e933fdff05
  Author: Yusuke Suzuki <ysuz...@apple.com>
  Date:   2026-07-22 (Wed, 22 Jul 2026)

  Changed paths:
    M Source/JavaScriptCore/b3/B3ReduceStrength.cpp
    M Source/JavaScriptCore/b3/testb3.h
    M Source/JavaScriptCore/b3/testb3_1.cpp
    M Source/JavaScriptCore/b3/testb3_7.cpp

  Log Message:
  -----------
  [JSC] Add VectorZipX(a, all-zeros) strength reduction
https://bugs.webkit.org/show_bug.cgi?id=319991
rdar://182920842

Reviewed by Yijia Huang.

This patch adds strength reduction rules for

    VectorZipHigher(a, all-zeros)
    VectorZipLower(a, all-zeros)

Taking low / high part of each narrow lane and extending it with zeros,
so this is VectorExtendHigh / VectorExtendLow.

Tests: Source/JavaScriptCore/b3/testb3_1.cpp
       Source/JavaScriptCore/b3/testb3_7.cpp

* Source/JavaScriptCore/b3/B3ReduceStrength.cpp:
* Source/JavaScriptCore/b3/testb3.h:
* Source/JavaScriptCore/b3/testb3_1.cpp:
(run):
* Source/JavaScriptCore/b3/testb3_7.cpp:
(testVectorZipZeroExtendForLane):
(testVectorZipWithZeroIsZeroExtend):

Canonical link: https://commits.webkit.org/317726@main



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