[webkit-changes] [WebKit/WebKit] fa8841: [JSC] Do not use smull when shift is not following

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: fa884184b683dbe15c9fcfa08c4ac7768d65889c
      https://github.com/WebKit/WebKit/commit/fa884184b683dbe15c9fcfa08c4ac7768d65889c
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2025-03-23 (Sun, 23 Mar 2025)

  Changed paths:
    M Source/JavaScriptCore/b3/B3ReduceStrength.cpp

  Log Message:
  -----------
  [JSC] Do not use smull when shift is not following
https://bugs.webkit.org/show_bug.cgi?id=290274
rdar://147666338

Reviewed by Keith Miller.

We found that using smull for MulHigh has slight perf regression when
shift is not following after that. So this patch tweaks usage of that.

* Source/JavaScriptCore/b3/B3ReduceStrength.cpp:

Canonical link: https://commits.webkit.org/292564@main



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