[webkit-changes] [WebKit/WebKit] d13041: Fixes to B3LowerInt64.cpp

[aoikonomopoulos]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: d13041df8fffdf28b55e73e7577d77d64b7bb9f3
      https://github.com/WebKit/WebKit/commit/d13041df8fffdf28b55e73e7577d77d64b7bb9f3
  Author: Angelos Oikonomopoulos <angelos at igalia.com>
  Date:   2024-07-24 (Wed, 24 Jul 2024)

  Changed paths:
    M Source/JavaScriptCore/b3/B3LowerInt64.cpp

  Log Message:
  -----------
  Fixes to B3LowerInt64.cpp
https://bugs.webkit.org/show_bug.cgi?id=276949

Reviewed by Yusuke Suzuki.

Fixes a number of bugs:
- Drop synthetic values so that we can safely delete m_zero. If we didn't
  delete m_zero, that would result in malformed B3 (which would fail
  validation).
- Trunc also applies to Double, we only need to lower the Int64 variant.
- Implement TruncHigh/Stitch, so that they can be used by
  OMGIRGenerator.
- Fix SExt{8,16}To64.
- Passthrough more no-op opcodes.

* Source/JavaScriptCore/b3/B3LowerInt64.cpp:

Canonical link: https://commits.webkit.org/281284@main



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