[webkit-changes] [WebKit/WebKit] ab0808: Fix nullptr deref in B3::ReduceStrength's handling...

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  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: ab0808f76fdb011db0cb037137d236849534ac26
      https://github.com/WebKit/WebKit/commit/ab0808f76fdb011db0cb037137d236849534ac26
  Author: Mark Lam <mark.lam at apple.com>
  Date:   2023-12-05 (Tue, 05 Dec 2023)

  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:
  -----------
  Fix nullptr deref in B3::ReduceStrength's handling of Trunc for double constants.
https://bugs.webkit.org/show_bug.cgi?id=265730
rdar://116459635

Reviewed by Yusuke Suzuki.

We cannot run asInt64() on a ConstDoubleValue.  This patch fixes this by handling
ConstDoubleValue separately and running asDouble() on it instead.

* Source/JavaScriptCore/b3/B3ReduceStrength.cpp:

Canonical link: https://commits.webkit.org/271580@main