[webkit-changes] [WebKit/WebKit] 8ec391: [JSC] Use _Float16 only on ARM64

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 8ec391b67096934e7fa8ac15053abccc9ecce234
      https://github.com/WebKit/WebKit/commit/8ec391b67096934e7fa8ac15053abccc9ecce234
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2024-08-12 (Mon, 12 Aug 2024)

  Changed paths:
    M Source/WTF/wtf/PlatformHave.h

  Log Message:
  -----------
  [JSC] Use _Float16 only on ARM64
https://bugs.webkit.org/show_bug.cgi?id=277972
rdar://133706761

Reviewed by Mark Lam.

x64 Float16 implementation is subpar compared to ARM64 because of lack of CPU instructions.
And given that various issues around rt library, just using our C++ implementation would be better for x64.
We use `_Float16` only for ARM64, which has FP16 instructions, in particular on Apple platforms.

* Source/WTF/wtf/PlatformHave.h:

Canonical link: https://commits.webkit.org/282152@main



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