[webkit-changes] [WebKit/WebKit] 1ad97a: [JSC] Use moveZeroToDouble instead of loading zero...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 1ad97a78a52930a297f536d9322c6a5ce29061b2
      https://github.com/WebKit/WebKit/commit/1ad97a78a52930a297f536d9322c6a5ce29061b2
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2023-06-29 (Thu, 29 Jun 2023)

  Changed paths:
    M Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp

  Log Message:
  -----------
  [JSC] Use moveZeroToDouble instead of loading zero from memory
https://bugs.webkit.org/show_bug.cgi?id=258710
rdar://111549946

Reviewed by Mark Lam.

Most of architectures have faster way to load double 0 to the register.
We use moveZeroToDouble instead of loadDouble(zeroConstantAddress, register).

* Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileDoubleRep):
(JSC::DFG::compileClampDoubleToByte):

Canonical link: https://commits.webkit.org/265643@main