[webkit-changes] [WebKit/WebKit] dcb161: [JSC] Use more specific zero-clearing pattern in M...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: dcb1617e7a2923496e978d414fadffc748235f23
      https://github.com/WebKit/WebKit/commit/dcb1617e7a2923496e978d414fadffc748235f23
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2023-06-26 (Mon, 26 Jun 2023)

  Changed paths:
    M Source/JavaScriptCore/assembler/ARM64Assembler.h
    M Source/JavaScriptCore/assembler/MacroAssemblerARM64.h

  Log Message:
  -----------
  [JSC] Use more specific zero-clearing pattern in MacroAssembler
https://bugs.webkit.org/show_bug.cgi?id=258497
rdar://problem/111282793

Reviewed by Keith Miller.

Use the most efficient & CPU friendly instruction for zero-clearing registers.

* Source/JavaScriptCore/assembler/ARM64Assembler.h:
* Source/JavaScriptCore/assembler/MacroAssemblerARM64.h:
(JSC::MacroAssemblerARM64::moveZeroToDouble):
(JSC::MacroAssemblerARM64::moveZeroToFloat):
(JSC::MacroAssemblerARM64::move):
(JSC::MacroAssemblerARM64::moveZeroToVector):

Canonical link: https://commits.webkit.org/265522@main