[webkit-changes] [WebKit/WebKit] fee47c: [JSC] Use ZeroReg for store8 / store16 in ARM64 B3...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: fee47c730a954e40d85076e0b498fe14ddb1b318
      https://github.com/WebKit/WebKit/commit/fee47c730a954e40d85076e0b498fe14ddb1b318
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2023-05-19 (Fri, 19 May 2023)

  Changed paths:
    M Source/JavaScriptCore/assembler/MacroAssemblerARM64.h
    M Source/JavaScriptCore/assembler/testmasm.cpp
    M Source/JavaScriptCore/b3/B3LowerToAir.cpp
    M Source/JavaScriptCore/b3/air/AirOpcode.opcodes

  Log Message:
  -----------
  [JSC] Use ZeroReg for store8 / store16 in ARM64 B3/Air
https://bugs.webkit.org/show_bug.cgi?id=257070
rdar://109591267

Reviewed by Justin Michaud.

This patch extends B3/Air to use ZeroReg for store8 / store16 in ARM64.
This allows us to remove zero-stored register usage further, which can reduce register pressure.

* Source/JavaScriptCore/assembler/MacroAssemblerARM64.h:
(JSC::MacroAssemblerARM64::store16):
(JSC::MacroAssemblerARM64::store8):
* Source/JavaScriptCore/assembler/testmasm.cpp:
(JSC::testStoreImmediateAddress):
(JSC::testStoreImmediateBaseIndex):
* Source/JavaScriptCore/b3/B3LowerToAir.cpp:
* Source/JavaScriptCore/b3/air/AirOpcode.opcodes:

Canonical link: https://commits.webkit.org/264285@main