[webkit-changes] [WebKit/WebKit] b61536: [JSC] ConstFloat / ConstDouble Store should be con...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: b615369336441fa170d2bcfc0962d18a030ee6d2
      https://github.com/WebKit/WebKit/commit/b615369336441fa170d2bcfc0962d18a030ee6d2
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2023-06-09 (Fri, 09 Jun 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_4.cpp

  Log Message:
  -----------
  [JSC] ConstFloat / ConstDouble Store should be converted to Const32 / Const64 Store in B3
https://bugs.webkit.org/show_bug.cgi?id=257882
rdar://110509786

Reviewed by Keith Miller.

Materializing Const32 / Const64 in GPR is cheaper. So let's convert Store(ConstDoubleValue, address) / Store(ConstFloatValue, address)
to Store(Const64Value, address) / Store(ConstFloatValue, address). If the constant value is zero, then ARM64 can further use zero register
for that.

* Source/JavaScriptCore/b3/B3ReduceStrength.cpp:
* Source/JavaScriptCore/b3/testb3.h:
* Source/JavaScriptCore/b3/testb3_1.cpp:
(run):
* Source/JavaScriptCore/b3/testb3_4.cpp:
(testStoreDouble):
(testStoreDoubleConstant):
(testStoreFloatConstant):

Canonical link: https://commits.webkit.org/265026@main