[webkit-changes] [WebKit/WebKit] 3a144e: [JSC] Register allocator should rematerialize cons...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 3a144e8081a754700d635475cfae53b2b863fab0
      https://github.com/WebKit/WebKit/commit/3a144e8081a754700d635475cfae53b2b863fab0
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2024-07-29 (Mon, 29 Jul 2024)

  Changed paths:
    M Source/JavaScriptCore/b3/air/AirAllocateRegistersByGraphColoring.cpp
    M Source/JavaScriptCore/b3/air/AirUseCounts.h

  Log Message:
  -----------
  [JSC] Register allocator should rematerialize constants
https://bugs.webkit.org/show_bug.cgi?id=277197
rdar://132619729

Reviewed by Justin Michaud.

Our register allocator is not implementing rematerialization part of the
original paper: using constant rematerialization when we spill constants.
This patch implements this feature so that we can rematerialize constant.

* Source/JavaScriptCore/b3/air/AirAllocateRegistersByGraphColoring.cpp:
* Source/JavaScriptCore/b3/air/AirUseCounts.h:
(JSC::B3::Air::UseCounts::UseCounts):
(JSC::B3::Air::UseCounts::isConstDef const):
(JSC::B3::Air::UseCounts::constant const):
(JSC::B3::Air::UseCounts::numWarmUsesAndDefs const):

Canonical link: https://commits.webkit.org/281509@main



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