[Webkit-unassigned] [Bug 242816] New: [JSC] Improve same-register moves in AirAllocateRegistersAndStackAndGenerateCode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242816

            Bug ID: 242816
           Summary: [JSC] Improve same-register moves in
                    AirAllocateRegistersAndStackAndGenerateCode
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jgriego at igalia.com

When we are emitting a `Move` from a Tmp to a named-register Tmp that matches
its current allocation, we currently generate code that spills the source tmp to
the stack, allocates a new (distinct) register for it, restores it there, and
then moves it; this seems wasteful and, although this kind of situation in Air
is not common on x86_64, we do generate it on 32-bit ARM targets

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