[Webkit-unassigned] [Bug 122746] New: [sh4] Introduce const pools in LLINT

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Oct 14 02:45:48 PDT 2013


           Summary: [sh4] Introduce const pools in LLINT
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jbriance at cisco.com

In current implementation of LLINT for sh4, immediate values outside range -128..127 are loaded this way:

            mov.l .label, rx
            bra out
            .balign 4
            .label: .long immvalue

These immediate values could be grouped in constant pools placed behind non-return opcodes to avoid useless branches and reduce code size.

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