[Webkit-unassigned] [Bug 136435] New: offlineasm generates suboptimal code for move immediate on ARM64

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136435

           Summary: offlineasm generates suboptimal code for move
                    immediate on ARM64
           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: akiss at inf.u-szeged.hu
                CC: dbates at webkit.org, msaboff at apple.com, fpizlo at apple.com


emitARM64MoveImmediate generates a slightly suboptimal code if value is greater than 0xffff but the last 16 bits are all zeros, or less than ~0xffff but the last 16 bits are all ones. E.g.,

move 0xffff000000000000, csr1

in LowLevelInterpreter64.asm becomes

movz x27, #65535, lsl #48
movk x27, #0, lsl #0

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