[Webkit-unassigned] [Bug 173929] New: LLint ARM64 assembler can't compare and branch with SP as second operand

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173929

            Bug ID: 173929
           Summary: LLint ARM64 assembler can't compare and branch with SP
                    as second operand
           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: jfbastien at apple.com
                CC: fpizlo at apple.com, jfbastien at apple.com,
                    keith_miller at apple.com, mark.lam at apple.com,
                    msaboff at apple.com, sbarati at apple.com

See build break in: https://bugs.webkit.org/show_bug.cgi?id=173922

`subs xzr, x1, sp` isn't a valid instruction in ARM64. arm64.rb should know how to flip operands and condition if the last operand is sp.

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