[Webkit-unassigned] [Bug 159120] New: B3 should not use Nops when deleting unreachable code

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159120

            Bug ID: 159120
           Summary: B3 should not use Nops when deleting unreachable code
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Replacing an unreachable value with Nop is bad if the value is non-Void, since other unreachable code will now reference a Void value.  This can easily happen because deleting unreachable code is often an iterative process where you may not discover that the users of an unreachable value are unreachable until after you have already tried to do other things to those unreachable values.

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