[Webkit-unassigned] [Bug 165820] New: BytecodeBasicBlock::computeImpl() should not keep iterating blocks if all jump targets have already been found.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165820

            Bug ID: 165820
           Summary: BytecodeBasicBlock::computeImpl() should not keep
                    iterating blocks if all jump targets have already been
                    found.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

Currently, if an opcode is a branch type opcode. BytecodeBasicBlock::computeImpl() will iterate over all basic blocks looking for the block containing the jump target, and it will continue to do this even when all the jump targets have been found.  This is wasted work, and all the more so given that most branch type opcodes only have a single jump target.

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