[Webkit-unassigned] [Bug 72857] Optimize JITArithmetic32_64.cpp:: op_add & op_sub

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=72857





--- Comment #5 from Filip Pizlo <fpizlo at apple.com>  2011-11-22 13:23:19 PST ---
The problem here is that this patch changes code that is known to work, and does not produce a speed-up in our high-performance configuration (DFG_JIT enabled).  It also deactivates one of the mechanisms we have for ensuring that the DFG correctly compiles code for integer addition that overflows.

Do you believe there is value in speeding up the baseline JIT even though it doesn't produce speed-ups when the DFG is enabled, and it runs the risk of introducing performance pathologies in the DFG?

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