[Webkit-unassigned] [Bug 12535] Stack-optimizing compilers can trick GC into freeing in-use objects

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Feb 9 18:10:33 PST 2007


------- Comment #21 from mjs at apple.com  2007-02-09 18:10 PDT -------
I measured and this patch causes a 2% performance regression on the iBench, at
least on Mac OS X (where it is not even needed since the compiler won't
optimize out object pointers like that). I think this needs to be addressed
more along the lines of Anrong Hu's approach, where we keep the compiler from
dropping the pointer. I think copying to alloca()'d memory, or even just
keeping it in a struct on the stack might do it, and something that works for
current MSVC seems good enough.

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