Hey,
This could also be a dynamic stack realignment (for support of
vectorization). I didn't think x86-64 needed that, though.
Basically I guess I worry about use of DW_CFA_def_cfa_expression.
From what I can tell it's little used on x86-64 (linux) except for
syscall page and a few glibc exceptions.
Does anyone know any real-life uses of these?
I've only tried GCC up to 4.3.2 myself and don't see any use of these
on systems I tried (readelf --debug-dump=frames {/usr,}/lib64/*.so* |
grep DW_CFA_def_ | sort | uniq -c | less)
Lassi
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