[pypy-issue] [issue1529] C queue datastructure accessed via CFFI slower than Python counterpart

[Amaury Forgeot d Arc]

Amaury Forgeot d Arc <amauryfa at gmail.com> added the comment:

There is some unnecessary slowness when a function returns a function pointer.

In the ffi.cdef() declarations I modified deq() to return a void*,
then I added a cast in the calling code:
    fp = q.deq()
    fp = ffi.cast("FuncPtr", fp)
    fp()
this makes the "cpp" version much faster, 3x faster than the pure python version.

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assignedto:  -> arigo
nosy: +amaury, arigo

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