[pypy-dev] s390x libffi issue

[Richard Plangger]

Hi,

> libffi is *documented* to return the non sign-extended value.

I have fixed this issue at the call site. The caller sign/zero extends
narrower integer types. The reason I did not change it to that in the
first place is: I thought that it is not easy to determine this
information at the callsite (because it is not done in any other
backend). Apparently it is available.

Cheers,
Richard

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