[Libre-soc-bugs] [Bug 238] POWER Compressed Formal Standard writeup

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=238

--- Comment #19 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #17)

> extsw is required for passing a signed 32-bit int according to the Power
> ABI, most instructions don't sign-extend their result (they often leave the
> upper 32-bits undefined) so extsw is required.

yuk.  ok that explains it.  i added extsb for no good reason.

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