[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 #20 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #19)
> (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.

signed 8 and 16-bit integers have the same issue. unsigned integers also
require zero-extension. maybe we should add all the sign/zero extension
instructions?

See: https://gcc.godbolt.org/z/9n48Gh

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