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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Mon Nov 16 01:25:58 GMT 2020


--- Comment #17 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #15)
> this is really handy.


> ld immediate clearly at the top.  li is a compound pseudo op, also at the
> top.  mv, addi/s, make sense.  extsw not so much.

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.

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