Re: floating-point loads vs dreamcast

Marcus Comstedt <[email protected]> Fri, 13 May 2011 23:38:52 +0200

Newsgroups	gmane.os.netbsd.ports.dreamcast
Message-ID	<[email protected]>

der Mouse <[email protected]> writes:

[...]
> Any idea what's going on here?  As I read the hardware docs,
> fmov @rN,drM certainly ought to do a 64-bit double-precision load.

Only if you set SZ to 1.  PR controls the size of arithmetic
operations, SZ controls the size of loads and stores.

  fmov   @rN,drM and
  fmov.s @rN,frM

has exactly the same encoding (1111nnnnmmmm1000) (only that m needs to
be even in the 64 bit case), SZ controls which one you get.  See
section 10.37 in the Programming Manual.

  // Marcus