On Tue, 2014-05-13 at 09:10 +0100, Joern Rennecke wrote: > On 12 May 2014 23:39, Oleg Endo <oleg.e...@t-online.de> wrote: > > > This is the same as changing/setting the FP modes (PR, SZ) on SH while > > preserving the other FPSCR bits, or did I miss something? > > It's more like if you have to control multiple bits at once to get a > specific mode. > Say you have to turn SZ off and PR on. You you knew that only one bit needs > changing, you can do with one less arithmetic operation.
Right. I was thinking to add FPSCR.SZ mode switching to SH, in order to do float vector moves. For that SZ and PR need to be switched both at the same time (only SH4A has both, fpchg and fschg). So basically I'd add another mode entity, which would emit SZ mode changes in addition to the PR mode changes. But then adjacent FPSCR-changing insns could be combined ... any idea/suggestion how to accomplish that? Cheers, Oleg
