On Tue, May 30, 2006 at 09:03:54PM +0100, Paul Brook wrote: > > I found arm.md and the moveqi insns, but because of the different > > addressing modes of strb and swpb, its not easy to make the change. > > And there must be a compiler option for this, too. > > > > Could somebody please tell me how to implement this change? > > Short answer is probably not. > > There are a couple of complications that spring to mind. The different > addressing modes and the fact that swp clobbers a register are the most > immediate ones. > > You'll need to modify at least the movqi insn patterns, memory constraints > and > the legitimate address stuff. I'm not sure about the clobber, that might need > additional reload-related machinery.
I suspect it would be better to make GCC do halfword stores instead (read/modify/write). -- Daniel Jacobowitz CodeSourcery
