On Wed, 2010-01-06 at 18:26 +0000, Paul Brook wrote: > On Wednesday 06 January 2010, Carrot Wei wrote: > > So thumb2 can also use the instructions similar to thumb1, right? It > > potentially has better performance and smaller code size. > > Technically yes, however in ARMv7 the relevant instruction (add.n <reg>, pc) > is deprecated.
Where'd you get that idea? Annex D of the ARM ARM says that the 16-bit instructions that add SP and PC together (writing either SP or PC) are deprecated, but there's nothing else using PC that's mentioned there other than trying to move PC into SP or vice-versa. All the deprecated instructions in this area are pretty meaningless in real life anyway. R.
