Could anybody help to review the small patch http://gcc.gnu.org/ml/gcc-patches/2010-01/msg00531.html
thanks Guozhi On Sat, Jan 9, 2010 at 7:25 PM, Carrot Wei <car...@google.com> wrote: > OK, I filed a bug to trace it. > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42671 > > thanks > Guozhi > > On Thu, Jan 7, 2010 at 6:23 PM, Richard Earnshaw <rearn...@arm.com> wrote: >> >> 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. >> >> >
