David Edelsohn <dje....@gmail.com> wrote on 2010/04/26 14:54:55: > > On Mon, Apr 26, 2010 at 8:21 AM, Joakim Tjernlund > <joakim.tjernl...@transmode.se> wrote: > > Manuel López-Ibáñez <lopeziba...@gmail.com> wrote on 2010/04/26 13:59:04: > >> On 26 April 2010 09:13, Joakim Tjernlund <joakim.tjernl...@transmode.se> > >> wrote: > >> > Ian Lance Taylor <i...@google.com> wrote on 2010/04/25 20:07:03: > >> >> Joakim Tjernlund <joakim.tjernl...@transmode.se> writes: > >> >> > >> >> > Noticed that gcc 4.3.4 doesn't optimize "add with carry" properly: > >> >> > >> >> Please file a missed-optimization report according to > >> >> http://gcc.gnu.org/bugs/ . Thanks. > >> > > >> > I rather not, going through all that just for one odd report. I was > >> > hoping > >> > an interested part would pick it up from my email. > >> > >> What is to be done besides what you have done here but in a more > >> useful, structured manner? I am asking because we want to make things > >> simple but not simpler than they become more complex for us. > > > > Lots of stuff to read on that page, lots of info to supply, > > registering an account, specify all that system info and so on. > > You do not need to register an account to report a bug or request a
Just tried that and don't see that. > feature enhancement. Some of the information can be left blank, but > if we do not have information about the system and an example, we may > not understand the request or may not be able to reproduce the problem > and fix it. Just go look at that page, it is so much info that if the bug isn't very importat you quickly decide it is not worth it. How I am supposed to know what is need or not without reading all that? > > >> Aren't you interested in someone fixing the bug? > > > > Sure or better yet, show me some way to restructure the C code so proper > > asm code is generated. > > You referred to PowerPC patterns in GCC that use the carry > instructions. Those patterns are optimizations for materializing a > truthvalue in a GPR or performance a 64 bit arithmetic operation in 32 > bit mode. The PowerPC port of GCC does not recognize general carry > arithmetic operations yet and track the carry bit. OK, thanks. I know x86 do I had hope there was some way to do that i PowerPC too.
