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 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. >> 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. Thanks, David
