this is compiler's... ansi says that bitfields (:1) should be compared as signed. so, if this declared unsigned, a long ;) procedure to convert unsigned to signed involved.
~d On Wednesday 27 August 2003 15:33, Ralf Guetlein wrote: > But why? Is there a restriction (ANSI) or is it just a compiler weakness? > To my understanding, if you have a single-bit field, there should be no > room for interpretation, esp. when you compare to 0, so a > > if (s.field) [...] > > should lead to the same code, whether signed or not. > > Ralf > > > "Dmitry" <di...@mail.ru> schrieb im Newsbeitrag > news:200308271414.54269.di...@mail.ru... > > no.. > this mostly applies to a single bit operand like ...{int a1:,...}; > ~d > > I'd like to understand this suggestion a bit more, as if I want to store 0, > > > 1, 2, or 3 in a bitfield, it seems like you are suggesting that I should > > use 3 bits instead of the expected 2 bits that would be required in an > > unsigned bit field. What can be done to make msp430-gcc to generate > > better > > > code for the unsigned integer bit field also? > > - > /***************************************************************** > ("`-''-/").___..--''"`-._ (\ Dimmy the Wild UA1ACZ > `6_ 6 ) `-. ( ).`-.__.`) State Polytechnical Univ. > (_Y_.)' ._ ) `._ `. ``-..-' Radio-Physics Departament > _..`--'_..-_/ /--'_.' ,' Saint Petersburg, Russia > (il),-'' (li),' ((!.-' +7 (812) 5403923, 5585314 > *****************************************************************/ > > > > ------------------------------------------------------- > This sf.net email is sponsored by:ThinkGeek > Welcome to geek heaven. > http://thinkgeek.com/sf > > > > > > ------------------------------------------------------- > This sf.net email is sponsored by:ThinkGeek > Welcome to geek heaven. > http://thinkgeek.com/sf > _______________________________________________ > Mspgcc-users mailing list > Mspgcc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mspgcc-users -- /***************************************************************** ("`-''-/").___..--''"`-._ (\ Dimmy the Wild UA1ACZ `6_ 6 ) `-. ( ).`-.__.`) State Polytechnical Univ. (_Y_.)' ._ ) `._ `. ``-..-' Radio-Physics Departament _..`--'_..-_/ /--'_.' ,' Saint Petersburg, Russia (il),-'' (li),' ((!.-' +7 (812) 5403923, 5585314 *****************************************************************/
