2016-05-04 4:59 GMT+02:00 Vittorio Giovara <vittorio.giov...@gmail.com>: >> #if GNU_SOMETHING >> >> #define bitstream_read(ctx, len) \ >> (__builtin_constant_p(len) ? ((len) < 0 ? barf() : \ >> (len) == 0 ? 0 : \ >> (len) == 1 ? bitstream_read_bit(ctx) : \ >> (len) < 32 ? bitstream_read_32((ctx), (len)) >> : \ >> (len) < 64 ? bitstream_read_63((ctx), (len)) >> : \ >> barf()) : \ >> bitstream_read_63((ctx), (len))) >> >> #else >> >> #define bitstream_read(ctx, len) bitstream_read_63((ctx), (len)) >> >> #endif >> >> ? >> >> Cases where performance is very important can choose the correct inner >> function as appropriate. Everyone else will usually get the right one >> anyway, and not have to be careful about the internals and exactly how wide >> things are. >> >> (Also maybe something microsofty as another variant, I don't know how that >> works.) > > I like this idea very very much.
Absolutely. Except I fear only gcc and clang support it or an equivalent. -- Christophe _______________________________________________ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
