On Mon, Nov 06, 2006 at 10:52:00AM +0530, Mohamed Shafi wrote: > Hello all, > > Looking at a .md file of a backend it there a way to know whether a > target supports long long > Should i look for patterns with machine mode DI?
No. For example, 8-bit, 16-bit and 32-bit targets should normally not define patterns such as anddi3, iordi3 and xordi3. It is possible that a target could have no patterns with mode DI but still support long long, although probably with significant slowdown. E.g. the middle end can synthesize adddi3 and subdi3 from SImode operations, but I think most targets can easily improve 10x in terms of speed and size on that code. Watch out for targets where units are larger than 8 bits. An example is the c4x where a unit is 32-bits and HImode is 64-bits. > Is there some other way? This depends a lot on exactly what you mean when you say support, but grep for LONG_TYPE_SIZE and LONG_LONG_TYPE_SIZE in the .h file and compare the two. -- Rask Ingemann Lambertsen
