I'd need to see the types involved to determine whether this is a bug; if both advalue and cfg.ref_mv are 16-bit values, I suspect the compiler is correct in ignoring the upper 16 bit result. (Try casting one or the other to a long int.)
If that doesn't resolve it, please provide a complete function definition that exhibits the problem in a tracker ticket so this can be addressed. https://sourceforge.net/tracker/?group_id=42303&atid=432701 You can use -mmpy=none to disable code generation for hardware multiply if there is a compiler problem. Peter On Sun, Feb 19, 2012 at 1:43 PM, Miloslav Semler <maj...@prepere.com> wrote: > Hello, > I have some problem with msp-gcc (version 4.6.1, mspgcc-20111224). When > I try to generate assembly code from this lines bellow: > > x = advalue * cfg.ref_mv; > point = div32768(x); > > it produces something like that: > > mov r15, &__MPYS > mov &cfg+20, &__OP2 > mov &__RESLO, r14 > pop r2 > mov r14, r15 > swpb r15 > sxt r15 > swpb r15 > sxt r15 > call #div32768 > > Which is wrong for me as it discards high word from result (RESHI is not > copied, instead it is used an sign extension). Routine div32768 accepts > 32bit signed integer. > > Is there any switch for compiler to avoid this problem? > > > -- Miloslav > > > ------------------------------------------------------------------------------ > Virtualization & Cloud Management Using Capacity Planning > Cloud computing makes use of virtualization - but cloud computing > also focuses on allowing computing to be delivered as a service. > http://www.accelacomm.com/jaw/sfnl/114/51521223/ > _______________________________________________ > Mspgcc-users mailing list > Mspgcc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mspgcc-users ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Mspgcc-users mailing list Mspgcc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mspgcc-users
