14. int (16 bit) and long (32 bit ) support.

For signed & unsigned int (16 bit) and long (32 bit) variables, division, multiplication and modulus operations are implemented by support routines. These support routines are all developed in ANSI-C to facilitate porting to other MCUs. The following files contain the described routine, all of them can be found in the directory SDCCDIR/sdcc51lib

• _mulsint.c - signed 16 bit multiplication (calls _muluint)
• _muluint.c - unsigned 16 bit multiplication
• _divsint.c - signed 16 bit division (calls _divuint)
• _divuint.c - unsigned 16 bit division.
• _modsint.c - signed 16 bit modulus (call _moduint)
• _moduint.c - unsigned 16 bit modulus.
• _mulslong.c - signed 32 bit multiplication (calls _mululong)
• _mululong.c - unsigned32 bit multiplication.
• _divslong.c - signed 32 division (calls _divulong)
• _divulong.c - unsigned 32 division.
• _modslong.c - signed 32 bit modulus (calls _modulong).
• _modulong.c - unsigned 32 bit modulus.

All these routines are compiled as non-reentrant and small model. Since they are compiled as non-reentrant, interrupt service routines should not do any of the above operations, if this unavoidable then the above routines will need to ne compiled with the --stack-auto option, after which the source program will have to be compiled with --int-long-rent option.