Kunal Parmar <[EMAIL PROTECTED]> writes: > I am porting GCC to a new 16 bit RISC architecture which does not have > multiplication and division instructions. I figured that I have to provide > emulation routines for the multiplication and division which will be > inserted into libgcc2.a. But I am confused about which versions of these > routines to provide i.e. do I provide __mulsi3 or __mulhi3 or both.
It depends on UNITS_PER_WORD. If UNITS_PER_WORD is 4, you need __mulsi3. If UNITS_PER_WORD is 2, you need __mulhi3, and, if you have 32-bit integer types, you will also need __mulsi3. In the latter case you can, if you like, get code for __mulsi3 from longlong.h--see the comments at the top of the file. Ian
