Re: Problem involved porting LCC to a 8 bit microcontroller

amker.cheng@gmail.com wrote:
> Just a student project !Porting porting LCC to a 8 bit microcontroller
> with which char is 8 bit and int is 16bit.
> But I found in LCC character and short-integer actual arguments are
> always promoted to the coresponding type even in the presence of a
> prototype!(And does there any place in it did similar thing?)
> So I have to use 2 8bit regsters for a char type argument!This is
> unbearable here!
> I want to change the front end, but not sure. All I have to do is
> change codes for function declarations and definitions in decl.c?
> Further more , in arithmetric computing "char c1,c2; c1 = c1 + c2;"
> does lcc promote char into int? I doubt of it because there isn't an
> dag operator for ADDI1!


That's because in C all arithmetic (and argument passing) uses promoted
values. You can find some notes on a solution here
http://www.homebrewcpu.com/retargeting_lcc.htm
Searching past posts in this newsgroup may also help.


lcc's most comfortable on modern 32-bit architectures; it can be
awkward outside this sweet spot.

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