mirror of
https://github.com/cc65/cc65.git
synced 2025-01-26 17:36:57 +00:00
5db74b4b19
In g_typeadjust, before we apply the integral promotions, we check if both types are unsigned char. If so, we promote to unsigned int, rather than int, which would be chosen by the standard rules. This is only a performance optimization and does not affect correctness, as the flags returned by g_typeadjust are only used for code generation, and not to determine types of other expressions containing this one. All unsigned char bit-patterns are valid as both int and unsigned int and represent the same value, so either signed or unsigned int operations can be used. This special case part is not duplicated by ArithmeticConvert. Partial fix for #1308.
cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools.
cc65 has C and runtime library support for many of the old 6502 machines, including
- the following Commodore machines:
- VIC20
- C16/C116 and Plus/4
- C64
- C128
- CBM 510 (aka P500)
- the 600/700 family
- newer PET machines (not 2001).
- the Apple ][+ and successors.
- the Atari 8-bit machines.
- the Atari 2600 console.
- the Atari 5200 console.
- GEOS for the C64, C128 and Apple //e.
- the Bit Corporation Gamate console.
- the NEC PC-Engine (aka TurboGrafx-16) console.
- the Nintendo Entertainment System (NES) console.
- the Watara Supervision console.
- the VTech Creativision console.
- the Oric Atmos.
- the Oric Telestrat.
- the Lynx console.
- the Ohio Scientific Challenger 1P.
The libraries are fairly portable, so creating a version for other 6502s shouldn't be too much work.