__builtin_ function link library for vbcc

[matthey]

I have created a new builtin link library for vbcc. It is possible to provide some compatibility with GCC/Clang __builtin_ functions. The following functions are included so far.

__builtin_bswap16(), __builtin_bswap32(), __builtin_bswap64(), __builtin_clz(), __builtin_clzl(), __builtin_clzll(), __builtin_clz16(), __builtin_clz32(), __builtin_clz64(), __builtin_ctz(), builtin_ctzl, __builtin_ctzll(), __builtin_ctz16(), __builtin_ctz32(), __builtin_ctz64(), __builtin_ffs(), __builtin_ffsl(), __builtin_ffsll(), __builtin_ffs16(), __builtin_ffs32(), __builtin_ffs64(), __builtin_parity(), __builtin_parityl(), __builtin_parityll(),__builtin_parity16(), __builtin_parity32(), __builtin_parity64(), __builtin_popcount(), __builtin_popcountl(), __builtin_popcountll(), __builtin_popcount16(), __builtin_popcount32(), __builtin_popcount64()

CPU specific instructions and assembler inlines are used to increase performance when available. I have included builtin.lib for the 68000 and builtin020.lib for the 68020 AmigaOS but build scripts for MorphOS, WarpOS and AmigaOS 4 are provided and CPU assembler inlines for 68k/ColdFire, PPC and x86 (all software builds from the C source are possible also).

Please report bugs, problems and suggestions to this thread. More __builtin_ functions could be added but there are also limitations to an external library. Most of the floating point __builitin_ functions could be added with defines to C99 functions if needed (it is better to change the source to C99 functions in most cases). Customization of the current library is very easy if specific support is needed. The library also provides a simple example of how to create a link library for vbcc. Instructions for installation and usage are in the archive readme. Source is included. Special thanks to Frank Wille for his help.

Edit:
A new beta version has been attached. Changes:

A builtin.h error caused some ctz functions to use clz functions instead.
Documentation improved.
Constant in parity16.c, parity32.c and parity64.c matches datatype.

The builtin.h file in the include directory is the same size as before but has been changed! The only other change is the builtin.readme. All libraries are the same.

[Leffmann]

Thanks!