diff options
Diffstat (limited to 'NOTES.txt')
-rw-r--r-- | NOTES.txt | 26 |
1 files changed, 0 insertions, 26 deletions
@@ -28,32 +28,6 @@ Extensions: //===---------------------------------------------------------------------===// -When we go to reimplement <tgmath.h>, we should do it more intelligently than -the GCC-supplied header. EDG has an interesting __generic builtin that provides -overloading for C: -http://www.edg.com/docs/edg_cpp.pdf - -For example, they have: - #define sin(x) __generic(x,,, sin, sinf, sinl, csin, csinf,csinl)(x) - -It's unclear to me why you couldn't just have a builtin like: - __builtin_overload(1, arg1, impl1, impl2, impl3) - __builtin_overload(2, arg1, arg2, impl1, impl2, impl3) - __builtin_overload(3, arg1, arg2, arg3, impl1, impl2, impl3) - -Where the compiler would just pick the right "impl" based on the arguments -provided. One nasty detail is that some arithmetic promotions most be done for -use by the tgmath.h stuff, but it would be nice to be able to handle vectors -etc as well without huge globs of macros. With the above scheme, you could -use: - - #define sin(x) __builtin_overload(1, x, sin, sinf, sinl, csin, csinf,csinl)(x) - -and not need to keep track of which argument to "__generic" corresponds to which -type, etc. - -//===---------------------------------------------------------------------===// - To time GCC preprocessing speed without output, use: "time gcc -MM file" This is similar to -Eonly. |