Re: [MiNT] Newest GCC + Binutils compile status

[Vincent Rivière <vincent.riviere@freesbee.fr>]

MiKRO wrote:
> I took a look into netbsd's libm -- it's based on fdlibm as you guessed 
> but it's made much more intelligent than sparemint's one. on netbsd 
> there are three targets, m68k, m68881 and m68060 and each target 
> contains math functions for each FPU -- i.e. m68k has none, so 
> everything is built (emulated functions in C), m68881 has sin function 
> so it's just wrapper to fsin instruction, m68060 hasn't sinf but it's 
> wrapped to 060 FPSP by motorola.

Good !

Note that GCC itself has the notion of "builtin functions". For some 
well-known functions (including math), GCC do not actually call the 
functions, it simply replaces the well-known function call by the 
precomputed result. When the function arguments are not constant, and 
when it is possible, GCC tries to replace the function call with an FPU 
call (for example, fabs() inside libm.a is never called, the FPU 
instuction "fabs" is always used instead).

A similar optimization occurs with printf("foo\n").
GCC actually calls puts("foo") !

--
Vincent Rivière