[haiku-development] Re: GCI task regarding <math.h>
- From: Ingo Weinhold <ingo_weinhold@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Mon, 20 Dec 2010 01:03:58 +0100
On 2010-12-19 at 23:33:11 [+0100], scott mc <scottmc2@xxxxxxxxx> wrote:
> Thanks for the reply. Another thing relating to this, should we use:
> #define isgreater(x, y) __builtin_isgreater ((x),(y))
> #define isgreaterequal(x, y) __builtin_isgreaterequal ((x),(y))
> #define isless(x, y) __builtin_isless ((x),(y))
> #define islessequal(x, y) __builtin_islessequal ((x),(y))
> #define islessgreater(x, y) __builtin_islessgreater ((x),(y))
> #define isunordered(x, y) __builtin_isunordered ((x),(y))
>
> or does Haiku not have these __builtin_ functions? Are those
> dependent on the CPU arch and/or gcc version?
__builtin_*() functions are provided by the compiler. The availability of
built-in functions can be architecture dependent, though I doubt that this
is the case for the ones above. Generally gcc 2.95.3 has a lot less
built-ins than current versions, though it's possible certain built-ins have
been deprecated or removed in the meantime. Check the gcc documentation
and/or test to be sure what works.
CU, Ingo
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