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cmath call builtin sqrtf but many platforms seem miss that(was Re: lrint lrintf problems )
- From: Bernd Roesch <nospamname at web dot de>
- To: Richard Guenther <richard dot guenther at gmail dot com>, gcc at gcc dot gnu dot org
- Date: Mon, 09 Mar 2009 10:42:12 +0200
- Subject: cmath call builtin sqrtf but many platforms seem miss that(was Re: lrint lrintf problems )
Hello Richard
On 06.03.09, you wrote:
ah thanks for info, i understand now too wy sqrtf, fmod (work in C programs)
get linker error on C++ programs but sqrt and some other work on platform
68k.
in c++/4.3.2/cmath include
is this code.
using ::sqrt;
inline float
sqrt(float __x)
{ return __builtin_sqrtf(__x); }
But .md file of many architetures contain no entry for this.I see only i386,
rs6000, ia64, sh contain code for this.(I search for sqrtf and list files
that contain this)
the header files are build during GCC build, i change nothing.
Is there something wrong during compiler Build process ?
>>
>> How can i then implement lrint func without asm Code ?
>
> If the backend does not support inlining lrint then you need to link
> against a C99 math library (-lm). You can add lrint<srcmode><destmode>
> patterns to m68k.md to provide inline expansions.
>
> Richard.
>
>> please help
>>
>>
Regards