Re: __builtin_ia32_loadaps not available(?)

[Ian Lance Taylor <iant at google dot com>]

Thomas Zimmermann <kuhundbaer@web.de> writes:

> I have a question regarding SIMD built-ins.
>
> The built-in '__builtin_ia32_loadaps' is mentioned in the GCC manual,
> but seems unavailable. Code like
>
> <quote>
> int
> main(int argc, char **argv)
> {
>   float  __attribute__((aligned(16))) f[4] = {1, 1, 1, 1};
>
>   v4sf v;
>   v = __builtin_ia32_loadaps(f);
>
>   exit(EXIT_SUCCESS);
> }
> </quote>
>
> results in an error message
>
> <quote>
> gcc -D_GNU_SOURCE=1 -Wall -march=core2 -m64 -mmmx -msse -msse2 -O2 -c -o
> main.o main.c
> main.c: In function âmainâ:
> main.c:13: warning: implicit declaration of function
> â__builtin_ia32_loadapsâ
> main.c:13: error: incompatible types when assigning to type âv4sfâ from
> type âintâ
> make: *** [main.o] Fehler 1
> </quote>
>
> However, the same code with the built-in '__builtin_ia32_loadups'
> works. 
>
> I've seen this with GCC 4.4 and 4.6. What am I doing wrong?

I recommend using the Intel-define intrinsics from <xmmintrin.h>
instead.

The __builtin_ia32_loadaps builtin function was removed and the
documentation is out of date.  The movaps instruction from memory is
easily generated using code like

#include <xmmintrin.h>
__m128
f (__m128 *p)
{
  return *p; 
}

This is another instance of http://gcc.gnu.org/PR20049 .

Ian