------- Comment #4 from gael dot guennebaud at gmail dot com 2009-06-24 11:12
-------
some additional info:
- compiling with -fno-strict-aliasing fix the issue, so perhaps this is not a
real bug but a feature ?
- on the other hand using the may_alias type attribute for casting does not
help:
inline __m128 ploadu(const float* from) {
typedef double __attribute__((may_alias)) doubleA;
typedef __m128 __attribute__((may_alias)) __m128A;
__m128 r;
r = (__m128A)(_mm_load_sd( (const doubleA*)(from) ));
r = _mm_loadh_pi(r, (const __m64*)(from+2));
return r;
}
I guess this is because the "const doubleA*" is then casted to a "const
double*" when calling the _mm_load_sd() function.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40537
