https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66369
--- Comment #9 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Marcus Kool from comment #8)
> Can you confirm that the code has
> return __builtin_ctzl(v);
__inline__ long find_pos32( unsigned char ch, mycharset32 set )
{
__m256i regchx256;
__m256i regset256;
long v;
regchx256 = _mm256_set1_epi8( ch );
regset256 = _mm256_loadu_si256( (__m256i const *) set );
v = (unsigned int) _mm256_movemask_epi8(
_mm256_cmpeq_epi8(regchx256,regset256) );
if (v != 0L)
return (long) __builtin_ctzl( v );
return -1;
}
> Thanks for the patch, but the required cast to unsigned int is
> counter-intuitive and it is likely that nobody will use this cast in their
> code and hence miss the optimisation. Isn't there a more elegant solution?
No.
