Using AVX intrinsics with LDC

[Jeff]

Hello,
I'm a beginner in D (I come from C++/Python), but I'm having 
great fun learning the language reading Ali's book. I'm using LDC 
as compiler, and I would like to use intrinsics, but I have 
difficulties to find the Intel intrinsics equivalent. Here are 
the functions I'm looking for :

_mm_cvtsi64x_si128
_mm256_sll_epi64
_mm256_movemask_epi8

Is there a way to call them ? Is there an Intel intrinsics to LDC 
intrinsics guide somewhere ?
Thanks for your help !