The llvm.x86.avx512.mask.cvtpd2dq.512 intrinsic; known as __builtin_ia32_cvtpd2dq512_mask in GCC.
See Implementation
The llvm.x86.avx512.mask.cvtpd2dq.512 intrinsic; known as __builtin_ia32_cvtpd2dq512_mask in GCC.