x86-64 C-Intrinsic reference from MSDN Library:
Mnemonic
Description
C-Intrinsic
Remark
bsf
bit scan forward
_BitScanForward64

bsr
bit scan reverse
_BitScanReverse64

bswap
byte swap
_byteswap_uint64

bt
bit test
_bittest64

btc
bit test and complement
_bittestandcomplement64

btr
bit test and reset
_bittestandreset64

bts
bit test and set
_bittestandset64

cpuid
cpuid
_cpuid
cpuid
imul
signed multiplication
_mulh, _mul128

lzcnt
leading zero count
_lzcnt16, _lzcnt, _lzcnt64
cpuid, SSE4a
mul
unsigned multiplication
_umulh, _umul128

popcnt
population count
_mm_popcnt_u64,
_popcnt16, _popcnt, _popcnt64
cpuid, SSE4.2, SSE4a
rdtsc
read performance counter
_rdtsc

rol, ror
rotate left, right
_rotl, _rotl64, _rotr_rotr64