LShiftU64.c

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UINT64
EFIAPI
InternalMathLShiftU64 (
  IN      UINT64  Operand,
  IN      UINTN   Count
  )
{
  _asm {
    mov     cl, byte ptr [Count]
    xor     eax, eax
    mov     edx, dword ptr [Operand + 0]
    test    cl, 32                      // Count >= 32?
    jnz     L0
    mov     eax, edx
    mov     edx, dword ptr [Operand + 4]
L0:
    shld    edx, eax, cl
    shl     eax, cl
  }
}