INTERNAL ASSEMBLER : Does not know about Internal assembler error: line 4: unhandled mnemonic: RDRAND [RDRAND RAX]

[Schmitty2005]

Working on a simple random number generator, I ran across this issue.

procedure GetHardwareRandom64 {: UInt64}; {$IFDEF BLAISE}assembler; nostackframe;{$ENDIF}
{var
  Value: UInt64;
  Success: Byte;}
{$asmmode intel}  //FPC Defaults to AT&T asm syntax
{$IFNDEF BLAISE}
begin{$ENDIF}
  asm
    RDRAND RAX
    SETC   AL
    MOV    Success, AL
    MOV    RandSeed64, RAX //Value, RAX
  end;

      asm
      RDTSC     //<<Blaise internal assembler does not know this either
      SHL RDX, 32
      OR  RDX, RAX
      MOV Value, RDX
    end;