[GAS] x86_64 gas doesn't recognize movzx r64,r/m32 (intel notaion)

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Hello!

  I have such environment:

        GNU assembler 2.17

        This assembler was configured for a

            target of `x86_64-pc-linux-gnu'.

        gcc (GCC) 4.1.1 (Gentoo 4.1.1-r3)



  This example won't compile for me (main.S):

        .intel_syntax noprefix



        .text

        .globl main

                .type main, @function

        main:

                movzx rax, eax

                movzx rax, dword ptr [eip]

compiling...$ cc    -c -o main.o main.S



main.S: Assembler messages:

main.S:7: Error: suffix or operands invalid for `movzx'

main.S:8: Error: suffix or operands invalid for `movzx'



Is it known bug/feature?



Thanks!