"iret" and "iretd"!

[mzlai at 263.net (mzlai at 263.net)]

Hi,
       When I wrote a ISP(Interrupt Servise Procedure) with the i386,
I used a instruction "iretd" the end of the procedure.But when i compiled it with "gcc",the compiler said that there's any instruction
like the "iretd" in the i386 instruction set.
      So, I wanted to use another instruction "iret",but It does not worded as what I expected!
      I want to know what's the different between this two instructions
--"iret" and "iretd",and which one can be used within the gcc compiling!
     I will be very appreciated for any help!Thank you!

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