xorq: Error: suffix or operands invalid for `xor'

[Tsus86]

Hi everyone,
i have a problem with "xorq" in x86-64 bits when compiling an assembly code.

When i put this instruction: "" xorq $17179869184, %rax ""
i get this error when compiling: Error: suffix or operands invalid for `xor'

however if i put a number smaller than 2^31 (2147483648), the compilation is successful.

can anyone please tell me how to fix this problem?
I'm using gcc.

Thanks

[anduril462]

The following site (read the "Immediates" section) seems to suggest that immediate values in x86-64 still have to be 32-bits:AMD64 Subpage

To do what you want, I think you have to move the 64-bit immediate into a register first:

movabsq $17179869184, %rbx
xorq $rbx, %rax

[Tsus86]

Thank you for your reply. Yes its seems that one should put the value into a register then execute xorq since they are considered as 32 bits