Push and Pop on AMD64 [duplicate]

Question

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• Does each PUSH instruction push a multiple of 8 bytes on x64? 2 answers

What is the equivilent of pushl %ecx and popl %ecx on a AMD64 sytem, My results are Error: invalid instruction suffix for 'push' I have had a look and some one suggested changing ecx to rcx but that just resulted in Incorrect register '%rcx' used with 'l' suffix

Thanks for your help.

Answer 1

On AMD64, push and pop operations are implicitly 64-bits and have no 32-bit counterparts. Try:

pushq %rcx
popq %rcx

See here for details.