Replacing the x86 rep Assembly Instruction

Symptom

Error: unknown mnemonic 'rep' -- 'rep'

Possible Cause

rep is an x86 instruction used to repeat an execution. It needs to be replaced with the rept instruction of the ARM64.

Procedure

Modify the code as follows:

• Example code on the x86 platform:

  #define nop __asm__ __volatile__("rep;nop": : :"memory")

• The following is a code example on the Kunpeng platform. In this example, an empty instruction is implemented, and the parameter n indicates the number of cycles.

  #define __nops(n) ".rept " #n "\nnop\n.endr\n"

  #define nops(n) asm volatile(__nops(n))