#objdump: -dwMsuffix #name: x86-64 rep prefix (with suffixes) .*: +file format .* Disassembly of section .text: 0+000 <_start>: 0: f3 ac[ ]+rep lodsb %ds:\(%rsi\),%al 2: f3 aa[ ]+rep stosb %al,%es:\(%rdi\) 4: 66 f3 ad[ ]+rep lodsw %ds:\(%rsi\),%ax 7: 66 f3 ab[ ]+rep stosw %ax,%es:\(%rdi\) a: f3 ad[ ]+rep lodsl %ds:\(%rsi\),%eax c: f3 ab[ ]+rep stosl %eax,%es:\(%rdi\) e: f3 48 ad[ ]+rep lodsq %ds:\(%rsi\),%rax 11: f3 48 ab[ ]+rep stosq %rax,%es:\(%rdi\) #pass