How does conditional jump of x86-64 works?

How does conditional jump of x86-64 works?



I'm so confused about conditional branch while I was studying x86-64.


compq %rax,%rdi
jl .L2



Which one is the correct understanding?




1 Answer
1



There's no compq in x86-64. There's CMP which will be cmpq when comparing 64-bit operands in AT&T syntax.


compq


cmpq



It'll be clearer when using Intel syntax, because AT&T swaps the destination and source which will be more confusing on instructions like cmp and sub


cmp


sub


cmp rdi, rax
jl .L2



Jcc instructions always compare the first operand with the second one. In this case it'll jump when rdi < rax






This will jump when (long int)rax < (long int)rdi.

– Aki Suihkonen
Sep 16 '18 at 14:13


(long int)rax < (long int)rdi



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