P(rcx int64) Struct(size: 12)
P(rdx int64) Struct(size: 12)
P(r8 int64) Struct(size: 12)
P(r9 int64) Struct(size: 12)
P(S+0 int64) Struct(size: 12)
P(S+8 int64) Struct(size: 12)
=>
rax int64