add 4 bytes of padding for stack alignment, as suggested by David.
mov \sel(%esp), %ecx
lea \receiver(%esp), %eax
+ push %ecx # Unused, stack alignment
push %ecx # _cmd
push %eax # &self
- .cfi_def_cfa_offset 12
+ .cfi_def_cfa_offset 16
call CDECL(slowMsgLookup)@PLT
- add $8, %esp # restore the stack
+ add $12, %esp # restore the stack
#ifdef _WIN32
