Hello, I saw in the file fpc/rtl/i386/int64p.inc that the function fpc_mod_qword was disabled with the comment "This does not work correctly". The problem is a bad instruction (presumably a typo): .Lqwordmodr_big_divisior: | | shrdl %cl,%edx,%eax shrl %cl,%edx rorl $1,%edi <-- should be a "roll" divl %ebx movl z,%ebx | | -- mm http://www.ellipsa.net/