I am maintaining a big code. I cannot upload the case. I found that /od is the reason for the results difference between release mode and debug mode.
In release mode, the compiling option is
/nologo /real_size:64 /module:"x64\Release\\" /object:"x64\Release\\" /libs:static /threads /c
In debug mode, the compiling option is
/nologo /debug:full /Od /gen-interfaces /warn:interfaces /real_size:64 /Qsave /module:"x64\Debug\\" /object:"x64\Debug\\" /traceback /check:bounds /check:uninit /libs:static /threads /dbglibs /c
Our code passed successfully using both compiling options but get different results after many iterations.
When I add /od in release mode, I found that the two results become same.
Can anyone explain why this code optimization option /od introduce the difference?
As a result, I found that the running speed becomes slower. So what coding part I should pay attention or update to remove this difference also running faster.