PGO with slightly different source code than was used to generate profiles

[gregfi04]

I'm in the final stages of testing a code, and I found typos in a couple of the error messages. Can I just do a recompile with PGO using the old profiles, or do I need to regenerate the profile data?

Thanks,

Greg

[Steven_L_Intel1 · Accepted solution]

If you just changed the text of a character string, you won't need to redo the profiles. But if you change the logic of the program, you would.

[gregfi04]

Great, thanks. If logic were changed, would the compiler be smart enough to detect a mismatch? If not, could it potentially cause problems?

[Steven_L_Intel1]

It might, if the number of "basic blocks" of code paths changed. If it didn't, the results could mislead the compiler into making optimization choices it shouldn't.