https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110169
--- Comment #3 from CTC <19373742 at buaa dot edu.cn> --- (In reply to Alexander Monakov from comment #2) > It seems csmith was run with the --float argument. Differences under -Ofast > are expected (but even without -Ofast, it seems csmith can emit bit > manipulation of arbitrary floats, which can lead to unpredictable results > when NaNs are involved). It's true that I ran csmith with '--float --paranoid'. Sorry for the misreport.