https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79373
--- Comment #2 from Steven Pigeon <steven.p.pigeon at gmail dot com> --- (In reply to Andrew Pinski from comment #1) > I am suspecting this: > t*=65793; > > overflows. > > Can you try with -fsanitize=undefined ? The bug disappears with g++ -fsanitize=undefined -O3 -std=c++11 test-wave-stream.cpp Yes, it overflows for some values (and is undefined behavior?). But it shouldn't affect the for-loop. At worse, the returned values should be random-looking and the unit test should fail with a message.
