[Bug c++/70925] Vectorized loop segfaults: read exceeds vector boundary

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70925

--- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Quote from http://gcc.gnu.org/bugs/:

»Before reporting that GCC compiles your code incorrectly, compile it with gcc
-Wall -Wextra and see whether this shows anything wrong with your code.
Similarly, if compiling with -fno-strict-aliasing -fwrapv
-fno-aggressive-loop-optimizations makes a difference, or if compiling with
-fsanitize=undefined produces any run-time errors, then your code is probably
not correct.«

-fsanitize=undefined will point out these issues.