[Bug rtl-optimization/64294] invalid code, zero check gets optimized away

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64294

--- Comment #7 from Mikael Pettersson <mikpelinux at gmail dot com> ---
The testcases don't build due to linkage errors.  Please submit a
self-contained and preferably minimized testcase.