[Bug rtl-optimization/72488] [7 Regression] wrong code (SIGFPE) at -Os and above on x86_64-linux-gnu (in the 64-bit mode)

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72488

--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
I've got a solid theory here.  But it's too late to test and write up.