[Bug target/81906] [7/8 Regression] Calls to rint() wrongly optimized away starting in g++ 6

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81906

--- Comment #11 from joseph at codesourcery dot com <joseph at codesourcery dot 
com> ---
(That's essentially what the generic C implementation of rint in glibc 
does.  I make no assertions about whether inlining this long expansion of 
rint for SSE, or even the shorter -fno-rounding-math version, actually 
makes sense.)