[Bug target/96793] __builtin_floor produces wrong result when rounding direction is FE_DOWNWARD

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96793

--- Comment #11 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 49146
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49146&action=edit
Testcase, suitable for gcc testsuite