[Bug c++/106902] [13/14/15/16 Regression] Program compiled with -O3 -mfma produces different result

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106902

--- Comment #44 from Jason Merrill <jason at gcc dot gnu.org> ---
I certainly support aligning the C++ frontend with C floating point behavior,
whatever that might be.  Is there a C testcase for this issue?