https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86160
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- Generic (for some floating-point formats, and maybe not for 128-bit formats on 32-bit targets) bit-pattern is* were implemented by Tamar Christina's patches that had to be reverted as they broke some powerpc configurations. See bug 66462 - when versions based on integer arithmetic are available they should be used in place of ones based on floating-point arithmetic for -fsignaling-nans, regardless of which is more efficient on a given processor, since is* aren't meant to raise "invalid" for signaling NaN arguments but all comparisons do.
