https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107299
--- Comment #4 from Aldy Hernandez <aldyh at gcc dot gnu.org> --- (In reply to Aldy Hernandez from comment #3) > We are failing while trying to fold: > > c_92 = __builtin_copysignf128 (0.0, c_80(D)); > > The problem is that c_92 is TFtype but 0.0 is _Float128. TFtype has a > precision of 127 whereas _Float128 has a precision of 128. This causes the > assert in fold_using_range::fold_stmt to fail because range_compatible_p is > false. > > Are both operands of copysign allowed to have different types / precisions? Sorry, what I meant to say is that c_92 is TFtype, whereas __builtin_copysignf128 is assuming to return the type of the first operand (0.0, which is _Float128). Is this correct?
