https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79487
--- Comment #14 from Dominik Vogt <vogt at linux dot vnet.ibm.com> --- To me, it looks like the same bug does not happen with float just because there is no need to convert this to 64 bit format for the comparison. simplify_const_unary_operation is not executed - if it was the same would have happened for the float to double conversion.
