[Bug tree-optimization/88074] [7/8/9 Regression] g++ hangs on math expression

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88074

--- Comment #23 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
And, yes, at least one extra bit in emin is needed for that sticky 
rounding code to work (because the user's source code may have a decimal 
constant that is slightly over half the least subnormal, and mpfr_strtofr 
needs to return a nonzero value for that code to work, meaning a value 
whose exponent is one smaller than the smallest exponent of any subnormal 
value that is actually representable in the floating-point format).