[Bug target/105428] compilation never (?) finishes with __builtin_casinl() and __builtin_csqrtl() with -O -mlong-double-128

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105428

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
What MPC version are you using?  There have been a few fixes for slowness 
in the MPC inverse trigonometric and hyperbolic functions over the years, 
though there may still be scope for substantial further improvements by 
choosing different algorithms for different ranges of inputs.  If you're 
using current MPC then this case should probably be reported to the MPC 
maintainers.