[Bug target/63312] FAIL: gcc.dg/torture/float128-exact-underflow.c -O0 execution test

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63312

--- Comment #1 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Created attachment 33519
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33519&action=edit
Untested patch

Please try this patch.  As I noted in my patch posting, the issue is that there
is no ia64 definition of FP_TRAPPING_EXCEPTIONS.