[Bug c/102989] Implement C2x's n2763 (_BitInt)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102989

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #55592|0                           |1
        is obsolete|                            |

--- Comment #87 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 55596
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55596&action=edit
gcc14-bitint-wip.patch

large/huge _BitInt __builtin_{add,sub}_overflow mostly implemented (I've left 2
spots to finish - gcc_unreachable () - which only trigger rarely).
Though, e.g. in bitint-41.c test still
t113sub
t122mul
t125mul
t127mul
t160sub
t171mul
t174mul
t176mul
functions abort, so to be debugged next week, then ubsan, inline asm and then
hopefully submit.