https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120115
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2025-05-05
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Keywords| |ice-on-valid-code
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. You can possibly arrive here with --param adjustments as well?
The issue is we're using 'unsinged int' for vector lengths and
/* Get table of labels to jump to, in order of case index. */
ncases = tree_to_shwi (range) + 1;
labelvec.safe_grow_cleared (ncases);
get's us a negative ncases (ncases is 'int', but tree_to_shwi produces
HOST_WIDE_INT aka int64_t). vec::embedded_size does not handle overflow
(aka trip on it):
return sizeof (vec_stdlayout) + alloc * sizeof (T);
and the issue with disabling switch-conversion is that the switch()
expansion then unconditionally is an uncompressed tablejump.
When we arrive here, on a 32bit host, the only way out is sorry ().
