[Bug tree-optimization/113459] ICE: in as_a, at machmode.h:381 with memset() on a _BitInt() at -O1 and above

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113459

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|rguenth at gcc dot gnu.org         |unassigned at gcc dot 
gnu.org
             Status|ASSIGNED                    |NEW
                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
              unsigned buflen = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (vr->type)) +
1;
              if (INTEGRAL_TYPE_P (vr->type))
                buflen = GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (vr->type)) + 1;

there's other spots using the pattern

                      if (INTEGRAL_TYPE_P (type))
                        sz = GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type));

I wonder when GET_MODE_SIZE differs from TYPE_SIZE_UNIT?  PSImode?
Packed bitfields?  r10-6885-g5f9cd512c42786 added the INTEGRAL_TYPE_P
special-casing we now run into with the TYPE_SIZE_UNIT code being there
before.

Jakub, do you remember?