https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64511
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog,
| |memory-hog
Status|ASSIGNED |NEW
Assignee|rguenth at gcc dot gnu.org |unassigned at gcc dot
gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, nothing I can do about and I can't spot real differences during RTL
expansion. TER gobbles up the whole function though and maybe debug
expression expansion is slightly different (also due to operand
canonicalization).
I note that we don't fold x % x (to preserve the x == 0 exception), a missed
optimization opportunity is to do
if (x == 0)
__builtin_trap ();
at the very first point we encounter that (possibly during VRP if VRP
detects that it can simplify further expressions with x != 0 knowledge).
Note that this bug may be an effective dup of another one.
