https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116926
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot
gnu.org
Status|NEW |ASSIGNED
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So the problem with r15-4317 is that setting limit_mode == from_mode means
there would be no searching for an optab since `FOR_EACH_MODE (from_mode,
from_mode, limit_mode)` means search from from_mode to limit_mode but NOT
include the limit_mode.
Patch which seems to fix this, will write up a commit message in a little bit:
```
diff --git a/gcc/optabs-query.cc b/gcc/optabs-query.cc
index 65eeb5d8e51..144619bcd86 100644
--- a/gcc/optabs-query.cc
+++ b/gcc/optabs-query.cc
@@ -492,7 +492,10 @@ find_widening_optab_handler_and_mode (optab op,
machine_mode to_mode,
{
gcc_checking_assert (VECTOR_MODE_P (from_mode)
&& GET_MODE_INNER (from_mode) < to_mode);
- limit_mode = from_mode;
+ enum insn_code handler = convert_optab_handler (op, to_mode, from_mode);
+ if (found_mode)
+ *found_mode = from_mode;
+ return handler;
}
else
gcc_checking_assert (GET_MODE_CLASS (from_mode) == GET_MODE_CLASS
(to_mode)
```
