This can not happen because the post-RA optimizer doesn't support sub dword
writes at the moment, but everytime I look at this I wonder if there might
be a bug here.
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22821>
if (op.regClass() == s2 && reg.reg() % 2 != 0)
break;
+ /* Sub dword operands might need updates to SDWA/opsel,
+ * but we only track full register writes at the moment.
+ */
+ assert(op.physReg().byte() == reg.byte());
+
/* If there is only one use (left), recolor the split_vector definition */
if (ctx.uses[op.tempId()] == 1)
def.setFixed(reg);