pan/bi: Add "lane_dest" modifier

Similar to the "lane" modifier, but for the instruction destination
instead the sources.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10392>

src/panfrost/bifrost/bi_builder.h.py

@@ -19,7 +19,7 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
-SKIP = set(["lane", "lanes", "lanes", "replicate", "swz", "widen", "swap", "neg", "abs", "not", "sign", "extend", "divzero", "clamp", "sem", "not_result", "skip"])
+SKIP = set(["lane", "lane_dest", "lanes", "lanes", "replicate", "swz", "widen", "swap", "neg", "abs", "not", "sign", "extend", "divzero", "clamp", "sem", "not_result", "skip"])
 
 TEMPLATE = """
 #ifndef _BI_BUILDER_H_

src/panfrost/bifrost/bi_packer.c.py

@@ -107,6 +107,9 @@ def pack_modifier(mod, width, default, opts, body, pack_exprs):
         # Construct a list
         lists = [pick_from_bucket(opts, bucket) for bucket in SWIZZLE_BUCKETS]
         ir_value = "src[{}].swizzle".format(arg)
+    elif raw == "lane_dest":
+        lists = [pick_from_bucket(opts, bucket) for bucket in SWIZZLE_BUCKETS]
+        ir_value = "dest->swizzle"
     elif raw in ["abs", "sign"]:
         ir_value = "src[{}].abs".format(arg)
     elif raw in ["neg", "not"]:

src/panfrost/bifrost/bi_printer.c.py

@@ -129,11 +129,13 @@ bi_${mod}_as_str(enum bi_${mod} ${mod})
 
 <%def name="print_modifiers(mods, table)">
     % for mod in mods:
+    % if mod not in ["lane_dest"]:
     % if len(table[mod]) > 2:
         fputs(bi_${mod}_as_str(I->${mod}), fp);
     % else:
         if (I->${mod}) fputs(".${mod}", fp);
     % endif
+    % endif
     % endfor
 </%def>