071-ppips: generate hints for nodes with multiple uphill pips

Signed-off-by: Hans Baier <[email protected]>

Author: hansfbaier

fuzzers/071-ppips/generate.tcl

@@ -131,11 +131,19 @@ proc write_ioi_ppips_db {filename tile} {
 
     foreach pip [get_pips -of_objects $tile] {
         set dst_wire [get_wires -downhill -of_objects $pip]
+        set nodes [get_nodes -of_objects $dst_wire]
+        set uphill_pips [get_pips -uphill -of_objects $nodes]
+
         if [string match "*DATAOUT*" $dst_wire] {
             continue
-        } elseif {[get_pips -uphill -of_objects [get_nodes -of_objects $dst_wire]] == $pip} {
+        } elseif {$uphill_pips == $pip} {
+            # if there is only one uphill pip, then output always
             set src_wire [get_wires -uphill -of_objects $pip]
             puts $fp "${tile_type}.[regsub {.*/} $dst_wire ""].[regsub {.*/} $src_wire ""] always"
+        } elseif {[lsearch -exact $uphill_pips $pip]} {
+            # if there are multiple uphill pips, output a hint
+            set src_wire [get_wires -uphill -of_objects $pip]
+            puts $fp "${tile_type}.[regsub {.*/} $dst_wire ""].[regsub {.*/} $src_wire ""] hint"
         }
     }