Merge pull request f4pga#1483 from antmicro/fix_xpath

Allow import scripts to parse huge .net files

utils/vpr_io_place.py

@@ -56,9 +56,11 @@ def load_block_names_from_net_file(self, net_file):
         net_root = net_xml.getroot()
         self.net_to_block = {}
 
-        for block in net_root.xpath(
-                "//block[@instance='inpad[0]'] | //block[@instance='outpad[0]']"
-        ):
+        for block in net_root.xpath("//block"):
+            instance = block.attrib["instance"]
+            if instance != "inpad[0]" and instance != "outpad[0]":
+                continue
+
             top_block = block.getparent()
             assert top_block is not None
             while top_block.getparent() is not net_root:

utils/vpr_place_constraints.py

@@ -45,7 +45,11 @@ def load_loc_sites_from_net_file(self, net_file):
                 self.block_to_root_block[el.attrib['name']
                                          ] = root_block.attrib['name']
 
-        for attr in net_root.xpath("//attribute[@name='LOC']"):
+        for attr in net_root.xpath("//attribute"):
+            name = attr.attrib["name"]
+            if name != 'LOC':
+                continue
+
             # Get block name
             top_block = attr.getparent()
             assert top_block is not None