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diff --git a/tools/performance-log-coalesce.py b/tools/performance-log-coalesce.py
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+#!/usr/bin/env python3
+
+"""
+performance-log-coalesce.py -- Coalesce GIMP performance log symbols, by
+ filling-in missing base addresses
+Copyright (C) 2018 Ell
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+
+Usage: performance-log-coalesce.py < infile > outfile
+"""
+
+from xml.etree import ElementTree
+import sys
+
+empty_element = ElementTree.Element ("")
+
+# Read performance log from STDIN
+log = ElementTree.fromstring (sys.stdin.buffer.read ())
+
+address_map = log.find ("address-map")
+
+if address_map:
+ addresses = []
+
+ # Create base addresses dictionary
+ base_addresses = {}
+
+ for address in address_map.iterfind ("address"):
+ symbol = address.find ("symbol").text
+ source = address.find ("source").text
+ base = address.find ("base").text
+
+ if symbol and source and not base:
+ key = (symbol, source)
+ value = int (address.get ("value"), 0)
+
+ base_addresses[key] = min (value, base_addresses.get (key, value))
+
+ addresses.append (address)
+
+ # Fill-in missing base addresses
+ for address in addresses:
+ symbol = address.find ("symbol").text
+ source = address.find ("source").text
+
+ address.find ("base").text = hex (base_addresses[(symbol, source)])
+
+# Write performance log to STDOUT
+sys.stdout.buffer.write (ElementTree.tostring (log))