diff --git a/.gitignore b/.gitignore
index 4a100bb..441e077 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.dSYM
+*.gcda
 *.o
 *.plist
 .deps
diff --git a/pgo.sh b/pgo.sh
new file mode 100755
index 0000000..167db04
--- /dev/null
+++ b/pgo.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+cd "$(dirname "$0")"
+
+make clean
+CFLAGS="$CFLAGS -fprofile-generate"
+./build.sh
+./ag example ..
+make clean
+CFLAGS="$CFLAGS -fprofile-use"
+./build.sh