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diff --git a/scripts/gen_oper.php b/scripts/gen_oper.php
new file mode 100644
index 0000000..e35bc4b
--- /dev/null
+++ b/scripts/gen_oper.php
@@ -0,0 +1,63 @@
+/*******************************************************************************
+ Copyright (c) 2016, Michael Wallner <mike@php.net>.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+     * Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+     * Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*******************************************************************************/
+
+static inline int psi_token_oper_cmp(token_t op1, token_t op2) {
+	switch (op1) {
+<?php
+
+$oper = [
+		["NOT", "TILDE"],
+		["ASTERISK", "SLASH", "MODULO"],
+		["PLUS", "MINUS"],
+		["LSHIFT", "RSHIFT"],
+		["LCHEVR", "CMP_LE", "RCHEVR", "CMP_GE"],
+		["AMPERSAND"],
+		["CMP_EQ", "CMP_NE"],
+		["CARET"],
+		["PIPE"],
+		["AND"],
+		["OR"]
+];
+
+
+foreach ($oper as $prec1 => $ops1) {
+	foreach ($ops1 as $op1) {
+		printf("\tcase PSI_T_%s:\n", $op1);
+		printf("\t\tswitch (op2) {\n");
+		foreach ($oper as $prec2 => $ops2) {
+			foreach ($ops2 as $op2) {
+				printf("\t\t\tcase PSI_T_%s: %sreturn %2d;\n", $op2,
+						str_repeat(" ", 10 - strlen($op2)),
+						$prec1==$prec2?0:($prec1>$prec2?1:-1));
+			}
+		}
+		printf("\t\t}\n\t\tassert(0);\n\t\tbreak;\n");
+	}
+}
+?>
+	}
+	assert(0);
+	return 0;
+}