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diff --git a/gmp/mpn/m68k/t-m68k-defs.pl b/gmp/mpn/m68k/t-m68k-defs.pl
new file mode 100644
index 00000000..226afc54
--- /dev/null
+++ b/gmp/mpn/m68k/t-m68k-defs.pl
@@ -0,0 +1,80 @@
+#! /usr/bin/perl -w
+
+# Copyright 2001, 2003 Free Software Foundation, Inc.
+#
+# This file is part of the GNU MP Library.
+#
+# The GNU MP Library is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or (at your
+# option) any later version.
+#
+# The GNU MP Library 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 Lesser General Public
+# License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.
+
+
+# Usage:  perl t-m68k-defs.pl [-t]
+#
+# Run this in the mpn/m68k source directory to check that m68k-defs.m4 has
+# m68k_defbranch()s or m68k_definsn()s for each instruction used in *.asm
+# and */*.asm.  Print nothing if everything is ok.  The -t option prints
+# some diagnostic traces.
+
+use strict;
+use Getopt::Std;
+
+my %opt;
+getopts('t', \%opt);
+
+my %branch;
+my %insn;
+
+open(FD, "<m68k-defs.m4")
+    or die "Cannot open m68k-defs.m4: $!\nIs this the mpn/m68k source directory?\n";
+my ($srcdir, $top_srcdir);
+while (<FD>) {
+    if (/^m68k_defbranch\(\s*(.*)\)/) { $branch{"b".$1} = 1; }
+    if (/^m68k_definsn\(\s*(.*),\s*(.*)\)/) { $insn{$1.$2} = 1; }
+}
+close(FD);
+
+print "branches: ", join(" ",keys(%branch)), "\n" if $opt{'t'};
+print "insns: ", join(" ",keys(%insn)), "\n" if $opt{'t'};
+
+
+foreach my $file (glob("*.asm"), glob("*/*.asm")) {
+    print "file $file\n" if $opt{'t'};
+
+    open(FD, "<$file") or die "Cannot open $file: $!";
+    while (<FD>) {
+	if (/^[ \t]*C/) { next; };
+	if (/^\t([a-z0-9]+)/) {
+	    my $opcode = $1;
+	    print "opcode $1\n" if $opt{'t'};
+
+	    # instructions with an l, w or b suffix should have a definsn
+	    # (unless they're already a defbranch)
+	    if ($opcode =~ /[lwb]$/
+		&& ! defined $insn{$opcode}
+		&& ! defined $branch{$opcode})
+	    {
+		print "$file: $.: missing m68k_definsn: $opcode\n";
+	    }
+
+	    # instructions bXX should have a defbranch (unless they're
+	    # already a definsn)
+	    if ($opcode =~ /^b/
+		&& ! defined $insn{$opcode}
+		&& ! defined $branch{$opcode})
+	    {
+		print "$file: $.: missing m68k_defbranch: $opcode\n";
+	    }
+	}
+    }
+    close(FD);
+}