genlib/divider: fix diff computation

diff --git a/migen/genlib/divider.py b/migen/genlib/divider.py
index 05459332d041d1ca43ce864979598955b43e194f..7f50a079ee642a0207e31e2c19e07a88d4d82fdb 100644 (file)
--- a/migen/genlib/divider.py
+++ b/migen/genlib/divider.py
@@ -20,7 +20,7 @@ class Divider(Module):
                        self.quotient_o.eq(qr[:w]),
                        self.remainder_o.eq(qr[w:]),
                        self.ready_o.eq(counter == 0),
-                       diff.eq(self.remainder_o - divisor_r)
+                       diff.eq(qr[w-1:] - divisor_r)
                ]
                self.sync += [
                        If(self.start_i,