From f85fd79c6c37cdbd32d9edc37efc985f1f4bc3bb Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Tue, 25 Apr 2017 12:22:04 +1000
Subject: [PATCH] py/mpz: In mpn_sub, use existing function to remove trailing
 zeros.

---
 py/mpz.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/py/mpz.c b/py/mpz.c
index c6832e3898..f5675a2917 100644
--- a/py/mpz.c
+++ b/py/mpz.c
@@ -49,6 +49,12 @@
  Definition of normalise: ?
 */
 
+STATIC size_t mpn_remove_trailing_zeros(mpz_dig_t *oidig, mpz_dig_t *idig) {
+    for (--idig; idig >= oidig && *idig == 0; --idig) {
+    }
+    return idig + 1 - oidig;
+}
+
 /* compares i with j
    returns sign(i - j)
    assumes i, j are normalised
@@ -190,16 +196,7 @@ STATIC size_t mpn_sub(mpz_dig_t *idig, const mpz_dig_t *jdig, size_t jlen, const
         borrow >>= DIG_SIZE;
     }
 
-    for (--idig; idig >= oidig && *idig == 0; --idig) {
-    }
-
-    return idig + 1 - oidig;
-}
-
-STATIC size_t mpn_remove_trailing_zeros(mpz_dig_t *oidig, mpz_dig_t *idig) {
-    for (--idig; idig >= oidig && *idig == 0; --idig) {
-    }
-    return idig + 1 - oidig;
+    return mpn_remove_trailing_zeros(oidig, idig);
 }
 
 #if MICROPY_OPT_MPZ_BITWISE