From bd3e78bd98841fc101a78dae261ec93c4bce2fad Mon Sep 17 00:00:00 2001
From: Marco Bodrato <bodrato@mail.dm.unipi.it>
Date: Mon, 28 May 2018 06:24:27 +0200
Subject: mpn/generic/gcd_1.c: Avoid an undefined behaviour

---
 mpn/generic/gcd_1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mpn/generic/gcd_1.c b/mpn/generic/gcd_1.c
index 71c1b88ce..72cbe9641 100644
--- a/mpn/generic/gcd_1.c
+++ b/mpn/generic/gcd_1.c
@@ -184,7 +184,7 @@ mpn_gcd_1 (mp_srcptr up, mp_size_t size, mp_limb_t vlimb)
 	}
       count_trailing_zeros (c, t);
 #endif
-      ulimb >>= (c + 1);
+      ulimb = (ulimb >> c) >> 1;
     }
 
   vlimb = (vlimb << 1) | 1;
-- 
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