From 6faaef21dff53e8ec050eb3079ba5d7406963010 Mon Sep 17 00:00:00 2001
From: Henry de Valence <hdevalence@hdevalence.ca>
Date: Fri, 23 Nov 2018 15:13:52 -0800
Subject: [PATCH] Add mul_by_pow_2 for IFMA

---
 src/backend/vector/ifma/edwards.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/backend/vector/ifma/edwards.rs b/src/backend/vector/ifma/edwards.rs
index 8e65f2f..9c2e7e8 100644
--- a/src/backend/vector/ifma/edwards.rs
+++ b/src/backend/vector/ifma/edwards.rs
@@ -93,6 +93,14 @@ impl ExtendedPoint {
 
         ExtendedPoint(&tmp2.shuffle(Shuffle::DBBD) * &tmp2.shuffle(Shuffle::CACA))
     }
+
+    pub fn mul_by_pow_2(&self, k: u32) -> ExtendedPoint {
+        let mut tmp: ExtendedPoint = *self;
+        for _ in 0..k {
+            tmp = tmp.double();
+        }
+        tmp
+    }
 }
 
 impl<'a, 'b> Add<&'b CachedPoint> for &'a ExtendedPoint {