From e9a84050dec5f941fadd8c53b4f672609885f463 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Fri, 18 Aug 2017 14:23:01 +0200
Subject: Add restrict keyword for DPD apply_coeff

---
 src/MemlessPoly.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/MemlessPoly.cpp b/src/MemlessPoly.cpp
index 0cc04f2..6686c41 100644
--- a/src/MemlessPoly.cpp
+++ b/src/MemlessPoly.cpp
@@ -118,10 +118,14 @@ void MemlessPoly::load_coefficients(const std::string &coefFile)
     }
 }
 
+/* The restrict keyword is C99, g++ and clang++ however support __restrict
+ * instead, and this allows the compiler to auto-vectorize the loop.
+ */
+
 static void apply_coeff(
         const vector<complexf> &coefs,
-        const complexf* in, size_t start, size_t stop,
-        complexf* out)
+        const complexf *__restrict in, size_t start, size_t stop,
+        complexf *__restrict out)
 {
     for (size_t i = start; i < stop; i++) {
 
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