From 1777f8c17e3d6dce20d61c513ad92ae8fbc1d089 Mon Sep 17 00:00:00 2001
From: Samuel Thomas <sgpthomas@gmail.com>
Date: Wed, 20 Nov 2019 18:59:50 -0500
Subject: [PATCH] emit loop flatten off pragmas

---
 src/main/scala/backends/VivadoBackend.scala | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main/scala/backends/VivadoBackend.scala b/src/main/scala/backends/VivadoBackend.scala
index 56fc67fa..a516dd7a 100644
--- a/src/main/scala/backends/VivadoBackend.scala
+++ b/src/main/scala/backends/VivadoBackend.scala
@@ -15,8 +15,8 @@ private class VivadoBackend extends CppLike {
   """.stripMargin.trim)
 
   def unroll(n: Int): Doc = n match {
-    case 1 => emptyDoc
-    case n => value(s"#pragma HLS UNROLL factor=$n skip_exit_check") <@> line
+    case 1 => value(s"#pragma HLS LOOP_FLATTEN off")
+    case n => value(s"#pragma HLS LOOP_FLATTEN off") <@> value(s"#pragma HLS UNROLL factor=$n skip_exit_check") <@> line
   }
 
   def interfaceValid(decls: List[Decl]) =