From 35669405ac2498051392ef8992e9042a298cbb93 Mon Sep 17 00:00:00 2001
From: Matthieu Cattin <matthieu.cattin@cern.ch>
Date: Wed, 2 Feb 2011 14:00:33 +0000
Subject: [PATCH] Fix bug in log2_ceil function. odd numbers were leading to
stack overflow during synthesis
---
hdl/gn4124core/rtl/gn4124_core_pkg_s6.vhd | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/hdl/gn4124core/rtl/gn4124_core_pkg_s6.vhd b/hdl/gn4124core/rtl/gn4124_core_pkg_s6.vhd
index 4aea0b8..af17865 100644
--- a/hdl/gn4124core/rtl/gn4124_core_pkg_s6.vhd
+++ b/hdl/gn4124core/rtl/gn4124_core_pkg_s6.vhd
@@ -530,12 +530,10 @@ package body gn4124_core_pkg is
begin
if N <= 2 then
return 1;
+ elsif N mod 2 = 0 then
+ return 1 + log2_ceil(N/2);
else
- if N mod 2 = 0 then
- return 1 + log2_ceil(N/2);
- else
- return 1 + log2_ceil(N+1/2);
- end if;
+ return 1 + log2_ceil((N+1)/2);
end if;
end;
--
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