From e8852ad12435e0a52a4a21e6ca61e2b6618619a9 Mon Sep 17 00:00:00 2001
From: Sei Lisa <sei-lisa@email.fake>
Date: Tue, 24 Jan 2017 06:02:45 +0100
Subject: [PATCH] Fix llFabs with corner cases.

Minus zero is returned unchanged. Indet and NaN are returned unchanged too.
---
 lslopt/lslbasefuncs.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lslopt/lslbasefuncs.py b/lslopt/lslbasefuncs.py
index cd038ce..7138b1d 100644
--- a/lslopt/lslbasefuncs.py
+++ b/lslopt/lslbasefuncs.py
@@ -1097,6 +1097,8 @@ def llEuler2Rot(v):
 
 def llFabs(f):
     assert isfloat(f)
+    if f == 0.0 or math.isnan(f): # llFabs(-0.0) is -0.0; llFabs(-nan) is -nan
+        return f
     return math.fabs(f)
 
 def llFloor(f):