TestFloat fails on fma tests

Created by: davidharrishmc

sim-testfloat-batch all passes, but sim-testfloat-batch fma fails right away. Why does one pass and the other fail, and which is right?

# Running f64_mulAdd_rne.tv vectors 
# 
# Error in f64_mulAdd_rne.tv
# TestNum          0 OpCtrl 0
# inputs: bcafffffe7ffffff 3fdfffffffffffff 3ff0000000000000
# SrcA: xxxxxxxxxxxxxxxx
#  Res: 3ff0000000000000 01
#  Expected: 3fefffffffffffff 01