From 5f49ffc2d7fbee8178db0dbb142813ca73774c97 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Tue, 22 Mar 2016 08:14:29 +0000
Subject: [PATCH] Fix fencepost-error in subtraction code found while testing
 rounding.

---
 include/boost/multiprecision/cpp_bin_float.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/boost/multiprecision/cpp_bin_float.hpp b/include/boost/multiprecision/cpp_bin_float.hpp
index 559001e1..e393d131 100644
--- a/include/boost/multiprecision/cpp_bin_float.hpp
+++ b/include/boost/multiprecision/cpp_bin_float.hpp
@@ -595,7 +595,7 @@ inline void do_eval_subtract(cpp_bin_float<Digits, DigitBase, Allocator, Exponen
    if((e_diff > 0) || ((e_diff == 0) && a.bits().compare(b.bits()) >= 0))
    {
       dt = a.bits();
-      if(e_diff < (int)cpp_bin_float<Digits, DigitBase, Allocator, Exponent, MinE, MaxE>::bit_count)
+      if(e_diff <= (int)cpp_bin_float<Digits, DigitBase, Allocator, Exponent, MinE, MaxE>::bit_count)
       {
          eval_left_shift(dt, e_diff);
          res.exponent() = a.exponent() - e_diff;
@@ -607,7 +607,7 @@ inline void do_eval_subtract(cpp_bin_float<Digits, DigitBase, Allocator, Exponen
    else
    {
       dt = b.bits();
-      if(-e_diff < (int)cpp_bin_float<Digits, DigitBase, Allocator, Exponent, MinE, MaxE>::bit_count)
+      if(-e_diff <= (int)cpp_bin_float<Digits, DigitBase, Allocator, Exponent, MinE, MaxE>::bit_count)
       {
          eval_left_shift(dt, -e_diff);
          res.exponent() = b.exponent() + e_diff;