From 8cd0a66a0fd7bb7d69153906942930c2e8c3dd17 Mon Sep 17 00:00:00 2001
From: Mark Dickinson <dickinsm@gmail.com>
Date: Sat, 23 Jan 2010 21:25:53 +0000
Subject: [PATCH] dtoa.c fix from upstream that fixes incorrectly rounded
 results for certain subnormals that are also halfway cases.

---
 Python/dtoa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Python/dtoa.c b/Python/dtoa.c
index 6a93aef3bda..4b2c6c36e31 100644
--- a/Python/dtoa.c
+++ b/Python/dtoa.c
@@ -2084,9 +2084,9 @@ _Py_dg_strtod(const char *s00, char **se)
             if (!odd)
                 break;
             if (dsign)
-                dval(&rv) += ulp(&rv);
+                dval(&rv) += sulp(&rv, &bc);
             else {
-                dval(&rv) -= ulp(&rv);
+                dval(&rv) -= sulp(&rv, &bc);
                 if (!dval(&rv)) {
                     if (bc.nd >nd)
                         break;