From 261896b5591e819fe9c874e69469783c16161586 Mon Sep 17 00:00:00 2001
From: Mark Dickinson <mdickinson@enthought.com>
Date: Fri, 27 Jan 2012 21:16:01 +0000
Subject: [PATCH] Issue #13889: Add missing _Py_SET_53BIT_PRECISION_* calls
 around uses of dtoa.c functions in float round.

---
 Objects/floatobject.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index 09c0e961ba5..e146a4fc7c7 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -919,9 +919,12 @@ double_round(double x, int ndigits) {
     char *buf, *buf_end, shortbuf[100], *mybuf=shortbuf;
     int decpt, sign;
     PyObject *result = NULL;
+    _Py_SET_53BIT_PRECISION_HEADER;
 
     /* round to a decimal string */
+    _Py_SET_53BIT_PRECISION_START;
     buf = _Py_dg_dtoa(x, 3, ndigits, &decpt, &sign, &buf_end);
+    _Py_SET_53BIT_PRECISION_END;
     if (buf == NULL) {
         PyErr_NoMemory();
         return NULL;
@@ -944,7 +947,9 @@ double_round(double x, int ndigits) {
 
     /* and convert the resulting string back to a double */
     errno = 0;
+    _Py_SET_53BIT_PRECISION_START;
     rounded = _Py_dg_strtod(mybuf, NULL);
+    _Py_SET_53BIT_PRECISION_END;
     if (errno == ERANGE && fabs(rounded) >= 1.)
         PyErr_SetString(PyExc_OverflowError,
                         "rounded value too large to represent");