[Python-checkins] cpython: Try to fix test_time.test_AsSecondsDouble() on "x86 Gentoo Non-Debug with X

[victor.stinner]

https://hg.python.org/cpython/rev/bafae65793a0
changeset:   97852:bafae65793a0
user:        Victor Stinner <victor.stinner at gmail.com>
date:        Thu Sep 10 11:48:00 2015 +0200
summary:
  Try to fix test_time.test_AsSecondsDouble() on "x86 Gentoo Non-Debug with X 3.x" buildbot

Use volatile keyword in _PyTime_Round()

files:
  Python/pytime.c |  11 ++++++++---
  1 files changed, 8 insertions(+), 3 deletions(-)


diff --git a/Python/pytime.c b/Python/pytime.c
--- a/Python/pytime.c
+++ b/Python/pytime.c
@@ -75,12 +75,17 @@
 static double
 _PyTime_Round(double x, _PyTime_round_t round)
 {
+    /* volatile avoids optimization changing how numbers are rounded */
+    volatile double d;
+
+    d = x;
     if (round == _PyTime_ROUND_HALF_EVEN)
-        return _PyTime_RoundHalfEven(x);
+        d = _PyTime_RoundHalfEven(d);
     else if (round == _PyTime_ROUND_CEILING)
-        return ceil(x);
+        d = ceil(d);
     else
-        return floor(x);
+        d = floor(d);
+    return d;
 }
 
 static int

-- 
Repository URL: https://hg.python.org/cpython