Issue #14180: Fix an invalid rounding when compiler optimization are enabled
Use volatile keyword to disable localy unsafe float optimizations.
diff --git a/Python/pytime.c b/Python/pytime.c
index 75d80e2..e7dadc7 100644
--- a/Python/pytime.c
+++ b/Python/pytime.c
@@ -102,7 +102,9 @@
{
assert(denominator <= LONG_MAX);
if (PyFloat_Check(obj)) {
- double d, intpart, floatpart, err;
+ double d, intpart, err;
+ /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
+ volatile double floatpart;
d = PyFloat_AsDouble(obj);
floatpart = modf(d, &intpart);