float_divmod(): the code wasn't sick enough to stop the MS optimizer

from optimizing away mod's sign adjustment when mod == 0; so it got
the intended result only in the debug build.

diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index 7e12a09885eaf2e4398faf3a8efe6a1d8a69e138..cdc9620c0204c21ea6227af57ce520175a54ddaa 100644 (file)
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -476,7 +476,7 @@ float_divmod(PyObject *v, PyObject *w)
                   fmod returns different results across platforms; ensure
                   it has the same sign as the denominator; we'd like to do
                   "mod = wx * 0.0", but that may get optimized away */
-               mod = 0.0;
+               mod *= mod;  /* hide "mod = +0" from optimizer */
                if (wx < 0.0)
                        mod = -mod;
        }