From: Tim Peters <tim.peters@gmail.com>
Date: Thu, 1 Nov 2001 23:59:56 +0000 (+0000)
Subject: float_divmod():  the code wasn't sick enough to stop the MS optimizer
X-Git-Tag: v2.2.1c1~914
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4e8ab5db38c84e981f1e4cd11fd375bf7469341e;p=python

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 7e12a09885..cdc9620c02 100644
--- 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;
 	}