Apply suggestions from code review

Author: skirpichev

Misc/NEWS.d/next/Library/2025-04-29-11-48-46.gh-issue-132876.lyTQGZ.rst

@@ -1 +1,2 @@
-Workaround broken ``ldexp()`` implementation on Windows 10.
+`ldexp()` on Windows doesn't round subnormal results before Windows 11, but should. Python's :func:`math.ldexp` wrapper now does round them, so results may change
+slightly, in rare cases of very small results, on Windows versions before 11.

Modules/mathmodule.c

@@ -2164,7 +2164,7 @@ math_ldexp_impl(PyObject *module, double x, PyObject *i)
         errno = 0;
         r = ldexp(x, (int)exp);
 #ifdef _MSC_VER
-        if (-DBL_MIN < r && r < DBL_MIN) {
+        if (DBL_MIN > r && r > -DBL_MIN) {
             /* Denormal (or zero) results can be incorrectly rounded here (rather,
                truncated).  Fixed in newer versions of the C runtime, included
                with Windows 11. */