Library import 16 (#2433)

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1 files changed, 25 insertions, 0 deletions

diff --git a/contrib/tools/python3/Modules/_math.h b/contrib/tools/python3/Modules/_math.h
new file mode 100644
index 0000000000..2285b64747
--- /dev/null
+++ b/contrib/tools/python3/Modules/_math.h
@@ -0,0 +1,25 @@
+/* log1p(x) = log(1+x).  The log1p function is designed to avoid the
+   significant loss of precision that arises from direct evaluation when x is
+   small. Use the substitute from _math.h on all platforms: it includes
+   workarounds for buggy handling of zeros.
+ */
+
+static double
+_Py_log1p(double x)
+{
+    /* Some platforms (e.g. MacOS X 10.8, see gh-59682) supply a log1p function
+       but don't respect the sign of zero:  log1p(-0.0) gives 0.0 instead of
+       the correct result of -0.0.
+
+       To save fiddling with configure tests and platform checks, we handle the
+       special case of zero input directly on all platforms.
+    */
+    if (x == 0.0) {
+        return x;
+    }
+    else {
+        return log1p(x);
+    }
+}
+
+#define m_log1p _Py_log1p