1 files changed, 25 insertions, 0 deletions
diff --git a/libm/e_exp.c b/libm/e_exp.c
index ebf2e5af0..abfb17675 100644
--- a/libm/e_exp.c
+++ b/libm/e_exp.c
@@ -155,3 +155,28 @@ double attribute_hidden __ieee754_exp(double x)	/* default IEEE double exp */
 	    return y*twom1000;
 	}
 }
+
+/*
+ * wrapper exp(x)
+ */
+#ifndef _IEEE_LIBM
+double exp(double x)
+{
+	static const double o_threshold =  7.09782712893383973096e+02; /* 0x40862E42, 0xFEFA39EF */
+	static const double u_threshold = -7.45133219101941108420e+02; /* 0xc0874910, 0xD52D3051 */
+
+	double z = __ieee754_exp(x);
+	if (_LIB_VERSION == _IEEE_)
+		return z;
+	if (isfinite(x)) {
+		if (x > o_threshold)
+			return __kernel_standard(x, x, 6); /* exp overflow */
+		if (x < u_threshold)
+			return __kernel_standard(x, x, 7); /* exp underflow */
+	}
+	return z;
+}
+#else
+strong_alias(__ieee754_exp, exp)
+#endif
+libm_hidden_def(exp)