1 files changed, 94 insertions, 0 deletions
diff --git a/js/src/tests/non262/Math/expm1-monotonicity.js b/js/src/tests/non262/Math/expm1-monotonicity.js
new file mode 100644
index 0000000000..2ae25708d1
--- /dev/null
+++ b/js/src/tests/non262/Math/expm1-monotonicity.js
@@ -0,0 +1,94 @@
+var BUGNUMBER = 897634;
+var summary = "expm1 should be monotonically increasing";
+
+print(BUGNUMBER + ": " + summary);
+
+function test(x, prev, next) {
+    assertEq(Math.expm1(prev) <= Math.expm1(x), true);
+    assertEq(Math.expm1(x) <= Math.expm1(next), true);
+}
+
+// Thresholds in fdlibm expm1 implementation.
+
+// |hx| == 0x40862E42 or not
+test(-709.7822265625, -709.7822265625001, -709.7822265624999);
+test(709.7822265625, 709.7822265624999, 709.7822265625001);
+
+// |hx| == 0x4043687A or not
+test(-38.81622314453125, -38.81622314453126, -38.81622314453124);
+test(38.81622314453125, 38.81622314453124, 38.81622314453126);
+
+// |hx| == 0x7ff00000 or not
+test(-1.7976931348623157e+308, -Infinity, -1.7976931348623155e+308);
+test(1.7976931348623157e+308, 1.7976931348623155e+308, Infinity);
+
+// |hx| == 0x3fd62e42 or not
+test(-0.3465733528137207, -0.34657335281372076, -0.34657335281372065);
+test(0.3465733528137207, 0.34657335281372065, 0.34657335281372076);
+
+// |hx| == 0x3FF0A2B2 or not
+test(-1.0397205352783203, -1.0397205352783205, -1.03972053527832);
+test(1.0397205352783203, 1.03972053527832, 1.0397205352783205);
+
+// |hx| == 0x3c900000 or not
+test(-5.551115123125783e-17, -5.551115123125784e-17, -5.551115123125782e-17);
+test(5.551115123125783e-17, 5.551115123125782e-17, 5.551115123125784e-17);
+
+// x < -0.25 or not
+test(-0.25, -0.25000000000000006, -0.24999999999999997);
+
+// k == -1 or k == -2
+test(-1.0397207708399179, -1.039720770839918, -1.0397207708399177);
+
+// k == -1 or k == 0
+test(-0.3465735912322998, -0.34657359123229986, -0.34657359123229975);
+
+// k == 0 or k == 1
+test(0.3465735912322998, 0.34657359123229975, 0.34657359123229986);
+
+// k == 1 or k == 2
+test(1.039720770839918, 1.0397207708399179, 1.0397207708399183);
+
+// k == 19 or k == 20
+test(13.516370020918933, 13.51637002091893, 13.516370020918934);
+
+// k == 56 or k == 57
+test(39.16281570163691, 39.1628157016369, 39.162815701636916);
+
+// k == 1023 or k == 1024
+test(709.436139303104, 709.4361393031039, 709.4361393031041);
+
+// k == 1024 or more
+test(709.7827128933841, 709.782712893384, 709.7827128933842);
+
+// Some more random cases.
+test(-1.7976931348623157e+308, -Infinity, -1.7976931348623155e+308);
+test(-1e+223, -1.0000000000000002e+223, -9.999999999999999e+222);
+test(-1e+100, -1.0000000000000002e+100, -9.999999999999998e+99);
+test(-10000000000, -10000000000.000002, -9999999999.999998);
+test(-100000, -100000.00000000001, -99999.99999999999);
+test(-100, -100.00000000000001, -99.99999999999999);
+test(-10, -10.000000000000002, -9.999999999999998);
+test(-1, -1, -0.9999999999999999);
+test(-0.01, -0.010000000000000002, -0.009999999999999998);
+test(-0.00001, -0.000010000000000000003, -0.000009999999999999999);
+test(-1e-10, -1.0000000000000002e-10, -9.999999999999999e-11);
+test(-1e-100, -1.0000000000000001e-100, -9.999999999999999e-101);
+test(-5e-324, -1e-323, 0);
+test(0, -5e-324, 5e-324);
+test(5e-324, 0, 1e-323);
+test(1e-100, 9.999999999999999e-101, 1.0000000000000001e-100);
+test(1e-10, 9.999999999999999e-11, 1.0000000000000002e-10);
+test(0.00001, 0.000009999999999999999, 0.000010000000000000003);
+test(0.01, 0.009999999999999998, 0.010000000000000002);
+test(1, 0.9999999999999999, 1);
+test(10, 9.999999999999998, 10.000000000000002);
+test(100, 99.99999999999999, 100.00000000000001);
+test(100000, 99999.99999999999, 100000.00000000001);
+test(10000000000, 9999999999.999998, 10000000000.000002);
+test(1e+100, 9.999999999999998e+99, 1.0000000000000002e+100);
+test(1e+223, 9.999999999999999e+222, 1.0000000000000002e+223);
+test(1.7976931348623157e+308, 1.7976931348623155e+308, Infinity);
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);