Trigonometric functions using fdlibm.

test/mjsunit/sin-cos.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 139 matching lines @@
 }
 
 var err_rms = Math.sqrt(squares[0] / test_inputs.length / 2);
 assertEqualsDelta(0, err_rms, 1E-14);
 
 assertEquals(-1, Math.cos({ valueOf: function() { return Math.PI; } }));
 assertEquals(0, Math.sin("0x00000"));
 assertEquals(1, Math.cos("0x00000"));
 assertTrue(isNaN(Math.sin(Infinity)));
 assertTrue(isNaN(Math.cos("-Infinity")));
-assertEquals("Infinity", String(Math.tan(Math.PI/2)));
-assertEquals("-Infinity", String(Math.tan(-Math.PI/2)));
+assertTrue(Math.tan(Math.PI/2) > 1e16);
+assertTrue(Math.tan(-Math.PI/2) < -1e16);
 assertEquals("-Infinity", String(1/Math.sin("-0")));
 
 // Assert that the remainder after division by pi is reasonably precise.
 function assertError(expected, x, epsilon) {
   assertTrue(Math.abs(x - expected) < epsilon);
 }
 
 assertEqualsDelta(0.9367521275331447,  Math.cos(1e06),  1e-15);
 assertEqualsDelta(0.8731196226768560,  Math.cos(1e10),  1e-08);
 assertEqualsDelta(0.9367521275331447,  Math.cos(-1e06), 1e-15);
 assertEqualsDelta(0.8731196226768560,  Math.cos(-1e10), 1e-08);
 assertEqualsDelta(-0.3499935021712929, Math.sin(1e06),  1e-15);
 assertEqualsDelta(-0.4875060250875106, Math.sin(1e10),  1e-08);
 assertEqualsDelta(0.3499935021712929,  Math.sin(-1e06), 1e-15);
 assertEqualsDelta(0.4875060250875106,  Math.sin(-1e10), 1e-08);
 assertEqualsDelta(0.7796880066069787,  Math.sin(1e16),  1e-05);
 assertEqualsDelta(-0.6261681981330861, Math.cos(1e16),  1e-05);
 
 // Assert that remainder calculation terminates.
 for (var i = -1024; i < 1024; i++) {
   assertFalse(isNaN(Math.sin(Math.pow(2, i))));
 }
 
 assertFalse(isNaN(Math.cos(1.57079632679489700)));
 assertFalse(isNaN(Math.cos(-1e-100)));
 assertFalse(isNaN(Math.cos(-1e-323)));
+
+// Tests for specific values expected from the fdlibm implementation.
+
+var two_32 = Math.pow(2, -32);
+var two_28 = Math.pow(2, -28);
+
+// Tests for Math.sin for |x| < pi/4
+assertEquals(Infinity, 1/Math.sin(+0.0));
+assertEquals(-Infinity, 1/Math.sin(-0.0));
+assertEquals(two_32, Math.sin(two_32));
+assertEquals(-two_32, Math.sin(-two_32));
+assertEquals(0.3826834323650898, Math.sin(Math.PI/8));
+assertEquals(-0.3826834323650898, -Math.sin(Math.PI/8));
+
+// Tests for Math.cos for |x| < pi/4
+assertEquals(1, Math.cos(two_32));
+assertEquals(1, Math.cos(-two_32));
+assertEquals(0.9876883405951378, Math.cos(Math.PI/20));
+assertEquals(0.7100335477927638, Math.cos(0.7812504768371582));
+assertEquals(0.7100338835660797, Math.cos(0.78125));
+assertEquals(0.9238795325112867, Math.cos(Math.PI/8));
+assertEquals(0.9238795325112867, Math.cos(-Math.PI/8));
+
+// Tests for Math.tan for |x| < pi/4
+assertEquals("Infinity", String(1/Math.tan(0.0)));
+assertEquals("-Infinity", String(1/Math.tan(-0.0)));
+assertEquals(two_32, Math.tan(two_32));
+assertEquals(-two_32, Math.tan(-two_32));
+assertEquals(0.8211418015898941, Math.tan(11/16));
+assertEquals(-0.8211418015898941, Math.tan(-11/16));
+assertEquals(0.41421356237309503, Math.tan(Math.PI / 8));
+
+// Tests for Math.sin.
+assertEquals(0.479425538604203, Math.sin(0.5));
+assertEquals(-0.479425538604203, Math.sin(-0.5));
+assertEquals(1, Math.sin(Math.PI/2));
+assertEquals(-1, Math.sin(-Math.PI/2));
+assertEquals(1.2246467991473532e-16, Math.sin(Math.PI));
+assertEquals(-7.047032979958965e-14, Math.sin(2200*Math.PI));
+assertEquals(-0.7071067811865477, Math.sin(7/4 * Math.PI));
+assertEquals(0.7071067811865474, Math.sin(9/4 * Math.PI));
+assertEquals(0.7071067811865483, Math.sin(11/4 * Math.PI));
+assertEquals(-0.7071067811865479, Math.sin(13/4 * Math.PI));
+assertEquals(-3.2103381051568376e-11, Math.sin(1048576/4 * Math.PI));
+
+// Tests for Math.cos.
+assertEquals(1, Math.cos(two_28));
+assertEquals(0.9689124217106447, Math.cos(0.25));
+assertEquals(0.8775825618903728, Math.cos(0.5));
+assertEquals(0.7073882691671998, Math.cos(0.785));
+assertEquals(6.123233995736766e-17, Math.cos(Math.PI/2));
+assertEquals(0.7071067811865474, Math.cos(7/4 * Math.PI));
+assertEquals(0.7071067811865477, Math.cos(9/4 * Math.PI));
+assertEquals(-0.7071067811865467, Math.cos(11/4 * Math.PI));
+assertEquals(-0.7071067811865471, Math.cos(13/4 * Math.PI));
+assertEquals(0.9367521275331447, Math.cos(1000000));
+assertEquals(-3.435757038074824e-12, Math.cos(1048575/2 * Math.PI));
+
+// Tests for Math.tan.
+assertEquals(two_28, Math.tan(two_28));
+assertEquals(1.633123935319537e16, Math.tan(Math.PI/2));
+assertEquals(0.5463024898437905, Math.tan(0.5));
+assertEquals(0.8211418015898941, Math.tan(11/16));
+assertEquals(2.0000000000000027, Math.tan(1.107148717794091));
+assertEquals(-1.0000000000000004, Math.tan(7/4*Math.PI));
+assertEquals(0.9999999999999994, Math.tan(9/4*Math.PI));
+assertEquals(-6.420676210313675e-11, Math.tan(1048576/2*Math.PI));
+assertEquals(2.910566692924059e11, Math.tan(1048575/2*Math.PI));