Improve Math.round(). Fix the bug in r4146. Further improve performance by ch...

test/mjsunit/math-round.js

Index: test/mjsunit/math-round.js
===================================================================
--- test/mjsunit/math-round.js	(revision 4179)
+++ test/mjsunit/math-round.js	(working copy)
@@ -50,3 +50,52 @@
 assertEquals(-9007199254740991, Math.round(-9007199254740991));
 assertEquals(Number.MAX_VALUE, Math.round(Number.MAX_VALUE));
 assertEquals(-Number.MAX_VALUE, Math.round(-Number.MAX_VALUE));
+
+assertEquals(536870911, Math.round(536870910.5));
+assertEquals(536870911, Math.round(536870911));
+assertEquals(536870911, Math.round(536870911.4));
+assertEquals(536870912, Math.round(536870911.5));
+assertEquals(536870912, Math.round(536870912));
+assertEquals(536870912, Math.round(536870912.4));
+assertEquals(536870913, Math.round(536870912.5));
+assertEquals(536870913, Math.round(536870913));
+assertEquals(536870913, Math.round(536870913.4));
+assertEquals(1073741823, Math.round(1073741822.5));
+assertEquals(1073741823, Math.round(1073741823));
+assertEquals(1073741823, Math.round(1073741823.4));
+assertEquals(1073741824, Math.round(1073741823.5));
+assertEquals(1073741824, Math.round(1073741824));
+assertEquals(1073741824, Math.round(1073741824.4));
+assertEquals(1073741825, Math.round(1073741824.5));
+assertEquals(2147483647, Math.round(2147483646.5));
+assertEquals(2147483647, Math.round(2147483647));
+assertEquals(2147483647, Math.round(2147483647.4));
+assertEquals(2147483648, Math.round(2147483647.5));
+assertEquals(2147483648, Math.round(2147483648));
+assertEquals(2147483648, Math.round(2147483648.4));
+assertEquals(2147483649, Math.round(2147483648.5));
+
+// Tests based on WebKit LayoutTests
+
+assertEquals(0, Math.round(0.4));
+assertEquals(-0, Math.round(-0.4));
+assertEquals(-0, Math.round(-0.5));
+assertEquals(1, Math.round(0.6));
+assertEquals(-1, Math.round(-0.6));
+assertEquals(2, Math.round(1.5));
+assertEquals(2, Math.round(1.6));
+assertEquals(-2, Math.round(-1.6));
+assertEquals(8640000000000000, Math.round(8640000000000000));
+assertEquals(8640000000000001, Math.round(8640000000000001));
+assertEquals(8640000000000002, Math.round(8640000000000002));
+assertEquals(9007199254740990, Math.round(9007199254740990));
+assertEquals(9007199254740991, Math.round(9007199254740991));
+assertEquals(1.7976931348623157e+308, Math.round(1.7976931348623157e+308));
+assertEquals(-8640000000000000, Math.round(-8640000000000000));
+assertEquals(-8640000000000001, Math.round(-8640000000000001));
+assertEquals(-8640000000000002, Math.round(-8640000000000002));
+assertEquals(-9007199254740990, Math.round(-9007199254740990));
+assertEquals(-9007199254740991, Math.round(-9007199254740991));
+assertEquals(-1.7976931348623157e+308, Math.round(-1.7976931348623157e+308));
+assertEquals(Infinity, Math.round(Infinity));
+assertEquals(-Infinity, Math.round(-Infinity));