From 05e6f318c6ecccea73698367010e51812c5b3862 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 18 Aug 2011 16:59:21 -0700
Subject: Upgrade V8 to 3.5.6

---
 deps/v8/test/mjsunit/math-floor.js | 34 +++++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

(limited to 'deps/v8/test/mjsunit/math-floor.js')

diff --git a/deps/v8/test/mjsunit/math-floor.js b/deps/v8/test/mjsunit/math-floor.js
index 11f4cd789..f211ce2e5 100644
--- a/deps/v8/test/mjsunit/math-floor.js
+++ b/deps/v8/test/mjsunit/math-floor.js
@@ -27,10 +27,11 @@
 
 // Flags: --max-new-space-size=256 --allow-natives-syntax
 
+var test_id = 0;
+
 function testFloor(expect, input) {
-  function test(n) {
-    return Math.floor(n);
-  }
+  var test = new Function('n',
+                          '"' + (test_id++) + '";return Math.floor(n)');
   assertEquals(expect, test(input));
   assertEquals(expect, test(input));
   assertEquals(expect, test(input));
@@ -51,6 +52,17 @@ function test() {
   testFloor(-Infinity, -Infinity);
   testFloor(NaN, NaN);
 
+  // Ensure that a negative zero coming from Math.floor is properly handled
+  // by other operations.
+  function ifloor(x) {
+    return 1 / Math.floor(x);
+  }
+  assertEquals(-Infinity, ifloor(-0));
+  assertEquals(-Infinity, ifloor(-0));
+  assertEquals(-Infinity, ifloor(-0));
+  %OptimizeFunctionOnNextCall(ifloor);
+  assertEquals(-Infinity, ifloor(-0));
+
   testFloor(0, 0.1);
   testFloor(0, 0.49999999999999994);
   testFloor(0, 0.5);
@@ -129,3 +141,19 @@ function test() {
 for (var i = 0; i < 500; i++) {
   test();
 }
+
+
+// Regression test for a bug where a negative zero coming from Math.floor
+// was not properly handled by other operations.
+function floorsum(i, n) {
+  var ret = Math.floor(n);
+  while (--i > 0) {
+    ret += Math.floor(n);
+  }
+  return ret;
+}
+assertEquals(-0, floorsum(1, -0));
+%OptimizeFunctionOnNextCall(floorsum);
+// The optimized function will deopt.  Run it with enough iterations to try
+// to optimize via OSR (triggering the bug).
+assertEquals(-0, floorsum(100000, -0));
-- 
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