Add new test suite for migrated blink tests.

test/webkit/dfg-inlining-reg-alloc.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1.  Redistributions of source code must retain the above copyright
+//     notice, this list of conditions and the following disclaimer.
+// 2.  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 with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+description(
+"This tests that register allocation still works under register pressure induced by inlining, out-of-line function calls (i.e. unconditional register flushing), and slow paths for object creation (i.e. conditional register flushing)."
+);
+
+// Inlineable constructor.
+function foo(a, b, c) {
+    this.a = a;
+    this.b = b;
+    this.c = c;
+}
+
+// Non-inlineable function. This relies on a size limit for inlining, but still
+// produces integers. It also relies on the VM not reasoning about Math.log deeply
+// enough to find some way of optimizing this code to be small enough to inline.
+function bar(a, b) {
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    a += b;
+    a -= b;
+    b ^= a;
+    a += Math.log(b);
+    b += a;
+    b -= a;
+    a ^= b;
+    return (a - b) | 0;
+}
+
+// Function into which we will inline foo but not bar.
+function baz(a, b) {
+    return new foo(bar(2 * a + 1, b - 1), bar(2 * a, b - 1), a);
+}
+
+// Do the test. It's crucial that o.a, o.b, and o.c are checked on each
+// loop iteration.
+for (var i = 0; i < 1000; ++i) {
+    var o = baz(i, i + 1);
+    shouldBe("o.a", "bar(2 * i + 1, i)");
+    shouldBe("o.b", "bar(2 * i, i)");
+    shouldBe("o.c", "i");
+}