v8/test/mjsunit/compare-known-objects.js
bmeurer e56f265f6d [ic] Also collect known map for relational comparison.
Previously we only collected the known map for equality comparisons. But
if we also collect it for relational comparisons, we can inline a fast
path of ToPrimitive on the objects, which is especially interesting
since both sides have the same map.

For now we only inline a very limited subset of ToPrimitive in
Crankshaft, which is when the receiver map (and its prototype chain)
doesn't have @@toPrimitive, and both valueOf and toString are the
default versions on the %ObjectPrototype%. In this case the relational
comparison would reduce to a string comparison of "[object CLASS]" with
itself and so we can reduce that to a boolean constant plus map checks
on both left and right hand side, plus code dependencies on the
prototype chain. This repairs the regression on box2d.

R=jkummerow@chromium.org
BUG=chromium:534200
LOG=n

Review URL: https://codereview.chromium.org/1355113002

Cr-Commit-Position: refs/heads/master@{#30852}
2015-09-21 16:05:43 +00:00

98 lines
3.1 KiB
JavaScript

// Copyright 2012 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
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
// OWNER OR 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.
// Flags: --allow-natives-syntax
// Test CompareIC stubs for normal and strict equality comparison of known
// objects in slow mode. These objects share the same map even though they
// might have completely different properties.
function eq(a, b) {
return a == b;
}
function eq_strict(a, b) {
return a === b;
}
function le(a, b) {
return a <= b;
}
function lt(a, b) {
return a < b;
}
function ge(a, b) {
return a >= b;
}
function gt(a, b) {
return a > b;
}
function test(a, b) {
// Check CompareIC for equality of known objects.
assertTrue(eq(a, a));
assertTrue(eq(b, b));
assertFalse(eq(a, b));
// Check CompareIC for strict equality of known objects.
assertTrue(eq_strict(a, a));
assertTrue(eq_strict(b, b));
assertFalse(eq_strict(a, b));
// Check CompareIC for less than or equal of known objects.
assertTrue(le(a, a));
assertTrue(le(a, b));
assertTrue(le(b, a));
// Check CompareIC for less than of known objects.
assertFalse(lt(a, a));
assertFalse(lt(a, b));
assertFalse(lt(b, a));
// Check CompareIC for greater than or equal of known objects.
assertTrue(ge(a, a));
assertTrue(ge(a, b));
assertTrue(ge(b, a));
// Check CompareIC for greater than of known objects.
assertFalse(gt(a, a));
assertFalse(gt(a, b));
assertFalse(gt(b, a));
}
function O(){};
O.prototype.t = function() {}
var obj1 = new O;
var obj2 = new O;
// Test original objects.
assertTrue(%HaveSameMap(obj1, obj2));
test(obj1, obj2);
// Test after adding property to first object.
obj1.x = 1;
test(obj1, obj2);