JezK

Edit File: math-floor-of-div.js

// 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 --nouse_inlining

// Use this function as reference. Make sure it is not inlined.
function div(a, b) {
  return a / b;
}

var limit = 0x1000000;
var exhaustive_limit = 100;
var step = 10;
var values = [0x10000001,
              0x12345678,
              -0x789abcdf,  // 0x87654321
              0x01234567,
              0x76543210,
              -0x80000000,  // 0x80000000
              0x7fffffff,
              -0x0fffffff,  // 0xf0000001
              0x00000010,
              -0x01000000   // 0xff000000
              ];

test_div();
%OptimizeFunctionOnNextCall(test_div);
test_div();

// Test for negative zero and overflow.
// Separate the tests to prevent deoptimizations from making the other optimized
// test unreachable.

function IsNegativeZero(x) {
  assertTrue(x == 0);  // Is 0 or -0.
  var y = 1 / x;
  assertFalse(isFinite(y));
  return y < 0;
}

function test_div_deopt_minus_zero() {
  var zero_in_array = [0];
  assertTrue(IsNegativeZero(Math.floor((zero_in_array[0] | 0) / -1)));
}

function test_div_deopt_overflow() {
  // We box the value in an array to avoid constant propagation.
  var min_int_in_array = [-2147483648];
  // We use '| 0' to force the representation to int32.
  assertEquals(-min_int_in_array[0],
               Math.floor((min_int_in_array[0] | 0) / -1));
}

test_div_deopt_minus_zero();
test_div_deopt_overflow();
%OptimizeFunctionOnNextCall(test_div_deopt_minus_zero);
%OptimizeFunctionOnNextCall(test_div_deopt_overflow);
test_div_deopt_minus_zero();
test_div_deopt_overflow();

JezK

Edit File: math-floor-of-div.js

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