ARM improvements to constant div, mod and mul....

test/mjsunit/div-mod.js

+// Copyright 2009 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.
+
+// Test fast div and mod.
+
+function divmod(div_func, mod_func, x, y) {
+  var div_answer = (div_func)(x);
+  assertEquals(x / y, div_answer, x + "/" + y);
+  var mod_answer = (mod_func)(x);
+  assertEquals(x % y, mod_answer, x + "%" + y);
+  var minus_div_answer = (div_func)(-x);
+  assertEquals(-x / y, minus_div_answer, "-" + x + "/" + y);
+  var minus_mod_answer = (mod_func)(-x);
+  assertEquals(-x % y, minus_mod_answer, "-" + x + "%" + y);
+}
+
+
+function run_tests_for(divisor) {
+  print("(function(left) { return left / " + divisor + "; })");
+  var div_func = this.eval("(function(left) { return left / " + divisor + "; })");
+  var mod_func = this.eval("(function(left) { return left % " + divisor + "; })");
+  var exp;
+  // Strange number test.
+  divmod(div_func, mod_func, 0, divisor);
+  divmod(div_func, mod_func, 1 / 0, divisor);
+  // Floating point number test.
+  for (exp = -1024; exp <= 1024; exp += 4) {
+    divmod(div_func, mod_func, Math.pow(2, exp), divisor);
+    divmod(div_func, mod_func, 0.9999999 * Math.pow(2, exp), divisor);
+    divmod(div_func, mod_func, 1.0000001 * Math.pow(2, exp), divisor);
+  }
+  // Integer number test.
+  for (exp = 0; exp <= 32; exp++) {
+    divmod(div_func, mod_func, 1 << exp, divisor);
+    divmod(div_func, mod_func, (1 << exp) + 1, divisor);
+    divmod(div_func, mod_func, (1 << exp) - 1, divisor);
+  }
+  divmod(div_func, mod_func, Math.floor(0x1fffffff / 3), divisor);
+  divmod(div_func, mod_func, Math.floor(-0x20000000 / 3), divisor);
+}
+
+
+var divisors = [
+  0,
+  1,
+  2,
+  3,
+  4,
+  5,
+  6,
+  7,
+  8,
+  9,
+  10,
+  // These ones in the middle don't add much apart from slowness to the test.
+  0x1000000,
+  0x2000000,
+  0x4000000,
+  0x8000000,
+  0x10000000,
+  0x20000000,
+  0x40000000,
+  12,
+  60,
+  100,
+  1000 * 60 * 60 * 24];
+
+for (var i = 0; i < divisors.length; i++) {
+  run_tests_for(divisors[i]);
+}
+