Merge experimental/a64 to bleeding_edge.

test/mjsunit/smi-mul-const.js

-// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright 2014 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 --noalways-opt
 
-function mul(a, b) {
-    return a * b;
+function check(func, input, expected) {
+  func(-1);
+  func(-1);
+  %OptimizeFunctionOnNextCall(func);
+  assertEquals(expected, func(input));
+  assertOptimized(func);
 }
 
+function mul_by_neg_1(a) { return a * -1; }
+function mul_by_0(a) {  return a * 0; }
+function mul_by_1(a) { return a * 1; }
+function mul_by_2(a) { return a * 2; }
 
-mul(-1, 2);
-mul(-1, 2);
-%OptimizeFunctionOnNextCall(mul);
-assertEquals(-2, mul(-1, 2));
-assertOptimized(mul);
+check(mul_by_neg_1, 2, -2);
+check(mul_by_0, 2, 0);
+check(mul_by_1, 2, 2);
+check(mul_by_2, 2, 4);
+
+function limit_range(a) {
+  // Limit the range of 'a' to enable no-overflow optimizations.
+  return Math.max(Math.min(a | 0, 10), -10);
+}
+
+function mul_by_neg_127(a) { return limit_range(a) * -127; }
+function mul_by_neg_128(a) { return limit_range(a) * -128; }
+function mul_by_neg_129(a) { return limit_range(a) * -129; }
+function mul_by_1023(a) { return limit_range(a) * 1023; }
+function mul_by_1024(a) { return limit_range(a) * 1024; }
+function mul_by_1025(a) { return limit_range(a) * 1025; }
+
+check(mul_by_neg_127, 2, -254);
+check(mul_by_neg_128, 2, -256);
+check(mul_by_neg_129, 2, -258);
+check(mul_by_1023, 2, 2046);
+check(mul_by_1024, 2, 2048);
+check(mul_by_1025, 2, 2050);
 
 // Deopt on minus zero.
-assertEquals(-0, mul(-1, 0));
-assertUnoptimized(mul);
+assertEquals(-0, mul_by_neg_128(0));
+assertUnoptimized(mul_by_neg_128);
+assertEquals(-0, mul_by_2(-0));
+assertUnoptimized(mul_by_2);
 
-
-function mul2(a, b) {
-    return a * b;
-}
-
-mul2(-1, 2);
-mul2(-1, 2);
-%OptimizeFunctionOnNextCall(mul2);
+// Deopt on overflow.
 
 // 2^30 is a smi boundary on arm and ia32.
 var two_30 = 1 << 30;
-// 2^31 is a smi boundary on x64.
+// 2^31 is a smi boundary on arm64 and x64.
 var two_31 = 2 * two_30;
 
-if (%IsValidSmi(two_31)) {
-  // Deopt on two_31 on x64.
-  assertEquals(two_31, mul2(-two_31, -1));
-  assertUnoptimized(mul2);
+// TODO(rmcilroy): replace after r16361 with:  if (%IsValidSmi(two_31)) {
+if (true) {
+  assertEquals(two_31, mul_by_neg_1(-two_31));
+  assertUnoptimized(mul_by_neg_1);
 } else {
-  // Deopt on two_30 on ia32.
-  assertEquals(two_30, mul2(-two_30, -1));
-  assertUnoptimized(mul2);
+  assertEquals(two_30, mul_by_neg_1(-two_30));
+  assertUnoptimized(mul_by_neg_1);
 }