deps: update v8 to 3.15.11

1 files changed, 64 insertions, 0 deletions

diff --git a/deps/v8/test/mjsunit/math-exp-precision.js b/deps/v8/test/mjsunit/math-exp-precision.js
new file mode 100644
index 0000000000..ace7edc58c
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+++ b/deps/v8/test/mjsunit/math-exp-precision.js
@@ -0,0 +1,64 @@
+// 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.
+
+// Tests that the --fast-math implementation of Math.exp() has
+// reasonable precision.
+
+function exp(x) {
+  return Math.exp(x);
+}
+
+var first_call_result = exp(Math.PI);
+var second_call_result = exp(Math.PI);
+
+function assertAlmostEquals(expected, actual, x) {
+  if (expected == 0 && actual == 0) return;  // OK
+  if (expected == Number.POSITIVE_INFINITY &&
+      actual == Number.POSITIVE_INFINITY) {
+    return;  // OK
+  }
+  relative_diff = Math.abs(expected/actual - 1);
+  assertTrue(relative_diff < 1e-12, "relative difference of " + relative_diff +
+                                    " for input " + x);
+}
+
+var increment = Math.PI / 35;  // Roughly 0.1, but we want to try many
+                               // different mantissae.
+for (var x = -708; x < 710; x += increment) {
+  var ex = exp(x);
+  var reference = Math.pow(Math.E, x);
+  assertAlmostEquals(reference, ex, x);
+  if (ex > 0 && isFinite(ex)) {
+    var back = Math.log(ex);
+    assertAlmostEquals(x, back, x + " (backwards)");
+  }
+}
+
+// Make sure optimizing the function does not alter the result.
+var last_call_result = exp(Math.PI);
+assertEquals(first_call_result, second_call_result);
+assertEquals(first_call_result, last_call_result);