v8/test/mjsunit/regress/regress-8265.js

// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --random-seed=1

for (let i = 0; i < 54; ++i) Math.random();
let sum = 0;
for (let i = 0; i < 10; ++i)
  sum += Math.floor(Math.random() * 50);

assertNotEquals(0, sum);
Warm up RNG when --random_seed is used The RNG state is initialized with random_seed parameter that usually has lots of zeros. Each random generation iteration shuffles bits with xor operation over the state. It takes a while before the state is populated with enough 1s and starts generating uniformly distributed numbers. The patch warms up the state with 32 iterations when --random_seed is used. BUG=v8:8265 Change-Id: I7a4e8c842962bea0f2935c7b3673494367d8580f Reviewed-on: https://chromium-review.googlesource.com/c/1263816 Commit-Queue: Alexei Filippov <alph@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#56418} 2018-10-05 14:10:16 +00:00			`// Copyright 2018 the V8 project authors. All rights reserved.`
			`// Use of this source code is governed by a BSD-style license that can be`
			`// found in the LICENSE file.`

Revert "[flags] warn about contradictory flags" This reverts commit b8f91666649b637e87a338f884d7987b169f6692. Reason for revert: Fails gc-stress (https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20gc%20stress/28341). Original change's description: > [flags] warn about contradictory flags > > Design Doc: https://docs.google.com/document/d/1lkvu8crkK7Ei39qjkPCFijpNyxWXsOktG9GB-7K34jM/ > > Bug: v8:10577 > Change-Id: Ib9cfdffa401c48c895bf31caed5ee03545beddab > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2154792 > Reviewed-by: Clemens Backes <clemensb@chromium.org> > Reviewed-by: Michael Achenbach <machenbach@chromium.org> > Reviewed-by: Georg Neis <neis@chromium.org> > Reviewed-by: Tamer Tas <tmrts@chromium.org> > Commit-Queue: Tobias Tebbi <tebbi@chromium.org> > Cr-Commit-Position: refs/heads/master@{#68168} TBR=machenbach@chromium.org,neis@chromium.org,clemensb@chromium.org,tebbi@chromium.org,tmrts@chromium.org Change-Id: Ia1e3373fbb4c369594ceb98eb560e3ccf2cb8780 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: v8:10577 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230523 Reviewed-by: Clemens Backes <clemensb@chromium.org> Commit-Queue: Clemens Backes <clemensb@chromium.org> Cr-Commit-Position: refs/heads/master@{#68169} 2020-06-04 10:19:46 +00:00			`// Flags: --random-seed=1`

Warm up RNG when --random_seed is used The RNG state is initialized with random_seed parameter that usually has lots of zeros. Each random generation iteration shuffles bits with xor operation over the state. It takes a while before the state is populated with enough 1s and starts generating uniformly distributed numbers. The patch warms up the state with 32 iterations when --random_seed is used. BUG=v8:8265 Change-Id: I7a4e8c842962bea0f2935c7b3673494367d8580f Reviewed-on: https://chromium-review.googlesource.com/c/1263816 Commit-Queue: Alexei Filippov <alph@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#56418} 2018-10-05 14:10:16 +00:00			`for (let i = 0; i < 54; ++i) Math.random();`
			`let sum = 0;`
			`for (let i = 0; i < 10; ++i)`
			`sum += Math.floor(Math.random() * 50);`

			`assertNotEquals(0, sum);`