HeapWithPointerCompressionTest.HeapLayout sometimes raced with
background threads. When iterating chunks, background threads might add
chunks concurrently. Prevent this by enforcing safepoint during
iteration.

Bug: v8:10315
Change-Id: I2852ec3ea18905b669e60eadc660d9343ea35f48
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2390767
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69696}

There is an int version that will be TNodified in a follow-up CL.

Bug: v8:9708, v8:6949
Change-Id: I3a47cb352396dfe9dea426b6396216c06e0e3254
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2387963
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69695}

This is a reland of 9eb090d2

The android-pie-arm64-dbg compiler error was fixed in:
https://chromium-review.googlesource.com/c/v8/v8/+/2381450

Original change's description:
> [heap] Add concurrent typed slot recording
>
> Since the typed slot set is not thread-safe, each concurrent marking
> barrier collects typed slots locally and publishes them to the main
> typed slot set in safepoints.
> Bug: v8:10315
>
> Change-Id: If1f5c5df786df88aac7bc27088afe91a4173c826
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2370302
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#69576}

Bug: v8:10315
Change-Id: Iae2882bad1cd0ffcae28c96318ba5fd7937f2215
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2390763Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69694}

Tests that use SimulateFullSpace and SealCurrentObjects do not work
if there is a background thread allocating concurrently.

Bug: v8:10315
Change-Id: I73a4c9db8eb32fdf3e07fcb8f5dda309de797709
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2390765Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69693}

This used to break x64 no embed bot due to it being Large code objects
but no embed no longer exists so this isn't a problem anymore.

Bug: v8:9708, v8:6949, v8:9637
Change-Id: I83836a94ff1747841315d46ca0e7ec5c73bbaf0d
Fix: v8:9637
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2387962Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69692}

ManualGCScope is used in tests that perform GC manually. Stressing
concurrent allocation interferes with that and may trigger more GCs
than the test expects.

Bug: v8:10315
Change-Id: I6705f0b7cc555074b319a41d29810936b5a2a556
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2392242Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69691}

This is a reland of 453cf219

Original change's description:
> [compiler] Add a StartNode wrapper class
>
> .. to make implicit semantics of output nodes explicit.
>
> Bug: v8:8888
> Change-Id: I2ea5f5fa02f3d1f51196ea1e1e46b526dd9dc7d6
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388117
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#69681}

Tbr: tebbi@chromium.org
Bug: v8:8888
Change-Id: I7ff3fc64c607a5289981a0762ad3a2b1de5a284d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2392241
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69690}

JSFunctions with an attached InterpreterEntryTrampoline should also be
reset to CompileLazy, but this was recently broken by
https://crrev.com/c/2345966.

This CL introduces a new JSFunction::CanDiscardCompiled helper to
mirror SFI::CanDiscardCompiled, and uses it during serialization.

Bug: v8:10869
Change-Id: I176b77278d2d40d34db671638232faec4dda1d9c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2390145Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69689}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/6d55754..7cbd827

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/156bfc1..8584a9d

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/ed15af5..56048e6

TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: I64ddc2caa6feae1432aa3a7cba4e854de98acf38
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2391803Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#69688}

Due to the way SSE flags work, we need to enable all versions prior to
SSE 4.1 as well.

Bug: v8:10863
Change-Id: I50ddd3f486641e7bf22c651fc2c9a8a4ccbc2b46
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2391325Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69687}

The type of m is long in 64 bits build, and results implicit conversion
loses integer precision, which was found by improved clang warning
(-Wshorten-64-to-32)

Bug: chromium:1124085
Change-Id: Ic9f22508bd817a06d5c90162b1ac3554a7171529
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2391323
Commit-Queue: Zequan Wu <zequanwu@google.com>
Auto-Submit: Zequan Wu <zequanwu@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69686}

This was added to try and skip tests when run on platforms without
sse41, but it doesn't work fuzz tests, since they add the flags on
command line. With https://crrev.com/c/2389982 we are now adding the
flag in the js test file itself.

Remove this condition since it's likely to be confusing and not work
correctly for all tests.

Bug: v8:10863
Change-Id: Ieeadade05dfc04ce250710d09a6a272775ce98c9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2391321Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69685}

With https://crrev.com/c/2389982 we are now forcing the sse flag in this
test, so we no longer need the flag check. Keep it around for the other
archs.

The nosse41 condition will be removed from the test runner in the next
patch.

Bug: v8:10863
Change-Id: I7eacb21803e6cc810384d3e4881d2a965dc1ad69
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2391320Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69684}

- JobHandle::IsCompleted()
- JobDelegate::GetTaskId()
- worker_count passed as argument to GetMaxConcurrency().
  Jobs implementation must call the new GetMaxConcurrency(), but Jobs
  users aren't migrated yet.

Bug: chromium:1114823
Change-Id: Ie09a8847d1cb884b1e388903370e49f33fa25a64
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2374308Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69683}

This reverts commit 453cf219.

Reason for revert: Multiple compile errors, e.g. https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20debug%20builder/45301

Original change's description:
> [compiler] Add a StartNode wrapper class
> 
> .. to make implicit semantics of output nodes explicit.
> 
> Bug: v8:8888
> Change-Id: I2ea5f5fa02f3d1f51196ea1e1e46b526dd9dc7d6
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388117
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#69681}

TBR=jgruber@chromium.org,tebbi@chromium.org

Change-Id: Ic81321960da36e8ddcdc8e0072b2e9cd41206478
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8888
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2390646Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69682}

.. to make implicit semantics of output nodes explicit.

Bug: v8:8888
Change-Id: I2ea5f5fa02f3d1f51196ea1e1e46b526dd9dc7d6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388117
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69681}

Pass this flag to print all generated nci code.

Bug: v8:8888
Change-Id: I12a5e7433278c72da4a973c5890b2fb2d7857e70
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388115
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69680}

The BigInt constructor has quadratic complexity while parsing strings,
and the input is unbounded. Interrupts should be checked during this
operation to ensure the host has control over runaway execution.

Change-Id: I15db9adeeafadc7b866a395dd8263aa8c2109ce8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2384166Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69679}

Bug: v8:10641
Change-Id: I9248c6877ead34e622b94cd32959b6570f824e15
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2390442Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Auto-Submit: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69678}

During spread operation, after VisitForAccumulatorValue,
set the position of the current expression again

Bug: chromium:929844
Change-Id: I6e9ca87587789f9cb21e939d4405414c8170b232
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2379531
Commit-Queue: HyeockJin Kim <kherootz@gmail.com>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69677}

This CL unifies the map-processor and ic-processor into a
single log processing pipeline. Unified processing pipeline
prevents doing 2 pass over the data.

Bug: v8:10644

Change-Id: Ic0221a9bb32901f43202390b98fded4830a50f70
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2385496
Commit-Queue: Zeynep Cankara <zcankara@google.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69676}

A random grab-bag of trivial fixes I came across while working on
another CL.

Bug: v8:8888
Change-Id: I6e46e1fe5a547854d8afbac19f7e049f1661c406
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388113
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69675}

v8::String::IsExternal is confusing since it only checks for external
two byte strings. The goal is to reintroduce String::IsExternal which
checks for one and two byte external strings after removing the old,
misleading api method.

- Add String::IsExternalTwoByte
- Deprecate String::IsExternal for now since it is misleading


Bug: v8:10641
Change-Id: I8989de7576c823846e0536fc1898e769b6d68c87
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2284495
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69674}

This CL enables showing map details of the selected map coming from
FocusEvent. It also improves UI experience of selecting a map from
map transitions, highlighting selected map.

Additionally, stores information about unique map/IC events in model
for the timeline-track legend.

Bug: v8:10644
Change-Id: Ieb8a2ac0bf1af282d55bce18130192d7178538da
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2387564Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Zeynep Cankara <zcankara@google.com>
Cr-Commit-Position: refs/heads/master@{#69673}

The d8 shell modifies compiler flags in PrepareStressRun after isolate
was already set up and has run some JS code. Updating these flags
forces recomputation of implications for all flags.

This causes no-op stores to some unrelated flags that are accessed
from background threads leading to benign data races.

Bug: v8:10315
Change-Id: I568445d4382ae392970deccbf9588c98e46a4a4e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2390140
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69672}

This is a follow up for
https://chromium-review.googlesource.com/c/v8/v8/+/2362918 .

The "slow" path in HandleLoadICSmiHandlerLoadNamedCase was using
only "receiver", even though it should've considered both "receiver"
and "holder".

Bug: v8:9237
Change-Id: I5d7ba1f72e8bf55f9533f648054abf5d25c85533
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2387576
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69671}

- Avoid invoking Trace() for in-construction objects as the method may
  access uninitialized fields, e.g., fields that have bogus state with
  zeroed memory like std::list.
- Conservatively scan in-construction objects for pointers.
- Verify that stack scan indeed finds all in-construction objects that
  are present on the heap and vice versa.

Bug: chromium:1056170
Change-Id: I2c68da2b8072f715b5a0dcdb1202d5f874c6c6e9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388106Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69670}

This CL adds drag handlers to the timeline panel
to filter events based on the selected portion
of the timeline tracks.

Bug: v8:10644
Change-Id: Ic8a38493eacb62844b3fed5a027f8b1367f2bb59
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2346275
Commit-Queue: Zeynep Cankara <zcankara@google.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69669}

Previously we checked whether a thread's pc IsPcProcessed before pushing
to the stack of (postponed) active_threads_.  This commit moves the
IsPcProcessed check and corresponding MarkPcProcessed call to when the
thread is actually processed, i.e. when it is popped from the
active_threads_ stack again.

This fixes two issues:
- Consider what used to happen in the following scenario:
1. An active thread t is postponed (e.g. because it is a fork) and
 pushed on active_threads_.  IsPcProcessed(t.pc) is false, so t is
 not discarded and does actually end up on active_threads_.
2. Some other thread s is executed, and at some point s.pc == t.pc,
 i.e. t.pc is marked as processed.
3. t is popped from active_threads_ for processing.

In 3 we don't want to continue execution of t: After all, its pc is
already marked as processed.  But because previously we only checked
for IsPcProcessed in step 1 before pushing to active_threads_, we used
to continue execution in 3.  I don't think this is a correctness
issue, but possibly a performance problem.  In any case, this commit
moves the IsPcProcessed check from 1 to 3 and so fixes this.
- After flushing blocked_threads_, we push them to active_threads_
again.  While doing so, we used to mark these thread's pcs as processed.
This meant that sometimes a (fork of a) high priority thread was
cancelled by the IsPcProcessed check even though its pc was only
marked as processed by a thread with lower priority during flushing.
We need it to be the other way round:  The low priority thread should
be cancelled after its pc is processed by a thread with higher
priority.
With this commit we don't MarkPcProcessed during flushing, it's
postponed to when we're actually processing.  This was a correctness
issue, and there's a new corresponding test case.


Bug: v8:10765
Change-Id: Ie12682cf3f8a04222d907edd8a3ad25baa69465a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388112
Commit-Queue: Martin Bidlingmaier <mbid@google.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69668}

The test is slow and checks the limits of the WebAssembly
implementation. Sanitizers are slower and therefore sometimes run into
timeouts. Therefore we just disable the test for sanitizers.

R=leszeks@chromium.org

Change-Id: I4a0cb994dfc34097849f0dd8528dc158883fbc8a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2389980
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69667}

Garbage collection requests from background threads are ignored if
the heap is tearing down. This fixes CanExpandOldGenerationBackground
to check for that case.

Bug: v8:10315
Change-Id: I79b6a4446bf3c9037dbca54849c87f022be76b49
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2387964
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69666}

The test is incompatible with --noenable-sse4-1, which is randomly
added by numfuzz (and possibly other fuzzers).

The "Flags" from the test files are always passed last and are often
used to neuter incompatible flags.

Bug: v8:10863
Change-Id: I8fd11b4d38586f25f5af63ab8ef83873dc250557
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2389982Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69665}

PrintRegisters() should print output to `os` argument for unification,
and in case of the function would be used by other files.

Bug: v8:10821
Change-Id: Ia825c4deaf89ec454b7c293367cfa362acd4cccc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2371543Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69664}

This adds the argument count (as intptr) to the standard frame.
StandardFrames are now in the same shape as OptimizedFrames.

The argument count in the stack will be used to tear down the arguments when we remove the arguments adaptor frame.

Change-Id: If9cc2946321bc1bb0abb776521e2d5b683ab0532
Bug: v8:10201
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2312783
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69663}

https://crrev.com/c/2369172 had a few remaining comments that
accidentally weren't addressed in the final submitted patch.

Tbr: jgruber@chromium.org
Change-Id: If0cff18f5078f17a6f70d27c71090dcc64f23ddd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388114Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69662}

Change-Id: I4e2a0ddbeba68a4cc136bb6d56383b0a7e4f1dff
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388107
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69661}

Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/482dd77..6d55754

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/1eb42f5..156bfc1

Rolling v8/third_party/requests: https://chromium.googlesource.com/external/github.com/kennethreitz/requests/+log/refs/ta..bfb93d4

Rolling v8/third_party/zlib: https://chromium.googlesource.com/chromium/src/third_party/zlib/+log/d53accf..59187e1

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/fcef86e..03bacc3

TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: Iceea7cbadbbe4e8a480517051425d1a44d76066d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388173Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#69660}

We were using vqsub incorrectly (which saturates), we need vsub
(wraparound).

Found this issue while running spec test simd_i64x2_arith.js.

Bug: v8:10835
Change-Id: Ic9d45d69e64fa5ff9ddad5de4690f3dd32d1384e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2389100Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69659}

This reverts commit 7f054679.

Reason for revert: regressions on Emscripten/Fannkuch and
JetStream/richards

Original change's description:
> [regalloc] Run SpillPlacer on any value defined in a loop
> 
> I previously wrote a comment that said "We haven't seen any indication
> of performance improvements from seeking optimal spilling positions
> except on loop-top phi values". That statement is no longer true, now
> that I've looked a little harder. In the latest version of the Mono
> interpreter, we can improve performance by 2.5% by enabling SpillPlacer
> for any value defined within a loop.
> 
> Bug: v8:10606
> Change-Id: I25e06458c87ad4ffcefe52be3042032e05a47b35
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2381557
> Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#69646}

TBR=rmcilroy@chromium.org,seth.brenith@microsoft.com,thibaudm@chromium.org

Change-Id: Ic3e74485f42bafedfe1890c0be32a29c3455afe5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10606, chromium:1124028
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388745Reviewed-by: Seth Brenith <seth.brenith@microsoft.com>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#69658}

Swizzle codegen was incorrect when mask == dst, which can happen since
we did not pin dst. We can simplify this by using scratch register for
mask.

This bug was encountered while trying to run the spec test simd-lane.js.

Bug: v8:10835
Change-Id: Ie9c8f383bb6f336f9b74955fb7a9aee0e6774bf2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2388743Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69657}