Previously we always lowered JSToBoolean(x:Number) to the subgraph
NumberLessThan(0.0, NumberAbs(x)), which deals with both 0, -0 and
NaNs appropriately. However this doesn't always generate the best,
especially when we can later derive from feedback that x is always
an Integral32 value, where the ideal code would be just a single
comparison to 0 w/o the absolute value computation.
R=mvstanton@chromium.org
BUG=v8:5267,v8:5270
Review-Url: https://codereview.chromium.org/2309953002
Cr-Commit-Position: refs/heads/master@{#39194}
This will allow for chaining ScopeInfos together to form the same chains
as contexts chains currently do.
BUG=v8:5215
R=mstarzinger@chromium.org,marja@chromium.org,bmeurer@chromium.org,rmcilroy@chromium.org
Review-Url: https://codereview.chromium.org/2314483002
Cr-Commit-Position: refs/heads/master@{#39192}
Generate a flag-setting instruction for a binary operation when
the result is tested for equality/inequality to zero.
BUG=
Review-Url: https://codereview.chromium.org/2315453002
Cr-Commit-Position: refs/heads/master@{#39183}
Since the extension field is already used for the catch name, store a
ContextExtension there instead.
In the future, this will allow for chaining ScopeInfos together, so we
no longer need a context chain for lazy parsing / compilation.
BUG=v8:5215
R=bmeurer@chromium.org,neis@chromium.org,marja@chromium.org
Review-Url: https://codereview.chromium.org/2302013002
Cr-Commit-Position: refs/heads/master@{#39164}
Fold a Select that negates a boolean value, i.e. returning true in the
false case and vice versa, into Branch users, similar to what we already
do for Branch nodes with BooleanNot inputs.
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2308303003
Cr-Commit-Position: refs/heads/master@{#39149}
For two FinishRegion nodes, the alias analysis returned "may alias" even
without properly looking through them.
Drive-by-fix: Add meaningful output for --trace-turbo-load-elimination.
R=jarin@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2301903002
Cr-Commit-Position: refs/heads/master@{#39075}
Now that the hole NaN is no longer represented as Float64Constant early
on, we should never see such a constant node in any JS-level graph, but
we will only see them after representation selection. Change Typer and
SimplifiedLowering appropriately (and fix the invalid tests).
R=jarin@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2299883003
Cr-Commit-Position: refs/heads/master@{#39063}
This way, many files which only need CompilationInfo but not compiler.h
and its dependencies can include just compilation-info.h.
BUG=
Review-Url: https://codereview.chromium.org/2284313003
Cr-Commit-Position: refs/heads/master@{#39038}
If the type of a tracked field or element value is less precise than the
advertised type of the field or element load, then we replace the load
operation with a TypeGuard that guards the advertised type.
R=jarin@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2295643002
Cr-Commit-Position: refs/heads/master@{#39032}
Drop the typing rules for the machine operators and replace them
with UNREACHABLE. These typing rules were never correct and there's
also no need to have those rules at all.
Drive-by-fix: Remove the extremely annoying test-simplified-lowering.cc
file, which is not very useful, but consumes a large amount of time to
keep it compiling and passing. Instead we should introduce appropriate
tests for the SimplifiedLowering that also test something meaningful
w/o just cementing the implementation.
R=jarin@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2292463002
Cr-Commit-Position: refs/heads/master@{#38970}
Introduce a new TypedOptimization reducer that contains the type
based optimization reduction steps, which are not (directly)
related to lowering JavaScript operators based on types (which is
what JSTypedLowering is supposed to do).
This also addresses a chicken-and-egg problem that we see in the
Octane/Mandreel benchmark where type based constant folding isn't
applied to the numeric comparison operators introduced by the
JSTypedLowering itself, and thus gives up to 10% speedup for the
benchmark.
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2280673003
Cr-Commit-Position: refs/heads/master@{#38928}
This introduces appropriate unit tests to ensure that merging of
elements/fields information is correct for diamonds.
BUG=chromium:639210,v8:5266
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2278043002
Cr-Commit-Position: refs/heads/master@{#38881}
For O instanceof C, we only need to check the instance type while
iterating the prototypes of O instead of checking both the instance
type and the access check bit of the map. This is because we have
the explicit range of "special object types", which include both
JSProxy as well as the global object and proxy and all API objects
that might have access checks or interceptors. Also restructure the
loop exits somewhat to ensure that the branch cloning gets a chance
to actually eliminate the bit materialization for the results.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2263273003
Cr-Commit-Position: refs/heads/master@{#38860}
Rebuilding (after touching certain files) is crazy slow because
includes are out of control.
Fixing it:
- Don't include stuff in headers unless necessary.
- Include the stuff you need, not some other stuff that happens to include the
stuff you need.
BUG=v8:5294
Review-Url: https://codereview.chromium.org/2268303002
Cr-Commit-Position: refs/heads/master@{#38818}
Port 28e3467a72 (r38361)
original commit message:
Adding new methods to the code stub assembler and interpreter
assembler to combine loading and untagging SMIs, so that on 64-bit
architectures we can avoid loading the full 64 bits and load the
32 interesting bits directly instead.
BUG=
Review-Url: https://codereview.chromium.org/2265043002
Cr-Commit-Position: refs/heads/master@{#38811}
Use bool is_strict_ to encode language_mode in scopes using a single bit.
BUG=
Review-Url: https://codereview.chromium.org/2261463002
Cr-Commit-Position: refs/heads/master@{#38724}
We were missing this optimization in a few cases because TruncateInt64ToInt32 was also interfering.
Also removed the equivalent from simplified-lowering.cc, as the arm64 instruction selector has a similar optimization.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2252333002
Cr-Commit-Position: refs/heads/master@{#38711}
This adds a very first version of inlined Array.prototype.pop into
TurboFan optimized code. We currently limit the inlining to fast
object or smi elements, until the unclear situation around hole NaNs
is resolved and we have a clear semantics inside the compiler.
It's also probably overly defensive in when it's safe to inline
the call to Array.prototype.pop, but we can always extend that
later once we have sufficient trust in the implementation and see
an actual need to extend it.
BUG=v8:2229,v8:3952,v8:5267
R=epertoso@chromium.org
Review-Url: https://codereview.chromium.org/2239703002
Cr-Commit-Position: refs/heads/master@{#38578}
These places were found by the trybots.
- regress-crbug-485410
BUG=
Review-Url: https://codereview.chromium.org/2230923002
Cr-Commit-Position: refs/heads/master@{#38572}
When we change representation from Float64 to Tagged and we know that
the input value can never be -0, we don't need to bother introducing
the check for -0 during effect/control linearization.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2231963002
Cr-Commit-Position: refs/heads/master@{#38568}
Reason for revert:
It may or may not have caused a regression in kraken-crypto-ccm.
Original issue's description:
> [turbofan] Reduces x << y ^ x >>> (32 - y) to x ror (32 - y).
>
> The MachineOperatorReducer was only reducing word32 expressions of the type x << y | x >>> (32 - y) (and variants) to the equivalent Word32Ror. This CL applies the same pattern-matching logic to Word32Xor.
>
> BUG=
>
> Committed: https://crrev.com/a86397d890d3caa01a947e2a6e71beb1f58e6e6b
> Cr-Commit-Position: refs/heads/master@{#38284}
TBR=bmeurer@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
NOPRESUBMIT=true
BUG=
Review-Url: https://codereview.chromium.org/2230213002
Cr-Commit-Position: refs/heads/master@{#38545}
This allows us to consume the type hints gathered by the CompareIC
for the strict equality and inequality operators. Similar to abstract
equality We need to distinguish Number and NumberOrOddball feedback,
as strict equality doesn't truncate Oddball to Number.
R=epertoso@chromium.org
BUG=v8:4583
Review-Url: https://codereview.chromium.org/2222993003
Cr-Commit-Position: refs/heads/master@{#38438}
This CL changes the semantics of FloatXXSub to match the semantics of
the semantics of FloatXXSubPreserveNan. Therefore there is no need
anymore for the FloatXXSubPreserveNan operators.
The optimizations in VisitFloatXXSub which are removed in this CL have
already been moved to machine-operator-reducer.cc in
https://codereview.chromium.org/2226663002R=bmeurer@chromium.org
Review-Url: https://codereview.chromium.org/2220973002
Cr-Commit-Position: refs/heads/master@{#38437}
Up until now "-0.0 - x" was lowered in the instruction selector. I moved
the lowering now to the MachineOperatorReducer.
I did not remove the lowering from the instruction selector yet, I would
prefer to do that in a separate CL.
R=bmeurer@chromium.org
Review-Url: https://codereview.chromium.org/2226663002
Cr-Commit-Position: refs/heads/master@{#38417}
Introduce a dedicated NumberOperationHint enum that represents the
feedback we can use for speculative number operations.
BUG=v8:4930
Review-Url: https://codereview.chromium.org/2220573002
Cr-Commit-Position: refs/heads/master@{#38411}
This extends JSNativeContextSpecialization with support for stores to
fast object/smi element backing stores that are marked as copy-on-write.
In this case we first call the CopyFixedArray builtin to take a copy of
the elements backing store, and then store the new elements back to the
object, and finally perform the actual element store.
R=epertoso@chromium.org
BUG=v8:4470
Committed: https://crrev.com/ac98ad22f049a59c48387f1bab1590f135d219c6
Review-Url: https://codereview.chromium.org/2218703003
Cr-Original-Commit-Position: refs/heads/master@{#38370}
Cr-Commit-Position: refs/heads/master@{#38392}
Before this change we would first load an 8/16/32-bit value from memory into a 32-bit register, then zero/sign-extend from that register to a 64-bit one. Now we replace that pattern with a single movsx/movzx.
Ported from http://crrev.com/2183923003R=bmeurer@chromium.org
Review-Url: https://codereview.chromium.org/2220483003
Cr-Commit-Position: refs/heads/master@{#38388}
Reason for revert:
Breaks tree?
Original issue's description:
> [turbofan] Add support for copy-on-write element stores.
>
> This extends JSNativeContextSpecialization with support for stores to
> fast object/smi element backing stores that are marked as copy-on-write.
> In this case we first call the CopyFixedArray builtin to take a copy of
> the elements backing store, and then store the new elements back to the
> object, and finally perform the actual element store.
>
> R=epertoso@chromium.org
> BUG=v8:4470
>
> Committed: https://crrev.com/ac98ad22f049a59c48387f1bab1590f135d219c6
> Cr-Commit-Position: refs/heads/master@{#38370}
TBR=epertoso@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4470
Review-Url: https://codereview.chromium.org/2220513002
Cr-Commit-Position: refs/heads/master@{#38376}
This extends JSNativeContextSpecialization with support for stores to
fast object/smi element backing stores that are marked as copy-on-write.
In this case we first call the CopyFixedArray builtin to take a copy of
the elements backing store, and then store the new elements back to the
object, and finally perform the actual element store.
R=epertoso@chromium.org
BUG=v8:4470
Review-Url: https://codereview.chromium.org/2218703003
Cr-Commit-Position: refs/heads/master@{#38370}
Adding new methods to the code stub assembler and interpreter
assembler to combine loading and untagging SMIs, so that on 64-bit
architectures we can avoid loading the full 64 bits and load the
32 interesting bits directly instead.
Review-Url: https://codereview.chromium.org/2183923003
Cr-Commit-Position: refs/heads/master@{#38361}
The MachineOperatorReducer was only reducing word32 expressions of the type x << y | x >>> (32 - y) (and variants) to the equivalent Word32Ror. This CL applies the same pattern-matching logic to Word32Xor.
BUG=
Review-Url: https://codereview.chromium.org/2199323003
Cr-Commit-Position: refs/heads/master@{#38284}
This removes the frame state input representing the before-state from
nodes having any int32 bitwise operator. Lowering that inserts number
conversions of the inputs has to be disabled when deoptimization is
enabled, because the frame state layout is no longer known.
R=epertoso@chromium.org
BUG=v8:5021,v8:4746
Review-Url: https://codereview.chromium.org/2194383004
Cr-Commit-Position: refs/heads/master@{#38280}
This completely removes translation of exception handler predictions
from the graph IR. We now rely on the runtime using deoptimization
infomation via {FrameSummary} for predictions in optimized code.
R=bmeurer@chromium.org
Review-Url: https://codereview.chromium.org/2207533002
Cr-Commit-Position: refs/heads/master@{#38250}
This removes the frame state input representing the before-state from
nodes having any shift operator. Any lowering that woult insert number
conversions of the inputs has already been disabled when deoptimization
is enabled, because the frame state layout is no longer known.
R=epertoso@chromium.org
BUG=v8:5021
Review-Url: https://codereview.chromium.org/2190743003
Cr-Commit-Position: refs/heads/master@{#38194}
Drive-by fix: actually match the hint in the IsSpeculativeBinopMatcher.
Review-Url: https://codereview.chromium.org/2191883002
Cr-Commit-Position: refs/heads/master@{#38176}
