The three different concerns that the ControlReducer used to deal with
are now properly separated into
a.) DeadCodeElimination, which is a regular AdvancedReducer, that
propagates Dead via control edges,
b.) CommonOperatorReducer, which does strength reduction on common
operators (i.e. Branch, Phi, and friends), and
c.) GraphTrimming, which removes dead->live edges from the graph.
This will make it possible to run the DeadCodeElimination together with
other passes that actually introduce Dead nodes, i.e. typed lowering;
and it opens the door for general inlining without two stage fix point
iteration.
To make the DeadCodeElimination easier and more uniform, we basically
reverted the introduction of DeadValue and DeadEffect, and changed the
Dead operator to produce control, value and effect. Note however that
this is not a requirement, but merely a way to make dead propagation
easier and more uniform. We could always go back and decide to have
different Dead operators if some other change requires that.
Note that there are several additional opportunities for cleanup now,
i.e. OSR deconstruction could be a regular reducer now, and we don't
need to use TheHole as dead value marker in the GraphReducer. And we can
actually run the dead code elimination together with the other passes
instead of using separate passes over the graph. We will do this in
follow up CLs.
R=jarin@chromium.org, mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/1193833002
Cr-Commit-Position: refs/heads/master@{#29146}
This turns the CommonOperatorReducer into an AdvancedReducer and makes
it independent of JSGraph (which was used only because it was convienent),
and let's the CommonOperatorReducer run together with the ControlReducer.
The ControlReducer is still not able to run together with other reducers,
but we're getting closer. The plan is to split the ControlReducer into
two parts: The dead code elimination part and the common operator
reduction part. This separation will help to avoid tricky bugs in the
future and should make testing a *lot* easier.
R=jarin@chromium.org
Review URL: https://codereview.chromium.org/1192063002
Cr-Commit-Position: refs/heads/master@{#29105}
The condition of a Branch or Select can never be a NumberConstant,
because the resulting graph would be invalid, so we don't need to
optimize this case. It can only ever be a tagged boolean or an untagged
bit.
Drive-by-fix: Test the interesting cases in the unit tests instead.
R=jarin@chromium.org
Review URL: https://codereview.chromium.org/1195443004
Cr-Commit-Position: refs/heads/master@{#29089}
Up until now that was still mixed with control reduction in the
ControlReducer. This separation allows us to remove the horrible
Reducer::Finish hack and also do graph trimming at more appropriate
places in the pipeline (i.e. trim dead nodes after generic lowering,
which can also make nodes dead).
R=jarin@chromium.org,mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/1188433010
Cr-Commit-Position: refs/heads/master@{#29077}
This ensures there is a lazy bailout point at the entry of every
exception handler so that deoptimized code is not re-entered through
caught exceptions.
R=jarin@chromium.org
TEST=cctest/test-run-deopt/DeoptExceptionHandler
Review URL: https://codereview.chromium.org/1173253004
Cr-Commit-Position: refs/heads/master@{#29061}
Up until now we used int32_t for NodeId, but that was not ideal because
negative values are invalid for NodeId and we use it as an array index
for example in the NodeMarker class, where C++ compilers on x64 have to
generate code that does proper sign extension for the indices, which is
completely unnecessary.
R=svenpanne@chromium.org
Review URL: https://codereview.chromium.org/1178403004
Cr-Commit-Position: refs/heads/master@{#28997}
Frame Elider requires a sane CFG which should have such dummy end block.
BUG=
Review URL: https://codereview.chromium.org/1166293004
Cr-Commit-Position: refs/heads/master@{#28911}
Up until now we can only inline based on JSFunction, because of the way
the deoptimization works. With this change we will be able to inline
based on the SharedFunctionInfo and materialize the JSFunction from a
literal or a stack slot when necessary.
R=jarin@chromium.org
Review URL: https://codereview.chromium.org/1169103004
Cr-Commit-Position: refs/heads/master@{#28906}
This adds some basic tests of the interaction between try-catch and
try-finally statements and OSR in TurboFan. The try-osr test suite
follows the structure of try-deopt closely.
R=titzer@chromium.org
TEST=mjsunit/compiler/try-osr
Review URL: https://codereview.chromium.org/1165103003
Cr-Commit-Position: refs/heads/master@{#28855}
This allows try-catch and try-finally constructs to be separately
enabled and disabled. We plan to stage try-catch support soon.
R=titzer@chromium.org
Review URL: https://codereview.chromium.org/1157863015
Cr-Commit-Position: refs/heads/master@{#28848}
This allows any AdvancedReducer to remove exception projections from
graphs. This is the common case when JS-operators are being replaced
with pure values. The old NodeProperties::ReplaceWithValue is being
deprecated in favor of AdvancedReducer::ReplaceWithValue.
R=titzer@chromium.org
TEST=unittests/AdvancedReducerTest
Review URL: https://codereview.chromium.org/1168693002
Cr-Commit-Position: refs/heads/master@{#28810}
Unfortunately StringAdd is not pure in V8 because we might throw an
exception if the resulting string length is outside the valid bounds, so
there's no point in having a simplified StringAdd operator.
R=jarin@chromium.org
Review URL: https://codereview.chromium.org/1164743002
Cr-Commit-Position: refs/heads/master@{#28747}
When compiling on a laptop I like to concatenate the small test files.
This makes a big difference to compile times. These changes make that
easier.
R=ulan@chromium.org
BUG=
Review URL: https://codereview.chromium.org/1163803002
Cr-Commit-Position: refs/heads/master@{#28742}
This simplifies inlining, in that we only need to update uses of Start
and inputs of End instead of walking the whole inlinee to update all
outer frame states.
R=mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/1146403008
Cr-Commit-Position: refs/heads/master@{#28649}
This way we don't need to connect (potentially) non-terminating loops
later during control reduction, which saves one forward pass over the
control graph. Long term we will move the trimming functionality of
the control reducer to the GraphReducer, and get rid of the Finish
method again.
As a bonus, this change also properly rewires Terminate, Throw and
Deoptimize during inlining.
R=mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/1155683004
Cr-Commit-Position: refs/heads/master@{#28625}
This simplifies the handling of the End node. Based on this CL we will
finally fix terminating every loop from the beginning (via Terminate
nodes) and fix inlining of Throw, Deoptimize and Terminate.
R=mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/1157023002
Cr-Commit-Position: refs/heads/master@{#28620}
This reduces the storage per-Node storage from 7 words to 6 and per-edge
storage from 6 words to 4.
On average this is about 10%-15% space savings over the whole graph.
Remove the use of std::deque as the out-of-line storage for inputs.
Reduce size of Use links and use pointer arithmetic to find Node
from Use.
R=mstarzinger@chromium.org,jarin@chromium.org
BUG=
Review URL: https://codereview.chromium.org/1150923003
Cr-Commit-Position: refs/heads/master@{#28583}
Currently the stub simply calls out to the runtime, this will be
improved in a later CLs. The current state at least avoids bit-rot and
later merging horror.
Fixes frame construction logic for stubs, too, and contains quite a few
tiny cleanups in stub-land.
Review URL: https://codereview.chromium.org/1150673002
Cr-Commit-Position: refs/heads/master@{#28555}
Replace the --turbo-deoptimization flag with --turbo-asm-deoptimization
and enable deoptimization for non-asm.js TurboFan code unconditionally.
R=jarin@chromium.org
Review URL: https://codereview.chromium.org/1153483002
Cr-Commit-Position: refs/heads/master@{#28543}
This in turn allows usage of AdvancedReducer::ReplaceWithValue which
has access to the underlying graph reducer. It will allow us to deal
with exception continuations correctly.
R=titzer@chromium.org
Review URL: https://codereview.chromium.org/1134303003
Cr-Commit-Position: refs/heads/master@{#28468}
When the page is controlled by a ServiceWorker, the ServiceWorker can return an opaque (non-CORS cross origin) resource response.
We need to treat the messages from such script resource as opaque.
Committed: https://crrev.com/7a599c5e1242d3c5ab7515ee149623da90ae69ec
Cr-Commit-Position: refs/heads/master@{#28445}
Review URL: https://codereview.chromium.org/1140673002
Cr-Commit-Position: refs/heads/master@{#28459}
When the page is controlled by a ServiceWorker, the ServiceWorker can return an opaque (non-CORS cross origin) resource response.
We need to treat the messages from such script resource as opaque.
Review URL: https://codereview.chromium.org/1140673002
Cr-Commit-Position: refs/heads/master@{#28445}
Implements the strong mode proposal's restrictions on implicit conversions
for the binary >, >=, <, and <= operators.
BUG=v8:3956
LOG=N
Review URL: https://codereview.chromium.org/1130283002
Cr-Commit-Position: refs/heads/master@{#28370}
This stub will be used as the basis of a Math.floor-specific CallIC to
detect and track calls to floor that return -0.
Along the way:
- Create a TurboFanCodeStub super class from which the StringLength and
MathRound TF stubs derive.
- Fix the ugly hack that passes the first stub parameter as the "this"
pointer in the the TF-compiled JS function.
- Fix bugs in the ia32/x64 disassembler.
Review URL: https://codereview.chromium.org/1137703002
Cr-Commit-Position: refs/heads/master@{#28339}
An AdvancedReducer is basically a regular Reducer with an editor
that can perform graph editing operations beyond changing or
replacing the node that is currently being reduced. The GraphReducer
is the default implementation of the AdvancedReducer::Editor interface.
The ControlReducerImpl is now just an AdvancedReducer, which
temporarily requires a Finish method in the reducer to implement
the dead node trimming until we move that to the GraphReducer
(which in turn requires that all loops are connected to End).
Review URL: https://codereview.chromium.org/1122423003
Cr-Commit-Position: refs/heads/master@{#28251}
"RunAllocate" test case is added in d6945db7. it invokes Linkage::GetStubCallDescriptor
which is unimplemented for turbofan unsupported platform.
BUG=
Review URL: https://codereview.chromium.org/1129483003
Cr-Commit-Position: refs/heads/master@{#28244}
This introduces a simplified allocation operator which can be used to
model inline allocations in TurboFan. It is currently used for context
allocations, but still disabled because change lowering introduces
floating allocations outside the effect chain that interfere.
R=bmeurer@chromium.org
Review URL: https://codereview.chromium.org/1109773002
Cr-Commit-Position: refs/heads/master@{#28195}
