If both inputs to JSStrictEqual/JSStrictNotEqual are unique values (i.e.
values with a canonical representation), we can lower the comparison to
ReferenceEqual instead of StringEqual or CompareIC.
Review URL: https://codereview.chromium.org/1154303002
Cr-Commit-Position: refs/heads/master@{#28646}
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}
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/1134663006
Cr-Commit-Position: refs/heads/master@{#28485}
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}
Enable clang's shorten-64-to-32 warning flag on ARM64, and fix the warnings
that arise.
BUG=
Review URL: https://codereview.chromium.org/1131573006
Cr-Commit-Position: refs/heads/master@{#28412}
Use these check points to optimize comparisons where we already know
that one side cannot be a String (or turn into a string via
ToPrimitive).
Also remove bunch of useless DoNotCrash tests for the scheduler that are
painful to maintain and add almost no value.
R=jarin@chromium.org
Review URL: https://codereview.chromium.org/1140583004
Cr-Commit-Position: refs/heads/master@{#28383}
Note that this is just a duplication for now. We'll want to get rid of the
NodeProperties::ReplaceWithValue() method in the long run.
R=bmeurer@chromium.org
BUG=
Review URL: https://codereview.chromium.org/1135483004
Cr-Commit-Position: refs/heads/master@{#28363}
Select sbfx for ((x << k) >> k) in ARM64 instruction selector, and similarly
for ubfx. This is a more generic version of the previous sxtb/h selector.
BUG=
Review URL: https://codereview.chromium.org/1135543002
Cr-Commit-Position: refs/heads/master@{#28318}
This revives the Terminate operator and removes the weird Always
operator. As a first step we let the ControlReducer connect non
terminating loops via Terminate. The next step will be to change the
graph builder to insert Terminate nodes into every loop.
Review URL: https://codereview.chromium.org/1123213002
Cr-Commit-Position: refs/heads/master@{#28259}
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}
Tail calls are matched on the graph, with a dedicated tail call
optimization that is actually testable. The instruction selection can
still fall back to a regular if the platform constraints don't allow to
emit a tail call (i.e. the return locations of caller and callee differ
or the callee takes non-register parameters, which is a restriction that
will be removed in the future).
Also explicitly limit tail call optimization to stubs for now and drop
the global flag.
BUG=v8:4076
LOG=n
Review URL: https://codereview.chromium.org/1114163005
Cr-Commit-Position: refs/heads/master@{#28219}
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}
This CL contains the first steps towards tail call optimization:
* Structurally detect tail calls during instruction selection,
looking for special return/call combinations.
* Added new architecture-specific instructions for tail calls which
jump instead of call and take care of frame adjustment.
* Moved some code around.
Currently we restrict tail calls to callees which only use registers
for arguments/return value and to call sites which are explicitly
marked as being OK for tail calls. This excludes, among other things,
call sites in sloppy JS functions and our IC machinery (both need in
general to be able to access the caller's frame).
All this is behind a flag --turbo-tail-calls, which is currently off
by default, so it can easily be toggled.
Review URL: https://codereview.chromium.org/1108563002
Cr-Commit-Position: refs/heads/master@{#28150}
- allows the optimization of emitted gap move code since the representation of the value in the register is known
- necessary preparation for vector register allocation
- prepare for slot sharing for any value of the same byte width
TBR=jarin@chromium.org
BUG=
Review URL: https://codereview.chromium.org/1111323003
Cr-Commit-Position: refs/heads/master@{#28140}
- allows the optimization of emitted gap move code since the representation of the value in the register is known
- necessary preparation for vector register allocation
- prepare for slot sharing for any value of the same byte width
BUG=
Review URL: https://codereview.chromium.org/1087793002
Cr-Commit-Position: refs/heads/master@{#28137}
These two test cases "InlineCreateArrayLiteral" and "InlineCreateObjectLiteral" are
added in d1597b7d22. They invokes Linkage::GetStubCallDescriptor
which is unimplemented for turbofan unsupported platform.
BUG=
Review URL: https://codereview.chromium.org/1095793007
Cr-Commit-Position: refs/heads/master@{#28090}
This uses explicit operators instead of intrinsic runtime calls to
create literals froms boilerplates. It allows for easier access of
static parameters and syncs it with other allocating operators.
R=svenpanne@chromium.org
Review URL: https://codereview.chromium.org/1104453006
Cr-Commit-Position: refs/heads/master@{#28062}
This introduces a JSCreateClosure operator which can be lowered by the
typed pipeline to the aforementioned stub. It also allows for further
optimizations of closure creation.
R=titzer@chromium.org
Review URL: https://codereview.chromium.org/1105513002
Cr-Commit-Position: refs/heads/master@{#28058}
Implements the strong mode proposal's restrictions on
implicit conversions for binary arithmetic operations, not
including the + special case. Adds some infrastructure
for future implementation of the restrictions for other
operators.
BUG=v8:3956
LOG=N
Review URL: https://codereview.chromium.org/1092353002
Cr-Commit-Position: refs/heads/master@{#28045}
Now all nodes that care about deoptimization always take frame state
inputs no matter whether deoptimization is enabled for a particular
function. In case that deoptimization is off, the AstGraphBuilder just
inserts the empty frame state. This greatly simplifies the logic in
various places and makes testing easier as well, and is probably the
first step towards enabling --turbo-deoptimization by default.
There seems to be no noticable performance impact on asm.js programs.
Also fix the graph replay in order to regenerate the scheduler unittests.
Review URL: https://codereview.chromium.org/1106613003
Cr-Commit-Position: refs/heads/master@{#28026}
This allows the JSIntrinsicLowering to optimize the cloning of literal
boilerplate objects using either the FastCloneShallowArrayStub or the
FastCloneShallowObjectStub when applicable.
R=mvstanton@chromium.org
Review URL: https://codereview.chromium.org/1097963002
Cr-Commit-Position: refs/heads/master@{#27974}
- make ParallelMove into a ZoneVector, removing an annoying level of indirection
- make MoveOperands hold InstructionOperands instead of pointers, so there's no more operand aliasing for moves
- opens up possibility of storing MachineType in allocated operands
R=bmeurer@chromium.org
BUG=
Review URL: https://codereview.chromium.org/1081373002
Cr-Commit-Position: refs/heads/master@{#27842}
Currently we always generate a diamond in the graph builder for every
legacy const context slot, which we cannot get rid of until late control
reduction, even if we know after context specialization that the slot is
already initialized.
Now we generate a select instead, which the CommonOperatorReducer
happily removes during typed lowering. This greatly speeds up asm.js
code generated by Emscripten with the new POINTER_MASKING mode.
R=mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/1072353002
Cr-Commit-Position: refs/heads/master@{#27739}
- ConstantOperand was using a too-small field too store its virtual register
- drop ConvertTo, replace it with simple copy
- split AllocatedOperand off from Immediate and Constant to make assignment clearer, also paving the way for small Immediates
- put zone first in *Operand::New
- driveby: drop delayed ssa deconstruction experiment
R=titzer@chromium.org
BUG=
Review URL: https://codereview.chromium.org/1050803002
Cr-Commit-Position: refs/heads/master@{#27692}
