Reason for revert:
failing tests
Original issue's description:
> Replace all remaining Oddball checks with new function
>
> This CL removes the IsUndefined() and Co. methods from Object and HeapObject.
> The new method all take the isolate as parameter.
>
> BUG=
>
> Committed: https://crrev.com/ccefb3ae5fe967288d568013fb04e8761eafebc5
> Cr-Commit-Position: refs/heads/master@{#36921}
TBR=mstarzinger@chromium.org,verwaest@chromium.org,yangguo@chromium.org,ahaas@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=
Review-Url: https://codereview.chromium.org/2060213002
Cr-Commit-Position: refs/heads/master@{#36923}
This CL removes the IsUndefined() and Co. methods from Object and HeapObject.
The new method all take the isolate as parameter.
BUG=
Review-Url: https://codereview.chromium.org/2043183003
Cr-Commit-Position: refs/heads/master@{#36921}
Import base::ieee754::atan() and base::ieee754::atan2() from fdlibm and
introduce Float64Atan and Float64Atan2 TurboFan operators based on those,
similar to what we already did for Float64Log and Float64Log1p. Rewrite
Math.atan() and Math.atan2() as TurboFan builtin and use the operators
to also inline Math.atan() and Math.atan2() into optimized TurboFan functions.
R=yangguo@chromium.org
BUG=v8:5086,v8:5095
Review-Url: https://codereview.chromium.org/2065503002
Cr-Commit-Position: refs/heads/master@{#36916}
Import base::ieee754::log1p() from fdlibm and introduce a Float64Log1p
TurboFan operator based on that, similar to what we do for Float64Log.
Rewrite Math.log1p() as TurboFan builtin and use that operator to also
inline Math.log1p() into optimized TurboFan functions.
Also unify the handling of the special IEEE 754 functions somewhat in
the TurboFan backends. At some point we can hopefully express this
completely in the InstructionSelector (once we have an idea what to do
with the ST(0) return issue on IA-32/X87).
Drive-by-fix: Add some more test coverage for the log function.
R=yangguo@chromium.org
BUG=v8:5086,v8:5092
Review-Url: https://codereview.chromium.org/2060743002
Cr-Commit-Position: refs/heads/master@{#36914}
We were able to achieve our goals for register allocation independent of
the allocation algorithm. Performance data so far is inconclusive re. the
value of the Greedy algorithm, compared to the particular Linear Scan
implementation we're currently using, and the performance measurement
techniques we currently use are too imprecise to help with this matter.
Retiring the algorithm to lower maintenance and evolution cost (e.g. lower
cost of adding aliasing support). Once we improve benchmarking stability,
and establish a suite sensitive enough for codegen improvement studies,
we may revive the algorithm, should the need arise.
BUG=
Review-Url: https://codereview.chromium.org/2060673002
Cr-Commit-Position: refs/heads/master@{#36912}
This should solve the problem with missing checkpoints after JSToNumber
(PlainPrimitiveToNumber is marked no-write, so the frame-state
propagation should see through it.)
Unfortunately, this also duplicates the word32- and float64-truncation
magic that we have for JSToNumber in "simplified lowering".
Review-Url: https://codereview.chromium.org/2059653002
Cr-Commit-Position: refs/heads/master@{#36881}
This switches Math.log to use an fdlibm based version of log, imported
as base::ieee754::log, and use that consistently everywhere, i.e. change
the Float64Log TurboFan operators on Intel to use the C++ implementation
as well (same for Crankshaft).
R=yangguo@chromium.org
BUG=v8:5065,v8:5086
Review-Url: https://codereview.chromium.org/2053893003
Cr-Commit-Position: refs/heads/master@{#36880}
Ideally we would have a dedicated MachineRepresentation for Smis during
representation selection and use that to properly optimize ObjectIsSmi
(and other ObjectIs<Type> predicates), but that will take some time to
get that done. So in the meantime we can just do simple (local) strength
reduction on ObjectIsSmi to avoid Smi checks in the simplest cases at
least.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2047213002
Cr-Commit-Position: refs/heads/master@{#36809}
Passing in the isolate and pointer compare the instnance against the
corresponding constant is always faster than decoding the instance types.
BUG=
Review-Url: https://codereview.chromium.org/2028983002
Cr-Commit-Position: refs/heads/master@{#36744}
This is mostly about DCHECKs. Enabling some requires a few
changes to tests that were not careful about types.
BUG=
Review-Url: https://codereview.chromium.org/2033703002
Cr-Commit-Position: refs/heads/master@{#36734}
This moves processing of jumps out of bytecode array builder and into
bytecode array writer. This simplifies the pipeline by avoiding having
to flush for offset and patch up offsets in bytecode array builder based
on what was emitted by the bytecode array writer.
This also enables future refactorings to add dead code elimination back
into the pipeline, and move processing of scalable operand sizes to the
end of the pipeline (in the bytecode array writer) rather than having to
deal with scalable operand types throughout pipeline.
BUG=v8:4280,chromium:616064
Review-Url: https://codereview.chromium.org/2035813002
Cr-Commit-Position: refs/heads/master@{#36716}
- Adds names for float registers to RegisterConfiguration and uses them
when we have the MachineRepresentation.
LOG=N
BUG=v8:4124
Review-Url: https://codereview.chromium.org/2030143002
Cr-Commit-Position: refs/heads/master@{#36712}
These speculative binary operators are simplified operators and should
not need a frame state themselves. These eager bailout points can by now
be found via checkpoints in the graph, whereas frame states attached to
nodes directly should always represent lazy bailout points.
R=jarin@chromium.org
BUG=v8:5021
Review-Url: https://codereview.chromium.org/2037673002
Cr-Commit-Position: refs/heads/master@{#36705}
Introduce a dedicated Float64Log machine operator, that is either
implemented by a direct C call or by platform specific code, i.e.
using the FPU on x64 and ia32.
This operator is used to implement Math.log as a proper TurboFan
builtin on top of the CodeStubAssembler.
Also introduce a NumberLog simplified operator on top of Float64Log
and use that for the fast inline path of Math.log inside TurboFan
optimized code.
BUG=v8:5065
Review-Url: https://codereview.chromium.org/2029413005
Cr-Commit-Position: refs/heads/master@{#36703}
This removes the frame state input representing the before-state from
nodes performing property accesses. These frame states can by now be
found via checkpoints in the graph.
R=jarin@chromium.org
BUG=v8:5021
Review-Url: https://codereview.chromium.org/2034673002
Cr-Commit-Position: refs/heads/master@{#36699}
A value in unittests/Bytecodes.DecodeBytecodeAndOperands was 16 bit
instead of 8 bit. This was causing test to fail on big endian machines.
BUG=
Review-Url: https://codereview.chromium.org/2030063002
Cr-Commit-Position: refs/heads/master@{#36698}
VC++ complains about truncation of integer constants despite use of
static_cast. This isn't very helpful as it gives no way of suppressing
the warning in code, so this change suppresses it on the command line.
Additionally, the linker complains about importing of locally defined
functions in component builds. Until this is fixed the warnings should
be suppressed.
NOTRY=true
Review-Url: https://codereview.chromium.org/2028353004
Cr-Commit-Position: refs/heads/master@{#36695}
This introduces optimized number operations based on type feedback.
Summary of changes:
1. Typed lowering produces SpeculativeNumberAdd/Subtract for JSAdd/Subtract if
there is suitable feedback. The speculative nodes are connected to both the
effect chain and the control chain and they retain the eager frame state.
2. Simplified lowering now executes in three phases:
a. Propagation phase computes truncations by traversing the graph from uses to
definitions until checkpoint is reached. It also records type-check decisions
for later typing phase, and computes representation.
b. The typing phase computes more precise types base on the speculative types (and recomputes
representation for affected nodes).
c. The lowering phase performs lowering and inserts representation changes and/or checks.
3. Effect-control linearization lowers the checks to machine graphs.
Notes:
- SimplifiedLowering will be refactored to have handling of each operation one place and
with clearer input/output protocol for each sub-phase. I would prefer to do this once
we have more operations implemented, and the pattern is clearer.
- The check operations (Checked<A>To<B>) should have some flags that would affect
the kind of truncations that they can handle. E.g., if we know that a node produces
a number, we can omit the oddball check in the CheckedTaggedToFloat64 lowering.
- In future, we want the typer to reuse the logic from OperationTyper.
BUG=v8:4583
LOG=n
Review-Url: https://codereview.chromium.org/1921563002
Cr-Commit-Position: refs/heads/master@{#36674}
This removes the frame state input representing the before-state from
nodes having the {JSCallFunction} or {JSCallConstruct} operator. These
frame states can by now be found via checkpoints in the graph.
R=bmeurer@chromium.org
BUG=v8:5021
Review-Url: https://codereview.chromium.org/2025573003
Cr-Commit-Position: refs/heads/master@{#36669}
We use StringFromCharCode to optimize calls to String.fromCharCode with
a single Number argument for now. We will use it to also implement the
charAt method on the String prototype.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2037453003
Cr-Commit-Position: refs/heads/master@{#36668}
We already implemented CPU time for OS X and POSIX, this path is a
follow up for the implementation on Windows.
BUG=v8:5000
LOG=n
Review-Url: https://codereview.chromium.org/1977983003
Cr-Commit-Position: refs/heads/master@{#36656}
A few values were missing use of a macro causing test to fail on big
endian machines.
BUG=
Review-Url: https://codereview.chromium.org/2024123002
Cr-Commit-Position: refs/heads/master@{#36645}
This adds a very simplistic reduction of {CheckPoint} nodes via the new
{CheckpointElimination}, eliminating redundant check points that appear
in an effect chain of operations that are all {kNoWrite}. Such a chain
allows an arbitrary check point to be chosen. The current approach will
end up choosing the first one for all deopts in the chain.
R=bmeurer@chromium.org
TEST=unittests/CheckpointEliminationTest.CheckPointChain
BUG=v8:5021
Review-Url: https://codereview.chromium.org/2022913003
Cr-Commit-Position: refs/heads/master@{#36634}
This patch enables the following transformations in the instruction
selector:
| Before | After |
|------------------+------------------------|
| and x3, x1, #0x1 | tb{,n}z w1, #0, #+0x78 |
| cmp x3, #0x0 | |
| b.{eq,ne} #+0x80 | |
|------------------+------------------------|
| cmp x0, #0x0 | cb{,n}z x0, #+0x48 |
| b.{eq,ne} #+0x4c | |
I have not seen these patterns beeing generated by turbofan, however the
stubs hit these cases frequently. A particular reason is that we are
turning operations that check for a Smi into a single `tbz`.
As a concequence, the interpreter is affected thanks to inlining
turbofan stubs into it's bytecode handlers. I have noticed the size of
the interpreter was reduced by 200 instructions.
BUG=
Review-Url: https://codereview.chromium.org/2022073002
Cr-Commit-Position: refs/heads/master@{#36632}
Rename some methods to reflect the fact that there are multiple FP
machine representations.
LOG=N
BUG=v8:4124
Review-Url: https://codereview.chromium.org/2013193002
Cr-Commit-Position: refs/heads/master@{#36552}
Adding optional operators for FNeg for WebAssembly, as the current implementation was significantly suboptimal for ARM.
Review-Url: https://codereview.chromium.org/2011303002
Cr-Commit-Position: refs/heads/master@{#36544}
We get less "pollution" of type feedback if we have one vector per native
context, rather than one for the whole system. This CL moves the vector
appropriately.
BUG=
Review-Url: https://codereview.chromium.org/1906823002
Cr-Commit-Position: refs/heads/master@{#36539}
Caching nodes with mutable inputs is a bad idea and already blew up
twice now, so in order to avoid further breakage, let's kill the
EmptyFrameState caching on JSGraph completely and only cache the empty
state values there.
We can remove the hacking from JSTypedLowering completely once we have
the PlainPrimitiveToNumber in action.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2006423003
Cr-Commit-Position: refs/heads/master@{#36511}
This change introduces five fused bytecodes for common bytecode
sequences on popular websites. These are LdrNamedProperty,
LdrKeyedProperty, LdrGlobal, LdrContextSlot, and LdrUndefined. These
load values into a destination register operand instead of the
accumulator. They are emitted by the peephole optimizer.
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/1985753002
Cr-Commit-Position: refs/heads/master@{#36507}
This interpreter directly decodes and executes WASM binary code for
the purpose of supporting low-level debugging. It is not currently
integrated into the main WASM implementation.
R=ahaas@chromium.org,clemensh@chromium.org,rossberg@chromium.org,binji@chromium.org
BUG=
Review-Url: https://codereview.chromium.org/1972153002
Cr-Commit-Position: refs/heads/master@{#36497}
Moved globals offsets calculation to the wasm module decoder, since
this is a property of the module, not of each instance.
Qualified as "const" references to WasmModule outside of the decoder
and some test situations.
BUG=
Review-Url: https://codereview.chromium.org/2005933003
Cr-Commit-Position: refs/heads/master@{#36484}
This fixes the SharedFunctionInfo::num_literals field for global builtin
functions (e.g. {Object} and friends) to be accurate. The field was not
being updated by Runtime_SetCode. It also removes the dangerous and by
now obsolete JSFunction::NumberOfLiterals accessor.
R=mvstanton@chromium.org
Review-Url: https://codereview.chromium.org/2007943002
Cr-Commit-Position: refs/heads/master@{#36480}
This patch is a follow up to https://codereview.chromium.org/1972103002/
adding support for the `Operand_R_LSL_I` addressing mode to loads and
stores for ARM.
Just as the ARM64 implementation, the shift + load/store pattern is only
really relevant to the interpreter. For this reason, this patch does not
add support for the other addressing modes (`R_LSR_I`, `R_ASR_I` and
`R_ROR_I`) as I haven't seen those pattern being generated. Additionally,
the optimization is restricted 32 bit loads and stores.
kind = BYTECODE_HANDLER
name = Star
compiler = turbofan
Instructions (size = 40)
0x22a5f860 0 e2851001 add r1, r5, #1
0x22a5f864 4 e19610d1 ldrsb r1, [r6, +r1]
0x22a5f868 8 e1a0200b mov r2, fp
0x22a5f86c 12 e7820101 str r0, [r2, +r1, lsl #2]
^^^^^^^^^^^^^^^^^^^^^^^^^
0x22a5f870 16 e2855002 add r5, r5, #2
0x22a5f874 20 e7d61005 ldrb r1, [r6, +r5]
0x22a5f878 24 e7981101 ldr r1, [r8, +r1, lsl #2]
^^^^^^^^^^^^^^^^^^^^^^^^^
0x22a5f87c 28 e12fff11 bx r1
BUG=
Review-Url: https://codereview.chromium.org/1974263002
Cr-Commit-Position: refs/heads/master@{#36381}
The MLS instruction is available in all ARMv7 devices, and in no ARMv6
devices, aside from the usual ARMv6T2 caveat. We don't need a separate
feature flag for it.
BUG=
Review-Url: https://codereview.chromium.org/1988133004
Cr-Commit-Position: refs/heads/master@{#36378}
Previously, CodeStubAssembler macros performing FixedArray element accesses had
to compute offsets to elements explicitly with a fair amount of duplicated
code. Furthermore, any peephole optimizations that could produce better code--
like recognizing constant indices or combining array index computation with Smi
untagging--were also duplicated.
This change factors the code to compute FixedArray index offsets into a common
routine in the CodeStubAssembler that applies standard peephole optimizations to
all accesses. In order to do this, it also introduces limited introspection into
the up-until-now opaque Node* type exported from code-assembler.h, allowing
Nodes to be queried whether they are constant and extracting their constant
value in that case.
Review-Url: https://codereview.chromium.org/1989363004
Cr-Commit-Position: refs/heads/master@{#36370}
