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}
This gets rid of the Star bytecodes that were always dispatched to from
ToObject.
ToObject now outputs to register instead of to the accumulator and
ForInPrepare gets the receiver object from an input register.
BUG=v8:4820
LOG=n
Review-Url: https://codereview.chromium.org/2189463006
Cr-Commit-Position: refs/heads/master@{#38177}
Drive-by fix: actually match the hint in the IsSpeculativeBinopMatcher.
Review-Url: https://codereview.chromium.org/2191883002
Cr-Commit-Position: refs/heads/master@{#38176}
Reason for revert:
Still crashing.
Original issue's description:
> [heap] Reland "Remove black pages and use black areas instead."
>
> BUG=chromium:630969,chromium:630386
> LOG=n
>
> Committed: https://crrev.com/9e37a07c8de0a20ef2681e26824ff4d329102603
> Cr-Commit-Position: refs/heads/master@{#38057}
TBR=ulan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:630969,chromium:630386
Review-Url: https://codereview.chromium.org/2183383004
Cr-Commit-Position: refs/heads/master@{#38129}
This patch updates internal data structures used by V8 to support
multiple indirect function tables (WebAssembly/design#682). But, since
this feature is post-MVP, the functionality is not directly exposed and
parsing/generation of WebAssembly is left unchanged. Nevertheless, it
is being used in an experiment to implement fine-grained control flow
integrity based on C/C++ types.
BUG=
Review-Url: https://codereview.chromium.org/2174123002
Cr-Commit-Position: refs/heads/master@{#38110}
This required the introduction of the CheckedNumberOrOddballAsWord32 use info, and a change in the RepresentationChanger to handle it.
BUG=
Review-Url: https://codereview.chromium.org/2184513003
Cr-Commit-Position: refs/heads/master@{#38086}
This is a first step towards a perfect world where a call interface descriptor is the only place that defines calling convention for a particular code stub.
Review-Url: https://codereview.chromium.org/2172223002
Cr-Commit-Position: refs/heads/master@{#38059}
Reason for revert:
Fix has been landed.
Original issue's description:
> Revert of [interpreter] Add explicit OSR polling bytecode. (patchset #6 id:100001 of https://codereview.chromium.org/2172233002/ )
>
> Reason for revert:
> Bunch of breakages. Maybe bad interaction with e520e5da55 ?
>
> E.g.:
> https://build.chromium.org/p/client.v8/builders/V8%20Linux64/builds/11607
>
> Original issue's description:
> > [interpreter] Add explicit OSR polling bytecode.
> >
> > This adds an explicit {OsrPoll} bytecode into every loop header which
> > triggers on-stack replacement when armed. Note that each such bytecode
> > stores the static loop depths as an operand, and hence can be armed for
> > specific loop depths.
> >
> > This also adds builtin code that triggers OSR compilation and switches
> > execution over to optimized code in case compilation succeeds. In case
> > compilation fails, the bytecode dispatch just continues unhindered.
> >
> > R=rmcilroy@chromium.org
> > TEST=mjsunit/ignition/osr-from-bytecode
> > BUG=v8:4764
> >
> > Committed: https://crrev.com/a55beb68e0ededb3773affa294a71edc50621458
> > Cr-Commit-Position: refs/heads/master@{#38043}
>
> TBR=rmcilroy@chromium.org,mstarzinger@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=v8:4764
>
> Committed: https://crrev.com/439aa2c6d708bfd95db725bd6f97c4c49bbc51fc
> Cr-Commit-Position: refs/heads/master@{#38044}
TBR=rmcilroy@chromium.org,machenbach@chromium.org
BUG=v8:4764
Review-Url: https://codereview.chromium.org/2184713002
Cr-Commit-Position: refs/heads/master@{#38056}
Reason for revert:
Bunch of breakages. Maybe bad interaction with e520e5da55 ?
E.g.:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64/builds/11607
Original issue's description:
> [interpreter] Add explicit OSR polling bytecode.
>
> This adds an explicit {OsrPoll} bytecode into every loop header which
> triggers on-stack replacement when armed. Note that each such bytecode
> stores the static loop depths as an operand, and hence can be armed for
> specific loop depths.
>
> This also adds builtin code that triggers OSR compilation and switches
> execution over to optimized code in case compilation succeeds. In case
> compilation fails, the bytecode dispatch just continues unhindered.
>
> R=rmcilroy@chromium.org
> TEST=mjsunit/ignition/osr-from-bytecode
> BUG=v8:4764
>
> Committed: https://crrev.com/a55beb68e0ededb3773affa294a71edc50621458
> Cr-Commit-Position: refs/heads/master@{#38043}
TBR=rmcilroy@chromium.org,mstarzinger@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4764
Review-Url: https://codereview.chromium.org/2184553003
Cr-Commit-Position: refs/heads/master@{#38044}
This adds an explicit {OsrPoll} bytecode into every loop header which
triggers on-stack replacement when armed. Note that each such bytecode
stores the static loop depths as an operand, and hence can be armed for
specific loop depths.
This also adds builtin code that triggers OSR compilation and switches
execution over to optimized code in case compilation succeeds. In case
compilation fails, the bytecode dispatch just continues unhindered.
R=rmcilroy@chromium.org
TEST=mjsunit/ignition/osr-from-bytecode
BUG=v8:4764
Review-Url: https://codereview.chromium.org/2172233002
Cr-Commit-Position: refs/heads/master@{#38043}
ToName was always generated with a subsequent Star, fuse them.
Requires a few changes in the peephole optimizer as ToName cannot be
elided as easily, but must be replaced by Star.
BUG=v8:4280
LOG=n
Review-Url: https://codereview.chromium.org/2169813002
Cr-Commit-Position: refs/heads/master@{#38019}
After multiplying two integers we emit code like:
if (result == 0) {
if (OR_OPERATION(rhs, lhs) < 0) {
DEOPT;
}
}
This CL allows us to eliminate the OR and comparison if either rhs or
lhs is a negative number, reducing the code to:
if (result == 0) DEOPT;
BUG=
Review-Url: https://codereview.chromium.org/2167643002
Cr-Commit-Position: refs/heads/master@{#38016}
Turn the LoadElimination into a proper graph Reducer so that it can run
together with ValueNumbering and RedundancyElimination to a fixpoint
for maximum load/check elimination. This also adds initial support for
eliminating redundant LoadElement/StoreElement nodes.
BUG=v8:4930,v8:5141
Review-Url: https://codereview.chromium.org/2164253002
Cr-Commit-Position: refs/heads/master@{#38015}
Move the logic for allocating the global declaration pair array
from VisitDeclarations to a later step. This is required for
concurrent bytecode generation.
This change requires adding support for reserving fixed
constant pool array entries, which can be later updated
with the value of the literal.
BUG=v8:5203
Review-Url: https://codereview.chromium.org/2167763003
Cr-Commit-Position: refs/heads/master@{#38010}
Introducing machine operators early causes trouble for the typing,
truncation analysis and representation selection, so we should rather
stick to simplified operators instead. Now there's only the for-in case
left, which is not clear how we can handle this in a better way.
Drive-by-fix: Also don't introduce Int32Constant and Word32Shl in
JSTypedLowering, but use NumberConstant and proper NumberShiftLeft
operators instead.
R=jarin@chromium.org
BUG=chromium:630951
Review-Url: https://codereview.chromium.org/2182453002
Cr-Commit-Position: refs/heads/master@{#38008}
Reason for revert:
Suspected to cause crbug.com/630969
Original issue's description:
> [heap] Remove black pages and use black areas instead.
>
> BUG=630386
> LOG=n
>
> Committed: https://crrev.com/b008a0d5a3db80a854cb93d9c94d67bf2d780f2c
> Cr-Commit-Position: refs/heads/master@{#37967}
TBR=ulan@chromium.org,hpayer@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=630386
Review-Url: https://codereview.chromium.org/2176133002
Cr-Commit-Position: refs/heads/master@{#38006}
Implement UnalignedLoad and UnalignedStore optional
turbofan operators and use them in WasmCompiler for unaligned
memory access.
BUG=
Review-Url: https://codereview.chromium.org/2122853002
Cr-Commit-Position: refs/heads/master@{#37988}
ToNumber's result is always directly stored to a register using a Star
bytecode. Fuse it into ToNumber.
BUG=v8:4280
LOG=n
Review-Url: https://codereview.chromium.org/2165953002
Cr-Commit-Position: refs/heads/master@{#37976}
So far we don't have a useful way to inline Math.max or Math.min in
TurboFan optimized code. This adds new operators NumberMax and NumberMin
and changes the Float64Max/Float64Min operators to have JavaScript
semantics instead of the C++ semantics that it had previously.
This also removes support for recognizing the tenary case in the
CommonOperatorReducer, since that doesn't seem to have any positive
impact (and actually doesn't show up in regular JavaScript, where
people use Math.max/Math.min instead).
Drive-by-fix: Also nuke the unused Float32Max/Float32Min operators.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2170343002
Cr-Commit-Position: refs/heads/master@{#37971}
For some bytecodes it is beneficial to always look for a Star
bytecode when dispatching to the next and inline perform it
without dispatching to the Star handler.
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/2142273003
Cr-Commit-Position: refs/heads/master@{#37904}
Add a dedicated simplified operator to inline the general case for the
ToBoolean conversion. In a follow up CL we will also use the ToBoolean
hints gathered by the baseline compiler.
Review-Url: https://codereview.chromium.org/2167593002
Cr-Commit-Position: refs/heads/master@{#37882}
Reason for revert:
This cl causes a large regression in octane (https://chromeperf.appspot.com/group_report?bug_id=629503). I have to investigate the reason before I can reland this.
Original issue's description:
> [Interpreter] Collect type feedback for 'new' in the bytecode handler
>
> Collect type feedback in the bytecode handler for 'new' bytecode. The
> current implementation does not collect allocation site feedback.
>
> BUG=v8:4280, v8:4780
> LOG=N
>
> Committed: https://crrev.com/1eadc76419b323fb2e55ae9953142f801704aa59
> Cr-Commit-Position: refs/heads/master@{#37862}
TBR=rmcilroy@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4280, v8:4780
Review-Url: https://codereview.chromium.org/2165633003
Cr-Commit-Position: refs/heads/master@{#37872}
Original issue's description:
> [interpeter] Move to table based peephole optimizer.
>
> Introduces a lookup table for peephole optimizations.
>
> Fixes some tests using BytecodePeepholeOptimizer::Write() that should
> have been update to use BytecodePeepholeOptimizer::WriteJump().
>
> BUG=v8:4280
> LOG=N
>
> Committed: https://crrev.com/f4234422b93b21a286b0f31799009bcbe8b90b9e
> Cr-Commit-Position: refs/heads/master@{#37819}
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/2164583002
Cr-Commit-Position: refs/heads/master@{#37866}
Collect type feedback in the bytecode handler for 'new' bytecode. The
current implementation does not collect allocation site feedback.
BUG=v8:4280, v8:4780
LOG=N
Review-Url: https://codereview.chromium.org/2153433002
Cr-Commit-Position: refs/heads/master@{#37862}
So far TurboFan wasn't adding the deoptimization reasons for eager/soft
deoptimization exits that can be used by either the DevTools profiler or
the --trace-deopt flag. This adds basic support for deopt reasons on
Deoptimize, DeoptimizeIf and DeoptimizeUnless nodes and threads through
the reasons to the code generation.
Also moves the DeoptReason to it's own file (to resolve include cycles)
and drops unused reasons.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2161543002
Cr-Commit-Position: refs/heads/master@{#37823}
Reason for revert:
Break MIPS port.
Original issue's description:
> [interpeter] Move to table based peephole optimizer.
>
> Introduces a lookup table for peephole optimizations.
>
> Fixes some tests using BytecodePeepholeOptimizer::Write() that should
> have been update to use BytecodePeepholeOptimizer::WriteJump().
>
> BUG=v8:4280
> LOG=N
>
> Committed: https://crrev.com/f4234422b93b21a286b0f31799009bcbe8b90b9e
> Cr-Commit-Position: refs/heads/master@{#37819}
TBR=rmcilroy@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4280
Review-Url: https://codereview.chromium.org/2161563002
Cr-Commit-Position: refs/heads/master@{#37821}
Introduces a lookup table for peephole optimizations.
Fixes some tests using BytecodePeepholeOptimizer::Write() that should
have been update to use BytecodePeepholeOptimizer::WriteJump().
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/2118183002
Cr-Commit-Position: refs/heads/master@{#37819}
This change makes the architecture that we target generated
v8 code for a property of the current toolchain, rather than a
global setting that applies to every toolchain.
This will allow us to properly build two snapshots for two different
architectures in a single build, which is needed for android
webview/monochrome builds.
R=brettw@chromium.org, jochen@chromium.org, michaelbai@chromium.org
BUG=625383
Review-Url: https://codereview.chromium.org/2116913002
Cr-Commit-Position: refs/heads/master@{#37805}
Typed lowering now produces SpeculativeNumberShiftLeft for JSShiftLeft if the type feedback is kSignedSmall or kSigned32.
BUG=v8:4583
LOG=n
Review-Url: https://codereview.chromium.org/2150553002
Cr-Commit-Position: refs/heads/master@{#37762}
Original commit message:
Also, CodeGenerator::MakeCodeEpilogue now accepts an optional pointer
to a EhFrameWriter and will attach unwinding information to the code
object when passed one.
Reason for reverting:
The STATIC_CONST_MEMBER_DEFINITION in eh-frame-writer-unittest.cc
causes a compiler error on V8 Win64 - clang buildbot.
Removing that bit.
BUG=v8:4899
LOG=N
Review-Url: https://codereview.chromium.org/2023503002
Cr-Commit-Position: refs/heads/master@{#37754}
If --turbo-type-feedback is off, the type hints on the operators will
just be kAny, so we don't need to do additional checks in the
JSTypedLowering reducer.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2144203002
Cr-Commit-Position: refs/heads/master@{#37750}
Reason for revert:
Breaks the roll, possibly win gn:
https://codereview.chromium.org/2148863002/
Original issue's description:
> [interpreter] Reduce dependencies in bytecodes.{h,cc}
>
> This CL reduces the number of dependencies bytecodes.{h,cc} to facilitate
> generating the bytecode peephole optimizer table during build. Specifically,
> it avoids depending on v8_base.
>
> BUG=v8:4280
> LOG=N
>
> Committed: https://crrev.com/4edebb1cd870ae6c1359ad54f83e618e185883b1
> Cr-Commit-Position: refs/heads/master@{#37715}
TBR=mstarzinger@chromium.org,rmcilroy@chromium.org,oth@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4280
Review-Url: https://codereview.chromium.org/2151693003
Cr-Commit-Position: refs/heads/master@{#37743}
This CL reduces the number of dependencies bytecodes.{h,cc} to facilitate
generating the bytecode peephole optimizer table during build. Specifically,
it avoids depending on v8_base.
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/2135273002
Cr-Commit-Position: refs/heads/master@{#37715}
Original commit message:
Also, CodeGenerator::MakeCodeEpilogue now accepts an optional pointer
to a EhFrameWriter and will attach unwinding information to the code
object when passed one.
Reason for reverting:
The STATIC_CONST_MEMBER_DEFINITION in eh-frame-writer-unittest.cc
causes a compiler error on V8 Win64 - clang buildbot.
Removing that bit.
BUG=v8:4899
LOG=N
Review-Url: https://codereview.chromium.org/2023503002
Cr-Commit-Position: refs/heads/master@{#37707}
If operands are loaded as unsigned 32-bit integer, they need to be sign extended to 64 bits.
TEST=cctest/test-run-machops/RunWord32AndAndWord32ShrP, cctest/test-run-machops/RunWord32OrP,
cctest/test-run-machops/RunWord32ShrP, cctest/test-run-machops/RunWord32XorP
BUG=
Review-Url: https://codereview.chromium.org/2147883002
Cr-Commit-Position: refs/heads/master@{#37705}
Previously, the following schedule fragment:
1: Parameter[0](0)
2: Parameter[1](0)
7: Int32Constant[1]
8: Int32Sub(2, 7)
9: Load[kRepTagged|kTypeAny](1, 8)
would generate the following code (on ia32):
mov eax,[ebp+0x8]
mov ecx,[ebp+0xc]
sub eax,0x1
mov eax,[eax+ecx*1]
Now it generates:
mov eax,[ebp+0x8]
mov ecx,[ebp+0xc]
mov eax,[eax+ecx*1-1]
Similar pattern matching also now works on x64.
BUG=v8:5192
LOG=N
Review-Url: https://codereview.chromium.org/2137323003
Cr-Commit-Position: refs/heads/master@{#37701}
Collect type feedback in the call bytecode handler. The current
implementation only collects feedback for JS function objects. The other
objects and Array functions do not collect any feedback. They will be
marked Megamorphic.
BUG=v8:4280, v8:4780
LOG=N
Review-Url: https://codereview.chromium.org/2122183002
Cr-Commit-Position: refs/heads/master@{#37700}
For JSToBoolean with Number inputs we still called out to the
ToBooleanStub, even though we easily handle them inline nowadays.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2145923002
Cr-Commit-Position: refs/heads/master@{#37699}
Reason for revert:
The STATIC_CONST_MEMBER_DEFINITION in eh-frame-writer-unittest.cc causes a compiler error on V8 Win64 - clang buildbot. Removing that bit should be sufficient.
Original issue's description:
> Implement .eh_frame writer and disassembler.
>
> Also, CodeGenerator::MakeCodeEpilogue now accepts an optional pointer
> to a EhFrameWriter and will attach unwinding information to the code
> object when passed one.
>
> BUG=v8:4899
> LOG=N
>
> Committed: https://crrev.com/27d810e63b744b5b3d9aa28ff21413247773e6c2
> Cr-Commit-Position: refs/heads/master@{#37683}
TBR=rmcilroy@chromium.org,jarin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4899
Review-Url: https://codereview.chromium.org/2143033002
Cr-Commit-Position: refs/heads/master@{#37688}
When trying to clone a branch, the ControlFlowOptimizer gave up as soon as it found a Phi/EffectPhi node that could not be placed directly below the IfTrue or IfFalse control paths.
Moving the step in the EffectControlLinearizer phase, after the first schedule, works around the problem by looking at the successor blocks.
BUG=
Review-Url: https://codereview.chromium.org/2139593002
Cr-Commit-Position: refs/heads/master@{#37687}
Also, CodeGenerator::MakeCodeEpilogue now accepts an optional pointer
to a EhFrameWriter and will attach unwinding information to the code
object when passed one.
BUG=v8:4899
LOG=N
Review-Url: https://codereview.chromium.org/2023503002
Cr-Commit-Position: refs/heads/master@{#37683}
This removes the checking for use-def and def-use chain links from the
graph verification. Presence of such links can only be violated by a bug
in the actual {Node} implementation itself. That container class is also
covered by unit tests.
The verification in question was useful in the early days when the graph
implementation itself was prone to bugs. By now it has stabilized and
spending O(n^2) time during graph verification is too wasteful to still
be considered a reasonable trade-off.
R=jarin@chromium.org
TEST=unittests/NodeTest.*
Review-Url: https://codereview.chromium.org/2140973003
Cr-Commit-Position: refs/heads/master@{#37670}
The PlainPrimitiveToNumber operator performs a superset of the operations
previously performed by the BooleanToNumber and StringToNumber operators,
so we can just use the special lowering rules for PlainPrimitiveToNumber
based on the input type and get rid of the specialized operators.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2139183002
Cr-Commit-Position: refs/heads/master@{#37669}
This CL separates the check whether something is tail-callable from
the computation of the size of the stack parameters that a function
takes.
In order to track this precisely, the stack parameter size calculation
uses the recently landed MachineType information that's embedded
in return and parameter value LinkageLocations.
Review-Url: https://codereview.chromium.org/2121753002
Cr-Commit-Position: refs/heads/master@{#37668}
By adding MachineType to LinkageLocation, it is possible not only to reason
about the location of a LinkageLocation on the stack, but also about it's
size. This will be useful in follow-on CLs that attempt to merge some of the
parameter passing logic of tail calls and normal (non-tail) calls.
As a nice side-effect, it is no longer necessary to separately keep a
MachineSignature in a CallDescriptor, because the MachineTypes contianed in
LinkageLocation for all of the Descriptor's parameters and return types are
sufficient. This CL therefore removes the MachineSignature from the
CallDescriptor and adjusts all the calling code accordingly, simplifying and
de-duplicating code in a bunch of places.
R=titzer@chromium.org, bmeurer@chromium.org
LOG=N
Review-Url: https://codereview.chromium.org/2124023003
Cr-Commit-Position: refs/heads/master@{#37633}
Introduces fused bytecodes for fusing LdaSmi followed by a binary op bytecode.
The chosen bytecodes are used frequently in Octane: AddSmi, SubSmi,
BitwiseOrSmi, BitwiseAndSmi, ShiftLeftSmi, ShiftRightSmi.
There are additional code stubs for these operations that are biased towards
both the left hand and right hand operands being Smis.
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/2111923002
Cr-Commit-Position: refs/heads/master@{#37531}
This adds a new optimization phase to the TurboFan pipeline, which walks
over the effect chain and tries to eliminate redundant loads (and even
some stores) of object fields. We currently ignore element access, but
that will probably need to be handled as well at some point. We also
don't have any special treatment to properly track object maps, which is
also on the list of things that will happen afterwards.
The implementation is pretty simple currently, and probably way to
inefficient. It's meant to be a proof-of-concept to iterate on.
R=jarin@chromium.org
BUG=v8:4930,v8:5141
Review-Url: https://codereview.chromium.org/2120253002
Cr-Commit-Position: refs/heads/master@{#37528}
This just removes some left-overs from when the {JSTypedLoweringTest}
covered strong mode and an iteration over all language modes was used
for testing all binary operations. The language mode in question has
been removed since then.
R=bmeurer@chromium.org
Review-Url: https://codereview.chromium.org/2121113002
Cr-Commit-Position: refs/heads/master@{#37526}
This removes the frame state input representing the before-state from
nodes having the {JSAdd} or the {JSSubtract} 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=jarin@chromium.org
BUG=v8:5021
Review-Url: https://codereview.chromium.org/2125593002
Cr-Commit-Position: refs/heads/master@{#37522}
This drops the %_ValueOf intrinsic, but keeps the runtime entry
%ValueOf for now, by either migrating the functionality (mostly
Debug mirror or toString/valueOf methods) to C++ or TurboFan
builtins, or switching to the %ValueOf runtime call when it's
not performance critical anyways.
The %_ValueOf intrinsic was one of the last blockers for fixing
the unsound machine operator typing in TurboFan.
R=yangguo@chromium.org
BUG=v8:5049
Committed: https://crrev.com/293bd7882987f00e465710ce468bfb1eaa7d3fa2
Review-Url: https://codereview.chromium.org/2126453002
Cr-Original-Commit-Position: refs/heads/master@{#37512}
Cr-Commit-Position: refs/heads/master@{#37519}
The Number.parseInt (and therefore the parseInt function on the global
object) are often used instead of Math.floor or just plain int32
truncation, and we can easily recognize those cases and provide a fast
path in TurboFan.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2125583002
Cr-Commit-Position: refs/heads/master@{#37518}
The reason:
same as the CL #37371 (Issue 2111493002: X87: disable some sin/cos/expm1/tan test cases for x87.), please
refer https://codereview.chromium.org/2111493002 for more details.
For Acosh/ASinh test cases, the expected values are pre-defined double precision values, the results
generated by C++ function are extended double precision as the extended double precision is default for x87
Gcc compiler and std lib on linux platform. The comparison of different precisons caused some of those test
cases failed.
This CL disables Acosh/ASinh test cases for x87.
BUG=
Review-Url: https://codereview.chromium.org/2122593002
Cr-Commit-Position: refs/heads/master@{#37516}
Reason for revert:
[Sheriff] Breaks without i18n:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20noi18n%20-%20debug/builds/8466
Original issue's description:
> [intrinsic] Drop the %_ValueOf intrinsic.
>
> This drops the %_ValueOf intrinsic, but keeps the runtime entry
> %ValueOf for now, by either migrating the functionality (mostly
> Debug mirror or toString/valueOf methods) to C++ or TurboFan
> builtins, or switching to the %ValueOf runtime call when it's
> not performance critical anyways.
>
> The %_ValueOf intrinsic was one of the last blockers for fixing
> the unsound machine operator typing in TurboFan.
>
> R=yangguo@chromium.org
> BUG=v8:5049
>
> Committed: https://crrev.com/293bd7882987f00e465710ce468bfb1eaa7d3fa2
> Cr-Commit-Position: refs/heads/master@{#37512}
TBR=yangguo@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5049
Review-Url: https://codereview.chromium.org/2117273002
Cr-Commit-Position: refs/heads/master@{#37514}
This drops the %_ValueOf intrinsic, but keeps the runtime entry
%ValueOf for now, by either migrating the functionality (mostly
Debug mirror or toString/valueOf methods) to C++ or TurboFan
builtins, or switching to the %ValueOf runtime call when it's
not performance critical anyways.
The %_ValueOf intrinsic was one of the last blockers for fixing
the unsound machine operator typing in TurboFan.
R=yangguo@chromium.org
BUG=v8:5049
Review-Url: https://codereview.chromium.org/2126453002
Cr-Commit-Position: refs/heads/master@{#37512}
This optimizes the passing of stack parameters in function calls.
For some architectures (ia32/x64), using pushes when possible instead
of bumping the stack and then storing parameters generates much
smaller code, and in some cases is faster (e.g. when a push of a memory
location can implement a memory-to-memory copy and thus elide an
intermediate load. On others (e.g. ARM), the benefit is smaller, where
it's only possible to elide direct stack pointer adjustment in certain cases
or combine multiple register stores into a single instruction in other limited
situations. On yet other platforms (ARM64, MIPS), there are no push instructions,
and this optimization isn't used at all.
Ideally, this mechanism would be used for both tail calls and normal calls,
but "normal" calls are currently pretty efficient, and tail calls are very
inefficient, so this CL sets the bar low for building a new mechanism to
handle parameter pushing that only needs to raise the bar on tail calls for now.
The key aspect of this change is that adjustment to the stack pointer
for tail calls (and perhaps later real calls) is an explicit step separate from
instruction selection and gap resolution, but aware of both, making it possible
to safely recognize gap moves that are actually pushes.
Review-Url: https://codereview.chromium.org/2082263002
Cr-Commit-Position: refs/heads/master@{#37477}
Import fdlibm versions of acos, acosh, asin and asinh, which are more
precise and produce the same result across platforms (we were using
libm versions for asin and acos so far, where both speed and precision
depended on the operating system so far). Introduce appropriate TurboFan
operators for these functions and use them both for inlining and for the
generic builtin.
Also migrate the Math.imul and Math.fround builtins to TurboFan builtins
to ensure that their behavior is always exactly the same as the inlined
TurboFan version (i.e. C++ truncation semantics for double to float
don't necessarily meet the JavaScript semantics).
For completeness, also migrate Math.sign, which can even get some nice
love in TurboFan.
Drive-by-fix: Some alpha-sorting on the Math related functions, and
cleanup the list of Math intrinsics that we have to export via the
native context currently.
BUG=v8:3266,v8:3496,v8:3509,v8:3952,v8:5169,v8:5170,v8:5171,v8:5172
TBR=rossberg@chromium.orgR=franzih@chromium.org
Review-Url: https://codereview.chromium.org/2116753002
Cr-Commit-Position: refs/heads/master@{#37476}
-Defines SIMD128_REGISTERS for all platforms.
-Adds Simd128 register information to RegisterConfiguration, and implements
aliasing calculations.
LOG=N
BUG=v8:4124
Review-Url: https://codereview.chromium.org/2092103004
Cr-Commit-Position: refs/heads/master@{#37437}
Perform the following transformation:
| Before | After |
|------------------+---------------------|
| add w2, w0, w1 | adds w2, w0, w1 |
| cmp w2, #0x0 | b.<cond'> <addr> |
| b.<cond> <addr> | |
|------------------+---------------------|
| add w2, w0, w1 | adds w2, w0, w1 |
| cmp #0x0, w2 | b.<cond'> <addr> |
| b.<cond> <addr> | |
and the same for and instructions instead of add. When the result of the
add/and is not used, generate cmn/tst instead. We need to take care with which
conditions we can handle and what new condition we map them to.
BUG=
Review-Url: https://codereview.chromium.org/2065243005
Cr-Commit-Position: refs/heads/master@{#37400}
There are no useful typing rules for Change and Checked operators, so we
better make sure we don't run them through the Typer at all.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2107783004
Cr-Commit-Position: refs/heads/master@{#37382}
The reason:
All RunFloat64Sin/RunFloat64Cos/RunFloat64Expm1/RunFloat64Tan/Ieee754.Expm1/Ieee754.Cos/Ieee754.Tan test cases
use the C++ function to generate the expected value or result. So for x87, all those expected value or result are
extended double precision as the extended double precision is default for x87 Gcc compiler and std lib on linux platform.
The issue is:
For RunFloat64Sin/RunFloat64Cos/RunFloat64Expm1/RunFloat64Tan test cases, the expected values generated by C++ function
are extended double precision, the results generated by X87 jitted code are double precision according to the ECMA standard.
The comparison of different precisons caused some of those test cases failed.
For Ieee754.Expm1/Ieee754.Cos/Ieee754.Tan test cases, the expected values are pre-defined double precision values, the results
generated by C++ function are extended double precision. The comparison of different precisons caused some of those test cases
failed too.
This CL disables RunFloat64Sin/RunFloat64Cos/RunFloat64Expm1/RunFloat64Tan/Ieee754.Expm1/Ieee754.Cos/Ieee754.Tan test cases for x87.
BUG=
Review-Url: https://codereview.chromium.org/2111493002
Cr-Commit-Position: refs/heads/master@{#37371}
The only real use case left for TypeGuard was the renaming inside the
LoadElimination, but this case only occurs in dead code (guarded by a
previous Check), so it's not relevant, and we can drop the TypeGuard
operator completely.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2108793003
Cr-Commit-Position: refs/heads/master@{#37361}
This avoids forgetting to add files for either gyp or gn.
While for most executables, this is detected by compilation
errors, for test executables, it can lead to tests silently
not running.
BUG=chromium:474921
Review-Url: https://codereview.chromium.org/2098313002
Cr-Commit-Position: refs/heads/master@{#37331}
Introduce a new machine operator Float64Pow that for now is backed by
the existing MathPowStub to start the unification of Math.pow, and at
the same time address the main performance issue that TurboFan still has
with the imaging-darkroom benchmark in Kraken.
Also migrate the Math.pow builtin itself to a TurboFan builtin and
remove a few hundred lines of hand-written platform code for special
handling of the fullcodegen Math.pow version.
BUG=v8:3599,v8:5086,v8:5157
Review-Url: https://codereview.chromium.org/2103733003
Cr-Commit-Position: refs/heads/master@{#37323}
Add NumberAbs operator to implement an inline version of Math.abs, that
can be optimized and eliminated. We don't use any speculation here, but
for now stick to the information we can infer (this way we avoid the
inherent deopt loops that Crankshaft has around Math.abs).
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
R=jarin@chromium.org
BUG=v8:5086
Review-Url: https://codereview.chromium.org/2096403002
Cr-Commit-Position: refs/heads/master@{#37306}
When reading malformed input, the length of variable-length types can be very large. Computing operand length with this and adding it to PC will overflow and screw up decode.
This patch switches to unsigned int for arity and lengths, terminates loop analysis on error, adds overflow checking to BranchTableOperand, and adds a unit test.
Review-Url: https://codereview.chromium.org/2052623003
Cr-Commit-Position: refs/heads/master@{#37301}
- Add a const bool kSimpleFPAliasing variable for each platform so it's
easier for the compiler to eliminate dead code.
- Modify RegisterAllocator to use it.
LOG=N
BUG=v8:4124
Review-Url: https://codereview.chromium.org/2101473002
Cr-Commit-Position: refs/heads/master@{#37288}
The global object can be loaded from the native context and the name can be loaded in the type feedback metadata.
BUG=chromium:576312
Review-Url: https://codereview.chromium.org/2096653003
Cr-Commit-Position: refs/heads/master@{#37278}
- Adds the concept of FP register aliasing to RegisterConfiguration.
- Changes RegisterAllocator to distinguish between FP representations
when allocating.
- Changes LinearScanAllocator to detect interference when FP register
aliasing is combining, as on ARM.
- Changes ARM code generation to allow all registers s0 - s31 to be
accessed.
- Adds unit tests for RegisterConfiguration, mostly to test aliasing
calculations.
LOG=N
BUG=v8:4124
Review-Url: https://codereview.chromium.org/2086653003
Cr-Commit-Position: refs/heads/master@{#37251}
Lowering of Int64Load, Int64Store, BitcastInt64ToFloat64 and
BitcastFloat64ToInt64 was using LE word ordering in memory,
causing failures on some tests.
BUG=mjsunit/regress/regress-599719,mjsunit/regress/regress-599717
Review-Url: https://codereview.chromium.org/2080213004
Cr-Commit-Position: refs/heads/master@{#37213}
CMN is a flag-setting add operation, and therefore is commutative.
{Add,Sub}WithOverflow generate ADD/SUB instructions that cannot
support a ROR shift.
BUG=
Review-Url: https://codereview.chromium.org/2087233005
Cr-Commit-Position: refs/heads/master@{#37212}
Let the SimplifiedOperatorReducer perform some strength reduction for
certain CheckTaggedSigned and CheckTaggedPointer inputs (reusing the
existing logic for ObjectIsSmi).
R=jarin@chromium.org
BUG=v8:5141
Review-Url: https://codereview.chromium.org/2080703006
Cr-Commit-Position: refs/heads/master@{#37167}
Add control dependencies to Projection and Int32Add/SubWithOverflow
operators, to prevent the scheduler from moving the Projection nodes
into the wrong place. This way the instruction selection can combine
the Int32Add/SubWithOverflow operations with the DeoptimizeIf and/or
DeoptimizeUnless nodes. This needs new operators CheckedInt32Add and
CheckedInt32Sub so that we can delay the actual lowering until the
effect/control linearizer.
This also makes CheckIf operator obsolete, so we can drop it.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2082993002
Cr-Commit-Position: refs/heads/master@{#37148}
Adds back simple dead code elimination to the bytecode pipeline.
BUG=v8:4280,chromium:616064
Review-Url: https://codereview.chromium.org/2038083002
Cr-Commit-Position: refs/heads/master@{#37147}
Implements:
- WebAssembly object,
- WebAssembly.Module constructor,
- WebAssembly.Instance constructor,
- WebAssembly.compile async method,
- and Module and Instance instance objects.
Also, changes ErrorThrower to support capturing errors in a promise reject.
Since we cannot yet compile without fixing the Wasm memory, and cannot validate a module without compiling, the Module constructor and compile method don't do anything yet but checking that their argument is a suitable BufferSource. Instead of a compiled module, the hidden state of a Module object currently is just that buffer.
BUG=
Review-Url: https://codereview.chromium.org/2084573002
Cr-Commit-Position: refs/heads/master@{#37143}
Add explicit state in BytecodeSourceInfo to simplify checks for
validity and whether a statement or expression position.
Remove BytecodeSourceInfo::Update which inherited rules for updating
source position information during bytecode building.
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/2048203002
Cr-Commit-Position: refs/heads/master@{#37136}
Make intrinsic ids a contiguous set of ids so that the switch statement can build
a table switch rather than doing a large if/else tree.
BUG=v8:4822
LOG=N
Review-Url: https://codereview.chromium.org/2084623002
Cr-Commit-Position: refs/heads/master@{#37135}
While the EcmaScript specification doesn't define precise values for the
Math constants or the Math functions, we should at least ensure that the
values of the constants and the functions agree, i.e. Math.E should be
exactly the same value as Math.exp(1).
Also make sure that Math.exp(1) returns the expected value; we should
revisit the fdlibm algorithm and figure out why it's wrong in the last
bit.
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
BUG=chromium:626111,v8:3266,v8:3468,v8:3493,v8:5086,v8:5108
R=yangguo@chromium.org
Review-Url: https://codereview.chromium.org/2079233005
Cr-Commit-Position: refs/heads/master@{#37128}
These are used to check for Smi or HeapObject, and we use them
appropriately in JSNativeContextSpecialization, so we don't need
to introduce dependencies on concrete control flow and/or concrete
frame states.
They will be optimized by a proper check elimination reducer,
which will be added in a separate CL.
R=jarin@chromium.org
BUG=v8:4470
Review-Url: https://codereview.chromium.org/2082523002
Cr-Commit-Position: refs/heads/master@{#37096}
Import base::ieee754::tan() from fdlibm and introduce Float64Tan TurboFan
operator based on that, similar to what we do for Float64Cos and Float64Sin.
Rewrite Math.tan() as TurboFan builtin and use those operators to also
inline Math.tan() into optimized TurboFan functions.
Drive-by-fix: Kill the %_ConstructDouble intrinsics, and provide only
the %ConstructDouble runtime entry for writing tests.
BUG=v8:5086,v8:5126
R=yangguo@chromium.org
Review-Url: https://codereview.chromium.org/2083453002
Cr-Commit-Position: refs/heads/master@{#37087}
Compilation of wasm functions happens before instantiation. Imports are linked afterwards, at instantiation time. Globals and memory are also
allocated and then tied in via relocation at instantiation time.
This paves the way for implementing Wasm.compile, a prerequisite to
offering the compiled code serialization feature.
Currently, the WasmModule::Compile method just returns a fixed array
containing the code objects. More appropriate modeling of the compiled module to come.
Opportunistically centralized the logic on how to update memory
references, size, and globals, since that logic is the exact same on each
architecture, except for the actual storing of values back in the
instruction stream.
BUG=v8:5072
Review-Url: https://codereview.chromium.org/2056633002
Cr-Commit-Position: refs/heads/master@{#37086}
Import base::ieee754::cos() and base::ieee754::sin() from fdlibm and
introduce Float64Cos and Float64Sin TurboFan operator based on that,
similar to what we do for Float64Log. Rewrite Math.cos() and Math.sin()
as TurboFan builtins and use those operators to also inline Math.cos()
and Math.sin() into optimized TurboFan functions.
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
R=mvstanton@chromium.org
BUG=v8:5086,v8:5118
Review-Url: https://codereview.chromium.org/2073123002
Cr-Commit-Position: refs/heads/master@{#37072}
Import base::ieee754::exp() from FreeBSD msun and introduce a Float64Exp
TurboFan operator based on that, similar to what we do for Float64Log.
Rewrite Math.exp() as TurboFan builtin and use that operator to also
inline Math.exp() into optimized TurboFan functions.
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
BUG=v8:3266,v8:3468,v8:3493,v8:5086,v8:5108,chromium:620786
R=mvstanton@chromium.org
Committed: https://crrev.com/93e26314afc9da9b5b8bd998688262444ed73260
Review-Url: https://codereview.chromium.org/2077533002
Cr-Original-Commit-Position: refs/heads/master@{#37037}
Cr-Commit-Position: refs/heads/master@{#37047}
If (mask >>> s) == 0, ((x & mask) >> s) == 0, so replace the node with zero in
MachineOperatorReducer.
BUG=
Review-Url: https://codereview.chromium.org/2069973002
Cr-Commit-Position: refs/heads/master@{#37046}
Reason for revert:
[Sheriff] Leads to some different rounding as it seems in some audio layout tests. Please rebase upstream first if intended:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/7508
Original issue's description:
> [builtins] Introduce proper Float64Exp operator.
>
> Import base::ieee754::exp() from FreeBSD msun and introduce a Float64Exp
> TurboFan operator based on that, similar to what we do for Float64Log.
> Rewrite Math.exp() as TurboFan builtin and use that operator to also
> inline Math.exp() into optimized TurboFan functions.
>
> BUG=v8:3266,v8:3468,v8:3493,v8:5086,v8:5108
> R=mvstanton@chromium.org
>
> Committed: https://crrev.com/93e26314afc9da9b5b8bd998688262444ed73260
> Cr-Commit-Position: refs/heads/master@{#37037}
TBR=mvstanton@chromium.org,ahaas@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3266,v8:3468,v8:3493,v8:5086,v8:5108
Review-Url: https://codereview.chromium.org/2070813002
Cr-Commit-Position: refs/heads/master@{#37039}
Import base::ieee754::exp() from FreeBSD msun and introduce a Float64Exp
TurboFan operator based on that, similar to what we do for Float64Log.
Rewrite Math.exp() as TurboFan builtin and use that operator to also
inline Math.exp() into optimized TurboFan functions.
BUG=v8:3266,v8:3468,v8:3493,v8:5086,v8:5108
R=mvstanton@chromium.org
Review-Url: https://codereview.chromium.org/2077533002
Cr-Commit-Position: refs/heads/master@{#37037}
Those were wrongly translated from gyp with ia32. This should
land before renaming v8_target_arch to v8_target_cpu.
BUG=chromium:620527
NOTRY=true
TBR=vogelheim@chromium.org
Review-Url: https://codereview.chromium.org/2065323004
Cr-Commit-Position: refs/heads/master@{#37027}
Now that we have the PlainPrimitiveToNumber operator(s), we can unify
all the places where we expect a number, but can also safely handle any
plain-primitive (via ToNumber truncation).
Drive-by-fix: Also handle Math.min consistently with Math.max.
R=jarin@chromium.org
Review-Url: https://codereview.chromium.org/2064953004
Cr-Commit-Position: refs/heads/master@{#36984}
The modifications were necessary to properly represent asm types:
1) fround is no longer an overloaded function.
2) the constructor for MinMaxTypes now takes a return type.
3) Adds pseudo-types for representing the Load/Store types for fp heap views.
BUG=
Review-Url: https://codereview.chromium.org/2069443002
Cr-Commit-Position: refs/heads/master@{#36980}
Reason for revert:
Cannot reproduce gc-stress failures locally.
Original issue's description:
> Revert of Replace all remaining Oddball checks with new function (patchset #10 id:180001 of https://codereview.chromium.org/2043183003/ )
>
> 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=
>
> Committed: https://crrev.com/33b8bc24a12fb062100c0be84456faeb0b9fa5d1
> Cr-Commit-Position: refs/heads/master@{#36923}
TBR=mstarzinger@chromium.org,verwaest@chromium.org,yangguo@chromium.org,ahaas@chromium.org
BUG=
Review-Url: https://codereview.chromium.org/2059173002
Cr-Commit-Position: refs/heads/master@{#36957}
This moves common configs used by all v8 targets into
common templates.
This also fixes using v8_optimized_debug correctly in
executables and components.
BUG=chromium:474921
NOTRY=true
Review-Url: https://codereview.chromium.org/2054803003
Cr-Commit-Position: refs/heads/master@{#36956}
This CL introduces the new type system for the ASM
type-checker/validator.
BUG=
Review-Url: https://codereview.chromium.org/2045703007
Cr-Commit-Position: refs/heads/master@{#36942}
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}
