- 05 Aug, 2016 2 commits
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machenbach authored
Revert of [Interpreter] Collect type feedback for 'new' in the bytecode handler (patchset #6 id:100001 of https://codereview.chromium.org/2190293003/ ) Reason for revert: [Sheriff] Fails on nosnap debug: https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug/builds/8403 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 > earlier cl (https://codereview.chromium.org/2153433002/) was reverted > because that implementation did not collect allocation site feedback. > This regressed delta blue by an order of magnitude. This implementation > includes collection of allocation site feedback. > > BUG=v8:4280, v8:4780 > LOG=N > > Committed: https://crrev.com/9d5e6129c4c7f9cbfe81a5fad2a470f219fe137c > Cr-Commit-Position: refs/heads/master@{#38364} TBR=bmeurer@chromium.org,rmcilroy@chromium.org,balazs.kilvady@imgtec.com,mythria@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/2212343002 Cr-Commit-Position: refs/heads/master@{#38368}
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mythria authored
Collect type feedback in the bytecode handler for 'new' bytecode. The earlier cl (https://codereview.chromium.org/2153433002/) was reverted because that implementation did not collect allocation site feedback. This regressed delta blue by an order of magnitude. This implementation includes collection of allocation site feedback. BUG=v8:4280, v8:4780 LOG=N Review-Url: https://codereview.chromium.org/2190293003 Cr-Commit-Position: refs/heads/master@{#38364}
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- 01 Aug, 2016 1 commit
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klaasb authored
This will enable the interpreter to add a bytecode and use the stub. BUG=v8:4280 LOG=n Review-Url: https://codereview.chromium.org/2177273002 Cr-Commit-Position: refs/heads/master@{#38219}
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- 14 Jul, 2016 1 commit
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ishell authored
All stores require a Slot parameter so VectorStoreICTrampolineDescriptor is a new StoreDescriptor. VectorStoreICDescriptor renamed to StoreWithVectorDescriptor. Review-Url: https://codereview.chromium.org/2147043002 Cr-Commit-Position: refs/heads/master@{#37779}
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- 06 Jul, 2016 1 commit
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danno authored
BUG=608675 Review-Url: https://codereview.chromium.org/2113673002 Cr-Commit-Position: refs/heads/master@{#37550}
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- 15 Jun, 2016 1 commit
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ishell authored
The new approach is that instead of compiling custom handlers for every global object's PropertyCell it uses single dispatcher that caches PropertyCells in respective slot of the feedback vector. Currently the new LoadGlobalIC machinery is disabled. This CL also removes unused LoadGlobalViaContext* stuff. BUG=chromium:576312 LOG=Y Review-Url: https://codereview.chromium.org/2065113002 Cr-Commit-Position: refs/heads/master@{#37002}
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- 10 Jun, 2016 1 commit
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danno authored
Instead, always tail call to the runtime. Also, cleanup the various versions of the runtime call that is used for Array construction fallback. There can be only one. BUG=chromium:608675 LOG=N Review-Url: https://codereview.chromium.org/2024253002 Cr-Commit-Position: refs/heads/master@{#36888}
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- 08 Jun, 2016 1 commit
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verwaest authored
This speeds up .bind by >10x as measured by function f(a,b,c) {} for (var i = 0; i < 10000000; i++) { f.bind(1); // or more arguments. } (Uses hydrogen-stubs rather than TF due to var-args + possible runtime fallback, which is still unsupported in TF.) BUG= Review-Url: https://codereview.chromium.org/2044113002 Cr-Commit-Position: refs/heads/master@{#36817}
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- 02 Jun, 2016 1 commit
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ishell authored
This CL introduces a DECLARE_DEFAULT_DESCRIPTOR macro that helps defining a CallInterfaceDescriptor in a cases where it is not important which registers to use for passing arguments. One can use such descriptors for new TurboFan stubs. HasPropertyDescriptor now uses the new machinery. Review-Url: https://codereview.chromium.org/2002143002 Cr-Commit-Position: refs/heads/master@{#36675}
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- 24 May, 2016 1 commit
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danno authored
BUG=chromium:608675 LOG=n Review-Url: https://codereview.chromium.org/1987183002 Cr-Commit-Position: refs/heads/master@{#36463}
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- 17 May, 2016 1 commit
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bmeurer authored
This adds back the instanceof operator support in the backends and introduces a @@hasInstance protector cell on the isolate that guards the fast path for the InstanceOfStub. This way we recover the ~10% regression on Octane EarleyBoyer in Crankshaft and greatly improve TurboFan and Ignition performance of instanceof. R=ishell@chromium.org TBR=hpayer@chromium.org,rossberg@chromium.org BUG=chromium:597249, v8:4447 LOG=n Review-Url: https://codereview.chromium.org/1980483003 Cr-Commit-Position: refs/heads/master@{#36275}
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- 03 May, 2016 2 commits
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ishell authored
Code common with ObjectHasOwnProperty builtin was moved to CodeStubAssembler. BUG=v8:2743 LOG=Y Review-Url: https://codereview.chromium.org/1894953004 Cr-Commit-Position: refs/heads/master@{#35972}
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danno authored
Review-Url: https://codereview.chromium.org/1903723003 Cr-Commit-Position: refs/heads/master@{#35963}
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- 30 Apr, 2016 1 commit
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bmeurer authored
Further refactor the pipeline to even run the first scheduler (part of the effect control linearization) concurrently. This temporarily disables most of the write barrier elimination, but we will get back to that later. Drive-by-fix: Remove the dead code from ChangeLowering, and stack allocate the Typer in the pipeline. Also migrate the AllocateStub to a native code builtin, so that we have the code object + a handle to it available all the time. CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel R=mstarzinger@chromium.org BUG=v8:4969 LOG=n Review-Url: https://codereview.chromium.org/1926023002 Cr-Commit-Position: refs/heads/master@{#35918}
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- 28 Apr, 2016 2 commits
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machenbach authored
Revert of [turbofan] Run everything after representation selection concurrently. (patchset #2 id:20001 of https://codereview.chromium.org/1926023002/ ) Reason for revert: [Sheriff] Flaky crashed here and there: https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/9867 https://build.chromium.org/p/client.v8/builders/V8%20Linux64/builds/9589 https://build.chromium.org/p/client.v8/builders/V8%20Mac/builds/7679 Original issue's description: > [turbofan] Run everything after representation selection concurrently. > > Further refactor the pipeline to even run the first scheduler (part of > the effect control linearization) concurrently. This temporarily > disables most of the write barrier elimination, but we will get back to > that later. TBR=mstarzinger@chromium.org,bmeurer@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review-Url: https://codereview.chromium.org/1925073002 Cr-Commit-Position: refs/heads/master@{#35863}
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bmeurer authored
Further refactor the pipeline to even run the first scheduler (part of the effect control linearization) concurrently. This temporarily disables most of the write barrier elimination, but we will get back to that later. Review-Url: https://codereview.chromium.org/1926023002 Cr-Commit-Position: refs/heads/master@{#35861}
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- 22 Apr, 2016 1 commit
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rmcilroy authored
Adds IncStub and DecStub TurboFan code stubs and hooks them up to the interpreter's Inc and Dec bytecodes (which are used for count operations, e.g. i++). BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1901083002 Cr-Commit-Position: refs/heads/master@{#35720}
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- 20 Apr, 2016 2 commits
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hablich authored
Reland of Change calling convention of CallApiGetterStub to accept the AccessorInfo (patchset #1 id:1 of https://codereview.chromium.org/1906453002/ ) Reason for revert: Needs other reverts too. Original issue's description: > Revert of Change calling convention of CallApiGetterStub to accept the AccessorInfo (patchset #8 id:140001 of https://codereview.chromium.org/1892533004/ ) > > Reason for revert: > Blocks roll: https://codereview.chromium.org/1896103002/ > > Can also be seen on internal waterfall: https://chromegw.corp.google.com/i/internal.client.v8/builders/v8_cros_perf_1/builds/7558 > > Original issue's description: > > Change calling convention of CallApiGetterStub to accept the AccessorInfo > > > > MIPS port contributed by Balazs Kilvady <balazs.kilvady@imgtec.com> > > > > Committed: https://crrev.com/d2b0a4b727f77f97960c7fa71da3431591dc959f > > Cr-Commit-Position: refs/heads/master@{#35606} > > TBR=rodolph.perfetta@arm.com,jkummerow@chromium.org,jacob.bramley@arm.com,verwaest@chromium.org > # Skipping CQ checks because original CL landed less than 1 days ago. > NOPRESUBMIT=true > NOTREECHECKS=true > NOTRY=true TBR=rodolph.perfetta@arm.com,jkummerow@chromium.org,jacob.bramley@arm.com,verwaest@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review URL: https://codereview.chromium.org/1903093003 Cr-Commit-Position: refs/heads/master@{#35645}
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hablich authored
Revert of Change calling convention of CallApiGetterStub to accept the AccessorInfo (patchset #8 id:140001 of https://codereview.chromium.org/1892533004/ ) Reason for revert: Blocks roll: https://codereview.chromium.org/1896103002/ Can also be seen on internal waterfall: https://chromegw.corp.google.com/i/internal.client.v8/builders/v8_cros_perf_1/builds/7558 Original issue's description: > Change calling convention of CallApiGetterStub to accept the AccessorInfo > > MIPS port contributed by Balazs Kilvady <balazs.kilvady@imgtec.com> > > Committed: https://crrev.com/d2b0a4b727f77f97960c7fa71da3431591dc959f > Cr-Commit-Position: refs/heads/master@{#35606} TBR=rodolph.perfetta@arm.com,jkummerow@chromium.org,jacob.bramley@arm.com,verwaest@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review URL: https://codereview.chromium.org/1906453002 Cr-Commit-Position: refs/heads/master@{#35644}
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- 19 Apr, 2016 2 commits
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rmcilroy authored
Removes the register file machine register from the interpreter and replaces it will loads from the parent frame pointer. As part of this change the raw operand values for register values changes to enable the interpreter to keep using the operand value as the offset from the parent frame pointer. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1894063002 Cr-Commit-Position: refs/heads/master@{#35618}
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verwaest authored
MIPS port contributed by Balazs Kilvady <balazs.kilvady@imgtec.com> Review URL: https://codereview.chromium.org/1892533004 Cr-Commit-Position: refs/heads/master@{#35606}
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- 18 Apr, 2016 1 commit
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binji authored
Reland of (https://codereview.chromium.org/1891033002) This is a much cleaner solution, which won't require nearly as much architecture-specific code. Thanks bmeurer@! BUG=v8:4614 LOG=y TBR=bmeurer@chromium.org Review URL: https://codereview.chromium.org/1902433003 Cr-Commit-Position: refs/heads/master@{#35596}
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- 16 Apr, 2016 2 commits
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machenbach authored
Revert of [Atomics] Remove Atomics code stubs; use TF ops (patchset #6 id:100001 of https://codereview.chromium.org/1891033002/ ) Reason for revert: [Sheriff] Breaks https://build.chromium.org/p/client.v8/builders/V8%20Linux%20ASAN%20mipsel%20-%20debug%20builder/builds/6121 Original issue's description: > [Atomics] Remove Atomics code stubs; use TF ops > > This is a much cleaner solution, which won't require nearly as much > architecture-specific code. Thanks bmeurer@! > > BUG=v8:4614 > LOG=y > R=bmeurer@chromium.org,jarin@chromium.org > > Committed: https://crrev.com/6ff5881b1def45b35384572f61327e42563a89c3 > Cr-Commit-Position: refs/heads/master@{#35547} TBR=bmeurer@chromium.org,jarin@chromium.org,rodolph.perfetta@gmail.com,binji@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4614 Review URL: https://codereview.chromium.org/1895643002 Cr-Commit-Position: refs/heads/master@{#35548}
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binji authored
This is a much cleaner solution, which won't require nearly as much architecture-specific code. Thanks bmeurer@! BUG=v8:4614 LOG=y R=bmeurer@chromium.org,jarin@chromium.org Review URL: https://codereview.chromium.org/1891033002 Cr-Commit-Position: refs/heads/master@{#35547}
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- 13 Apr, 2016 2 commits
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binji authored
Reland of (https://codereview.chromium.org/1617503003) * New atomic code stubs for x64, ia32, arm, arm64 * Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue to macro-assembler-ia32 (API based on x64 macro assembler) * Remove runtime implementation of Atomics.load, the code stub should always be called instead * Add new test to mjsunit atomics test; check that Smi values of different sizes are supported when possible, else fall back to HeapNumbers These changes were needed to add another codestub: * Bump kStubMajorKeyBits from 7 to 8 * Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12 BUG=v8:4614 LOG=y TBR=jarin@chromium.org,bmeurer@chromium.org,rodolph.perfetta@gmail.com,machenbach@chromium.org Review URL: https://codereview.chromium.org/1617503003 Cr-Commit-Position: refs/heads/master@{#35427} Review URL: https://codereview.chromium.org/1881383003 Cr-Commit-Position: refs/heads/master@{#35453}
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machenbach authored
Revert of [Atomics] code stubs for atomic operations (patchset #28 id:530001 of https://codereview.chromium.org/1617503003/ ) Reason for revert: [Sheriff] Roll was reverted. Please fix unused methods, see: https://codereview.chromium.org/1884913002/ https://build.chromium.org/p/tryserver.chromium.win/builders/win_clang/builds/5585/steps/compile%20%28with%20patch%29/logs/stdio Original issue's description: > [Atomics] code stubs for atomic operations > > * New atomic code stubs for x64, ia32, arm, arm64 > * Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue > to macro-assembler-ia32 (API based on x64 macro assembler) > * Remove runtime implementation of Atomics.load, the code stub should always be > called instead > * Add new test to mjsunit atomics test; check that Smi values of different > sizes are supported when possible, else fall back to HeapNumbers > > These changes were needed to add another codestub: > * Bump kStubMajorKeyBits from 7 to 8 > * Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12 > > BUG=v8:4614 > LOG=y > > Committed: https://crrev.com/10b5febe11b318cfef130abae343183ac862e60d > Cr-Commit-Position: refs/heads/master@{#35427} TBR=jarin@chromium.org,bmeurer@chromium.org,rodolph.perfetta@gmail.com,binji@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4614 Review URL: https://codereview.chromium.org/1884883003 Cr-Commit-Position: refs/heads/master@{#35443}
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- 12 Apr, 2016 2 commits
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binji authored
* New atomic code stubs for x64, ia32, arm, arm64 * Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue to macro-assembler-ia32 (API based on x64 macro assembler) * Remove runtime implementation of Atomics.load, the code stub should always be called instead * Add new test to mjsunit atomics test; check that Smi values of different sizes are supported when possible, else fall back to HeapNumbers These changes were needed to add another codestub: * Bump kStubMajorKeyBits from 7 to 8 * Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12 BUG=v8:4614 LOG=y Review URL: https://codereview.chromium.org/1617503003 Cr-Commit-Position: refs/heads/master@{#35427}
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bmeurer authored
Previously TurboFan always went to the runtime to allocate in old space, which is pretty slow compare to a stub call. R=jarin@chromium.org Review URL: https://codereview.chromium.org/1877323002 Cr-Commit-Position: refs/heads/master@{#35418}
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- 06 Apr, 2016 1 commit
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bmeurer authored
Introduce a ResumeGeneratorTrampoline, which does the actual stack state reconstruction (currently always restores a fullcodegen frame), and introduce appropriate TurboFan builtins for %GeneratorPrototype%.next, %GeneratorPrototype%.return and %GeneratorPrototype%.throw based on this native builtin. Also unify the flooding in case of step-in to always work based on JSFunction and remove the special casing for JSGeneratorObject. R=mstarzinger@chromium.org, neis@chromium.org TBR=rossberg@chromium.org BUG=chromium:513471 LOG=n Review URL: https://codereview.chromium.org/1865833002 Cr-Commit-Position: refs/heads/master@{#35283}
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- 22 Mar, 2016 1 commit
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verwaest authored
This roughly doubles performance for generic Array.prototype.push. BUG= Review URL: https://codereview.chromium.org/1816553002 Cr-Commit-Position: refs/heads/master@{#34987}
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- 21 Mar, 2016 2 commits
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bbudge authored
LOG=N BUG=v8:4124 Review URL: https://codereview.chromium.org/1706053002 Cr-Commit-Position: refs/heads/master@{#34951}
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bmeurer authored
Up until now all type conversions (i.e. ToNumber, ToString and friends) had their own specific call interface descriptors, where some of them had to match (i.e. ToString and NumberToString have to use the same argument register). Instead of all the different descriptors, it's sufficient to have a single TypeConversionDescriptor instead. R=jarin@chromium.org Review URL: https://codereview.chromium.org/1823523002 Cr-Commit-Position: refs/heads/master@{#34916}
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- 09 Mar, 2016 3 commits
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vogelheim authored
- Eliminate stubs with a variable number of arguments. (That only worked due to their very limited use. These stubs' interface descriptors were basically lying about their number of args, which will fail when used generically.) - Fix all CallApi*Stubs' interface descriptors to no longer lie about their arguments. - Unify CallApi*Stub, for * in Function, Accessor, FunctionWithFixedArgs. (Since these are now all doing the same thing.) - Rename the unified stub (and interface descriptors) to *ApiCallback*, since that's really what they're doing. - Refuse inlining an API callback if its number of parameters exceeds the supported number of args. BUG= Committed: https://crrev.com/d238b953a474272c0e3ea22ef6a9b63fa9729340 Cr-Commit-Position: refs/heads/master@{#34614} Review URL: https://codereview.chromium.org/1748123003 Cr-Commit-Position: refs/heads/master@{#34627}
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vogelheim authored
Revert of Rework CallApi*Stubs. (patchset #5 id:100001 of https://codereview.chromium.org/1748123003/ ) Reason for revert: Breaks Chromium. Original issue's description: > Rework CallApi*Stubs. > > - Eliminate stubs with a variable number of arguments. > (That only worked due to their very limited use. These > stubs' interface descriptors were basically lying > about their number of args, which will fail when used > generically.) > - Fix all CallApi*Stubs' interface descriptors to no > longer lie about their arguments. > - Unify CallApi*Stub, for * in Function, Accessor, > FunctionWithFixedArgs. > (Since these are now all doing the same thing.) > - Rename the unified stub (and interface descriptors) to > *ApiCallback*, since that's really what they're doing. > - Refuse inlining an API callback if its number of > parameters exceeds the supported number of args. > > BUG= > > Committed: https://crrev.com/d238b953a474272c0e3ea22ef6a9b63fa9729340 > Cr-Commit-Position: refs/heads/master@{#34614} TBR=danno@chromium.org,jkummerow@chromium.org,mstarzinger@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/1775933005 Cr-Commit-Position: refs/heads/master@{#34624}
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vogelheim authored
- Eliminate stubs with a variable number of arguments. (That only worked due to their very limited use. These stubs' interface descriptors were basically lying about their number of args, which will fail when used generically.) - Fix all CallApi*Stubs' interface descriptors to no longer lie about their arguments. - Unify CallApi*Stub, for * in Function, Accessor, FunctionWithFixedArgs. (Since these are now all doing the same thing.) - Rename the unified stub (and interface descriptors) to *ApiCallback*, since that's really what they're doing. - Refuse inlining an API callback if its number of parameters exceeds the supported number of args. BUG= Review URL: https://codereview.chromium.org/1748123003 Cr-Commit-Position: refs/heads/master@{#34614}
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- 27 Feb, 2016 1 commit
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bmeurer authored
Since both null and undefined are also marked as undetectable now, we can just test that bit instead of having the CompareNilIC try to collect feedback to speed up the general case (without the undetectable bit being used). Drive-by-fix: Update the type system to match the new handling of undetectable in the runtime. R=danno@chromium.org Committed: https://crrev.com/666aec0348c8793e61c8633dee7ad29a514239ba Cr-Commit-Position: refs/heads/master@{#34237} Review URL: https://codereview.chromium.org/1722193002 Cr-Commit-Position: refs/heads/master@{#34344}
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- 26 Feb, 2016 1 commit
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adamk authored
Revert of [compiler] Drop the CompareNilIC. (patchset #4 id:60001 of https://codereview.chromium.org/1722193002/ ) Reason for revert: Speculative revert in attempt to fix #2 crasher on canary. Original issue's description: > [compiler] Drop the CompareNilIC. > > Since both null and undefined are also marked as undetectable now, we > can just test that bit instead of having the CompareNilIC try to collect > feedback to speed up the general case (without the undetectable bit > being used). > > Drive-by-fix: Update the type system to match the new handling of > undetectable in the runtime. > > R=danno@chromium.org > > Committed: https://crrev.com/666aec0348c8793e61c8633dee7ad29a514239ba > Cr-Commit-Position: refs/heads/master@{#34237} TBR=danno@chromium.org,verwaest@chromium.org,bmeurer@chromium.org LOG=y BUG=chromium:589897 NOTRY=true Review URL: https://codereview.chromium.org/1743433002 Cr-Commit-Position: refs/heads/master@{#34308}
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- 24 Feb, 2016 3 commits
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mythria authored
Revert of [Interpreter] Implements calls through CallICStub in the interpreter. (patchset #15 id:270001 of https://codereview.chromium.org/1688283003/ ) Reason for revert: It is not a good idea to call CallICStub from the builtin. It might be sensitive to the frame structure. Constructing a internal frame might cause problems. It is much better to inline the code related to the type feedback vector into the builtin. Original issue's description: > [Interpreter] Implements calls through CallICStub in the interpreter. > > Calls are implemented through CallICStub to collect type feedback. Adds > a new builtin called InterpreterPushArgsAndCallIC that pushes the > arguments onto stack and calls CallICStub. > > Also adds two new bytecodes CallIC and CallICWide to indicate calls have to > go through CallICStub. > > MIPS port contributed by balazs.kilvady. > > BUG=v8:4280, v8:4680 > LOG=N > > Committed: https://crrev.com/20362a2214c11a0f2ea5141b6a79e09458939cec > Cr-Commit-Position: refs/heads/master@{#34244} TBR=rmcilroy@chromium.org,mvstanton@chromium.org,mstarzinger@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4280, v8:4680 Review URL: https://codereview.chromium.org/1731253003 Cr-Commit-Position: refs/heads/master@{#34252}
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mythria authored
Calls are implemented through CallICStub to collect type feedback. Adds a new builtin called InterpreterPushArgsAndCallIC that pushes the arguments onto stack and calls CallICStub. Also adds two new bytecodes CallIC and CallICWide to indicate calls have to go through CallICStub. MIPS port contributed by balazs.kilvady. BUG=v8:4280, v8:4680 LOG=N Review URL: https://codereview.chromium.org/1688283003 Cr-Commit-Position: refs/heads/master@{#34244}
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bmeurer authored
Since both null and undefined are also marked as undetectable now, we can just test that bit instead of having the CompareNilIC try to collect feedback to speed up the general case (without the undetectable bit being used). Drive-by-fix: Update the type system to match the new handling of undetectable in the runtime. R=danno@chromium.org Review URL: https://codereview.chromium.org/1722193002 Cr-Commit-Position: refs/heads/master@{#34237}
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