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v8/test/unittests/compiler
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Benedikt Meurer 500d7b9315 [turbofan] Introduce a dedicated StringLength operator. 
Strings are immutable in JavaScript land (contrast with the runtime,
where we can truncate strings that haven't escaped to JavaScript yet),
so the length of a String is immutable. Thus loading the length of a
String is a pure operation and should be expressed as such (i.e. doesn't
depend on control or effect). The StringLength operator does exactly
this and is hooked up to the effect chain in the EffectControlLinearizer.

This will eventually allow us to simplify the optimization of string
concatention and other operations that are a bit cumbersome in TurboFan
currently, and it will also allow us to optimize string operations
across effectful operations, for example combining multiple invocations
to String#slice with the same inputs.

Bug: v8:5269, v8:6936, v8:7109, v8:7137
Change-Id: Iffcccbb0c7fc4cfe1281c10e7af24b40eba4c987
Reviewed-on: https://chromium-review.googlesource.com/799690
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49731}
2017-11-30 06:55:06 +00:00
..
arm [turbofan] Fix arm backend matching of (x >>> 24) & 0xffff. 2017-08-31 13:50:07 +00:00
arm64 [base] Generalize bits::CountPopulation 2017-10-18 16:16:15 +00:00
ia32 [iwyu] Remove illegal inline include from "macro-assembler.h" 2017-09-13 11:44:07 +00:00
mips MIPS: Update OWNERS 2017-11-10 14:33:48 +00:00
mips64 MIPS: Update OWNERS 2017-11-10 14:33:48 +00:00
ppc PPC/s390: [iwyu] Remove illegal inline include from "macro-assembler.h" 2017-09-14 12:23:51 +00:00
regalloc [cleanup] [compiler] Fix (D)CHECK macros 2017-09-25 10:21:34 +00:00
s390 PPC/s390: [iwyu] Remove illegal inline include from "macro-assembler.h" 2017-09-14 12:23:51 +00:00
x64 [turbofan] Enable complex memory operands for binops on ia32/x64 2017-03-13 08:50:54 +00:00
branch-elimination-unittest.cc Revert "[TurboFan] Diagnostic code to track down bug in representation selection" 2017-11-14 09:26:51 +00:00
bytecode-analysis-unittest.cc [Compiler] Remove isolate from CompilationInfo. 2017-11-15 15:40:55 +00:00
checkpoint-elimination-unittest.cc [turbofan] Rename {CheckPoint} to {Checkpoint} everywhere. 2016-06-01 09:07:19 +00:00
code-assembler-unittest.cc [csa] Transform multiplications into left shifts 2017-11-10 18:29:11 +00:00
code-assembler-unittest.h [csa] Add constant folding more universally to CodeAssembler operators 2017-09-12 10:03:10 +00:00
common-operator-reducer-unittest.cc [jumbo] add unittests jumbo support 2017-09-28 22:19:40 +00:00
common-operator-unittest.cc [jumbo] add unittests jumbo support 2017-09-28 22:19:40 +00:00
compiler-test-utils.h [turbofan] Drop V8_TURBOFAN_BACKEND and V8_TURBOFAN_TARGET defines. 2015-08-10 07:17:34 +00:00
control-equivalence-unittest.cc This CL enables precise source positions for all V8 compilers. It merges compiler::SourcePosition and internal::SourcePosition to a single class used throughout the codebase. The new internal::SourcePosition instances store an id identifying an inlined function in addition to a script offset. 2016-11-14 17:22:32 +00:00
control-flow-optimizer-unittest.cc [turbofan] Move TryCloneBranch in the EffectControlLinearizer pass. 2016-07-12 15:23:36 +00:00
dead-code-elimination-unittest.cc Reland^6 "[turbofan] eagerly prune None types and deadness from the graph" 2017-11-16 20:01:22 +00:00
diamond-unittest.cc [cleanup] [compiler] Fix (D)CHECK macros 2017-09-25 10:21:34 +00:00
effect-control-linearizer-unittest.cc [turbofan] Elide redundant {IfSuccess} control projections. 2017-03-15 09:26:18 +00:00
graph-reducer-unittest.cc [jumbo] add unittests jumbo support 2017-09-28 22:19:40 +00:00
graph-reducer-unittest.h [turbofan] Add AdvancedReducer::ReplaceWithValue() method and convert JSInlining to an AdvancedReducer. 2015-05-12 12:41:36 +00:00
graph-trimmer-unittest.cc [turbofan] Proper dead code elimination as regular reducer. 2015-06-19 12:07:26 +00:00
graph-unittest.cc [jumbo] fix android/windows kDummyOperator collision 2017-10-20 12:43:57 +00:00
graph-unittest.h [turbofan] Improve typed lowering rules for JSToBoolean. 2016-11-24 06:37:14 +00:00
instruction-selector-unittest.cc Remove compiler distinction from RegisterConfiguration. 2017-08-03 07:47:36 +00:00
instruction-selector-unittest.h [turbofan] Remove ToFloat64AsInt and make ToFloat64 return a Double 2017-07-14 15:01:02 +00:00
instruction-sequence-unittest.cc [cleanup] [compiler] Fix (D)CHECK macros 2017-09-25 10:21:34 +00:00
instruction-sequence-unittest.h MIPS: Reland of Fix bad RegisterConfiguration usage in InstructionSequence unit tests 2016-12-23 10:51:08 +00:00
instruction-unittest.cc [jumbo] add unittests jumbo support 2017-09-28 22:19:40 +00:00
int64-lowering-unittest.cc [wasm] Introduce the WasmContext 2017-09-28 16:14:03 +00:00
js-builtin-reducer-unittest.cc [TurboFan] Delete AstGraphBuilder. 2017-08-10 15:56:21 +00:00
js-create-lowering-unittest.cc [turbofan] Properly optimize literals in inlined functions. 2017-09-25 13:05:16 +00:00
js-intrinsic-lowering-unittest.cc [TurboFan] Broken effect chain in IsInstanceType reduction 2017-10-18 13:50:41 +00:00
js-operator-unittest.cc [TurboFan] Model TypeOf as a simplified operator 2017-10-16 19:15:00 +00:00
js-typed-lowering-unittest.cc [turbofan] Introduce a dedicated StringLength operator. 2017-11-30 06:55:06 +00:00
linkage-tail-call-unittest.cc Fix compilation failure when v8 compiled with GCC 5.x due to -Werror=unused-variable 2016-08-05 12:56:40 +00:00
live-range-builder.h [turbofan] Make MachineType a pair of enums. 2015-12-10 09:03:53 +00:00
load-elimination-unittest.cc [turbofan] Fix introduction of contradicting {TypeGuard}. 2017-08-08 11:54:51 +00:00
loop-peeling-unittest.cc [turbofan] Support variable size argument removal in TF-generated functions 2016-11-02 13:15:57 +00:00
machine-operator-reducer-unittest.cc [base] Consolidate IsPowerOfTwo{32,64} and IS_POWER_OF_TWO 2017-07-13 10:49:09 +00:00
machine-operator-unittest.cc [jumbo] fix another set of unittest compilation errors 2017-10-19 09:15:44 +00:00
node-cache-unittest.cc [jumbo] add unittests jumbo support 2017-09-28 22:19:40 +00:00
node-matchers-unittest.cc [turbofan] Relax limitation for using BaseWithIndexAndDisplacement for load/stores 2017-02-24 06:38:14 +00:00
node-properties-unittest.cc [jumbo] add unittests jumbo support 2017-09-28 22:19:40 +00:00
node-test-utils.cc [turbofan] Introduce a dedicated StringLength operator. 2017-11-30 06:55:06 +00:00
node-test-utils.h [turbofan] Introduce a dedicated StringLength operator. 2017-11-30 06:55:06 +00:00
node-unittest.cc [jumbo] fix another set of unittest compilation errors 2017-10-19 09:15:44 +00:00
opcodes-unittest.cc [unittests] Reduce compilation overhead of opcodes-unittest.cc. 2016-09-13 05:16:18 +00:00
persistent-unittest.cc Reland2: [turbofan] staging new implementation of escape analysis 2017-07-31 10:01:07 +00:00
schedule-unittest.cc [jumbo] fix android/windows kDummyOperator collision 2017-10-20 12:43:57 +00:00
scheduler-rpo-unittest.cc Replace SmartPointer<T> with unique_ptr<T> 2016-07-25 11:14:34 +00:00
scheduler-unittest.cc This CL enables precise source positions for all V8 compilers. It merges compiler::SourcePosition and internal::SourcePosition to a single class used throughout the codebase. The new internal::SourcePosition instances store an id identifying an inlined function in addition to a script offset. 2016-11-14 17:22:32 +00:00
simplified-operator-reducer-unittest.cc [jumbo] add unittests jumbo support 2017-09-28 22:19:40 +00:00
simplified-operator-unittest.cc [jumbo] fix another set of unittest compilation errors 2017-10-19 09:15:44 +00:00
state-values-utils-unittest.cc [turbofan] Sparse representation for state values 2017-01-05 10:44:44 +00:00
typed-optimization-unittest.cc [turbofan] Remove the unused ToBooleanHints. 2017-11-20 09:42:38 +00:00
typer-unittest.cc [turbofan] Remove the unused ToBooleanHints. 2017-11-20 09:42:38 +00:00
value-numbering-reducer-unittest.cc [jumbo] fix another set of unittest compilation errors 2017-10-19 09:15:44 +00:00
zone-stats-unittest.cc Named all zones in the project 2016-10-17 12:12:42 +00:00