• Benedikt Meurer's avatar
    [turbofan] Consistently use the StringLength operator. · 60d3f89d
    Benedikt Meurer authored
    Previously all internal accesses to the String::length field in TurboFan
    would use the StringLength operator, whereas explicit `string.length`
    accesses from user JavaScript code would use LoadField operators instead.
    This inconsistency led to redundant loads of the String::length, for
    example in case of code like
    
    ```js
    subject.substring(1, subject.length - 1)
    ```
    
    where the `subject.substring` call introduces a StringLength(subject)
    node, and the `subject.length` introduces a LoadField[length](subject)
    node.
    
    Consistently using StringLength operator everywhere enables
    optimizations in TurboFan that had been blocked before here (besides
    avoiding the redundant load operations).
    
    Bug: v8:8015
    Change-Id: I21c82bc418105b9933a9e60dde11c7b222dfcf4f
    Reviewed-on: https://chromium-review.googlesource.com/1212942
    Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
    Reviewed-by: 's avatarMaya Lekova <mslekova@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#55710}
    60d3f89d
Name
Last commit
Last update
..
arm Loading commit data...
arm64 Loading commit data...
asmjs Loading commit data...
ast Loading commit data...
base Loading commit data...
builtins Loading commit data...
compiler Loading commit data...
compiler-dispatcher Loading commit data...
debug Loading commit data...
extensions Loading commit data...
heap Loading commit data...
ia32 Loading commit data...
ic Loading commit data...
inspector Loading commit data...
interpreter Loading commit data...
js Loading commit data...
libplatform Loading commit data...
libsampler Loading commit data...
mips Loading commit data...
mips64 Loading commit data...
objects Loading commit data...
parsing Loading commit data...
ppc Loading commit data...
profiler Loading commit data...
regexp Loading commit data...
runtime Loading commit data...
s390 Loading commit data...
snapshot Loading commit data...
third_party Loading commit data...
torque Loading commit data...
tracing Loading commit data...
trap-handler Loading commit data...
wasm Loading commit data...
x64 Loading commit data...
zone Loading commit data...
DEPS Loading commit data...
OWNERS Loading commit data...
PRESUBMIT.py Loading commit data...
accessors.cc Loading commit data...
accessors.h Loading commit data...
address-map.cc Loading commit data...
address-map.h Loading commit data...
allocation-site-scopes.h Loading commit data...
allocation.cc Loading commit data...
allocation.h Loading commit data...
api-arguments-inl.h Loading commit data...
api-arguments.cc Loading commit data...
api-arguments.h Loading commit data...
api-inl.h Loading commit data...
api-natives.cc Loading commit data...
api-natives.h Loading commit data...
api.cc Loading commit data...
api.h Loading commit data...
arguments-inl.h Loading commit data...
arguments.cc Loading commit data...
arguments.h Loading commit data...
asan.h Loading commit data...
assembler-arch-inl.h Loading commit data...
assembler-arch.h Loading commit data...
assembler-inl.h Loading commit data...
assembler.cc Loading commit data...
assembler.h Loading commit data...
assert-scope.cc Loading commit data...
assert-scope.h Loading commit data...
async-hooks-wrapper.cc Loading commit data...
async-hooks-wrapper.h Loading commit data...
bailout-reason.cc Loading commit data...
bailout-reason.h Loading commit data...
basic-block-profiler.cc Loading commit data...
basic-block-profiler.h Loading commit data...
bignum-dtoa.cc Loading commit data...
bignum-dtoa.h Loading commit data...
bignum.cc Loading commit data...
bignum.h Loading commit data...
bit-vector.cc Loading commit data...
bit-vector.h Loading commit data...
bootstrapper.cc Loading commit data...
bootstrapper.h Loading commit data...
boxed-float.h Loading commit data...
cached-powers.cc Loading commit data...
cached-powers.h Loading commit data...
callable.h Loading commit data...
cancelable-task.cc Loading commit data...
cancelable-task.h Loading commit data...
char-predicates-inl.h Loading commit data...
char-predicates.cc Loading commit data...
char-predicates.h Loading commit data...
checks.h Loading commit data...
code-events.h Loading commit data...
code-factory.cc Loading commit data...
code-factory.h Loading commit data...
code-reference.cc Loading commit data...
code-reference.h Loading commit data...
code-stub-assembler.cc Loading commit data...
code-stub-assembler.h Loading commit data...
code-stubs-utils.h Loading commit data...
code-stubs.cc Loading commit data...
code-stubs.h Loading commit data...
code-tracer.h Loading commit data...
codegen.cc Loading commit data...
codegen.h Loading commit data...
collector.h Loading commit data...
compilation-cache.cc Loading commit data...
compilation-cache.h Loading commit data...
compilation-statistics.cc Loading commit data...
compilation-statistics.h Loading commit data...
compiler.cc Loading commit data...
compiler.h Loading commit data...
contexts-inl.h Loading commit data...
contexts.cc Loading commit data...
contexts.h Loading commit data...
conversions-inl.h Loading commit data...
conversions.cc Loading commit data...
conversions.h Loading commit data...
counters-inl.h Loading commit data...
counters.cc Loading commit data...
counters.h Loading commit data...
d8-console.cc Loading commit data...
d8-console.h Loading commit data...
d8-posix.cc Loading commit data...
d8-windows.cc Loading commit data...
d8.cc Loading commit data...
d8.h Loading commit data...
d8.js Loading commit data...
date.cc Loading commit data...
date.h Loading commit data...
dateparser-inl.h Loading commit data...
dateparser.cc Loading commit data...
dateparser.h Loading commit data...
deoptimize-reason.cc Loading commit data...
deoptimize-reason.h Loading commit data...
deoptimizer.cc Loading commit data...
deoptimizer.h Loading commit data...
detachable-vector.h Loading commit data...
disasm.h Loading commit data...
disassembler.cc Loading commit data...
disassembler.h Loading commit data...
diy-fp.cc Loading commit data...
diy-fp.h Loading commit data...
double.h Loading commit data...
dtoa.cc Loading commit data...
dtoa.h Loading commit data...
eh-frame.cc Loading commit data...
eh-frame.h Loading commit data...
elements-inl.h Loading commit data...
elements-kind.cc Loading commit data...
elements-kind.h Loading commit data...
elements.cc Loading commit data...
elements.h Loading commit data...
execution.cc Loading commit data...
execution.h Loading commit data...
external-reference-table.cc Loading commit data...
external-reference-table.h Loading commit data...
external-reference.cc Loading commit data...
external-reference.h Loading commit data...
fast-dtoa.cc Loading commit data...
fast-dtoa.h Loading commit data...
feedback-vector-inl.h Loading commit data...
feedback-vector.cc Loading commit data...
feedback-vector.h Loading commit data...
field-index-inl.h Loading commit data...
field-index.h Loading commit data...
field-type.cc Loading commit data...
field-type.h Loading commit data...
fixed-dtoa.cc Loading commit data...
fixed-dtoa.h Loading commit data...
flag-definitions.h Loading commit data...
flags.cc Loading commit data...
flags.h Loading commit data...
frame-constants.h Loading commit data...
frames-inl.h Loading commit data...
frames.cc Loading commit data...
frames.h Loading commit data...
futex-emulation.cc Loading commit data...
futex-emulation.h Loading commit data...
gdb-jit.cc Loading commit data...
gdb-jit.h Loading commit data...
global-handles.cc Loading commit data...
global-handles.h Loading commit data...
globals.h Loading commit data...
handler-table.cc Loading commit data...
handler-table.h Loading commit data...
handles-inl.h Loading commit data...
handles.cc Loading commit data...
handles.h Loading commit data...
heap-symbols.h Loading commit data...
icu_util.cc Loading commit data...
icu_util.h Loading commit data...
identity-map.cc Loading commit data...
identity-map.h Loading commit data...
instruction-stream.cc Loading commit data...
instruction-stream.h Loading commit data...
interface-descriptors.cc Loading commit data...
interface-descriptors.h Loading commit data...
intl.cc Loading commit data...
intl.h Loading commit data...
isolate-inl.h Loading commit data...
isolate.cc Loading commit data...
isolate.h Loading commit data...
json-parser.cc Loading commit data...
json-parser.h Loading commit data...
json-stringifier.cc Loading commit data...
json-stringifier.h Loading commit data...
keys.cc Loading commit data...
keys.h Loading commit data...
label.h Loading commit data...
layout-descriptor-inl.h Loading commit data...
layout-descriptor.cc Loading commit data...
layout-descriptor.h Loading commit data...
locked-queue-inl.h Loading commit data...
locked-queue.h Loading commit data...
log-inl.h Loading commit data...
log-utils.cc Loading commit data...
log-utils.h Loading commit data...
log.cc Loading commit data...
log.h Loading commit data...
lookup-cache-inl.h Loading commit data...
lookup-cache.cc Loading commit data...
lookup-cache.h Loading commit data...
lookup-inl.h Loading commit data...
lookup.cc Loading commit data...
lookup.h Loading commit data...
lsan.h Loading commit data...
machine-type.cc Loading commit data...
machine-type.h Loading commit data...
macro-assembler-inl.h Loading commit data...
macro-assembler.h Loading commit data...
map-updater.cc Loading commit data...
map-updater.h Loading commit data...
maybe-handles-inl.h Loading commit data...
maybe-handles.h Loading commit data...
messages.cc Loading commit data...
messages.h Loading commit data...
msan.h Loading commit data...
objects-body-descriptors-inl.h Loading commit data...
objects-body-descriptors.h Loading commit data...
objects-debug.cc Loading commit data...
objects-definitions.h Loading commit data...
objects-inl.h Loading commit data...
objects-printer.cc Loading commit data...
objects.cc Loading commit data...
objects.h Loading commit data...
optimized-compilation-info.cc Loading commit data...
optimized-compilation-info.h Loading commit data...
ostreams.cc Loading commit data...
ostreams.h Loading commit data...
pending-compilation-error-handler.cc Loading commit data...
pending-compilation-error-handler.h Loading commit data...
perf-jit.cc Loading commit data...
perf-jit.h Loading commit data...
property-descriptor.cc Loading commit data...
property-descriptor.h Loading commit data...
property-details.h Loading commit data...
property.cc Loading commit data...
property.h Loading commit data...
prototype-inl.h Loading commit data...
prototype.h Loading commit data...
register-configuration.cc Loading commit data...
register-configuration.h Loading commit data...
reglist.h Loading commit data...
reloc-info.cc Loading commit data...
reloc-info.h Loading commit data...
roots-inl.h Loading commit data...
roots.h Loading commit data...
runtime-profiler.cc Loading commit data...
runtime-profiler.h Loading commit data...
safepoint-table.cc Loading commit data...
safepoint-table.h Loading commit data...
setup-isolate-deserialize.cc Loading commit data...
setup-isolate-full.cc Loading commit data...
setup-isolate.h Loading commit data...
signature.h Loading commit data...
simulator-base.cc Loading commit data...
simulator-base.h Loading commit data...
simulator.h Loading commit data...
source-position-table.cc Loading commit data...
source-position-table.h Loading commit data...
source-position.cc Loading commit data...
source-position.h Loading commit data...
splay-tree-inl.h Loading commit data...
splay-tree.h Loading commit data...
startup-data-util.cc Loading commit data...
startup-data-util.h Loading commit data...
string-builder-inl.h Loading commit data...
string-builder.cc Loading commit data...
string-case.cc Loading commit data...
string-case.h Loading commit data...
string-hasher-inl.h Loading commit data...
string-hasher.h Loading commit data...
string-search.h Loading commit data...
string-stream.cc Loading commit data...
string-stream.h Loading commit data...
strtod.cc Loading commit data...
strtod.h Loading commit data...
transitions-inl.h Loading commit data...
transitions.cc Loading commit data...
transitions.h Loading commit data...
turbo-assembler.cc Loading commit data...
turbo-assembler.h Loading commit data...
type-hints.cc Loading commit data...
type-hints.h Loading commit data...
unicode-cache-inl.h Loading commit data...
unicode-cache.h Loading commit data...
unicode-decoder.cc Loading commit data...
unicode-decoder.h Loading commit data...
unicode-inl.h Loading commit data...
unicode.cc Loading commit data...
unicode.h Loading commit data...
unoptimized-compilation-info.cc Loading commit data...
unoptimized-compilation-info.h Loading commit data...
uri.cc Loading commit data...
uri.h Loading commit data...
utils-inl.h Loading commit data...
utils.cc Loading commit data...
utils.h Loading commit data...
v8.cc Loading commit data...
v8.h Loading commit data...
v8dll-main.cc Loading commit data...
v8memory.h Loading commit data...
v8threads.cc Loading commit data...
v8threads.h Loading commit data...
value-serializer.cc Loading commit data...
value-serializer.h Loading commit data...
vector-slot-pair.cc Loading commit data...
vector-slot-pair.h Loading commit data...
vector.h Loading commit data...
version.cc Loading commit data...
version.h Loading commit data...
visitors.cc Loading commit data...
visitors.h Loading commit data...
vm-state-inl.h Loading commit data...
vm-state.h Loading commit data...