Skip to content

buffer: make compare/equals faster #52993

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
May 16, 2024
Merged

buffer: make compare/equals faster #52993

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 21 additions & 1 deletion src/node_buffer.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ using v8::ArrayBufferView;
using v8::BackingStore;
using v8::Context;
using v8::EscapableHandleScope;
using v8::FastApiTypedArray;
using v8::FunctionCallbackInfo;
using v8::Global;
using v8::HandleScope;
Expand Down Expand Up @@ -843,6 +844,23 @@ void Compare(const FunctionCallbackInfo<Value> &args) {
args.GetReturnValue().Set(val);
}

int32_t FastCompare(v8::Local<v8::Value>,
const FastApiTypedArray<uint8_t>& a,
const FastApiTypedArray<uint8_t>& b) {
uint8_t* data_a;
uint8_t* data_b;
CHECK(a.getStorageIfAligned(&data_a));
CHECK(b.getStorageIfAligned(&data_b));

size_t cmp_length = std::min(a.length(), b.length());

return normalizeCompareVal(
cmp_length > 0 ? memcmp(data_a, data_b, cmp_length) : 0,
a.length(),
b.length());
}

static v8::CFunction fast_compare(v8::CFunction::Make(FastCompare));

// Computes the offset for starting an indexOf or lastIndexOf search.
// Returns either a valid offset in [0...<length - 1>], ie inside the Buffer,
Expand Down Expand Up @@ -1409,7 +1427,7 @@ void Initialize(Local<Object> target,
SlowByteLengthUtf8,
&fast_byte_length_utf8);
SetMethod(context, target, "copy", Copy);
SetMethodNoSideEffect(context, target, "compare", Compare);
SetFastMethodNoSideEffect(context, target, "compare", Compare, &fast_compare);
SetMethodNoSideEffect(context, target, "compareOffset", CompareOffset);
SetMethod(context, target, "fill", Fill);
SetMethodNoSideEffect(context, target, "indexOfBuffer", IndexOfBuffer);
Expand Down Expand Up @@ -1469,6 +1487,8 @@ void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
registry->Register(FastByteLengthUtf8);
registry->Register(Copy);
registry->Register(Compare);
registry->Register(FastCompare);
registry->Register(fast_compare.GetTypeInfo());
registry->Register(CompareOffset);
registry->Register(Fill);
registry->Register(IndexOfBuffer);
Expand Down
5 changes: 5 additions & 0 deletions src/node_external_reference.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,10 @@ using CFunctionCallbackWithStrings =
bool (*)(v8::Local<v8::Value>,
const v8::FastOneByteString& input,
const v8::FastOneByteString& base);
using CFunctionCallbackWithTwoUint8Arrays =
int32_t (*)(v8::Local<v8::Value>,
const v8::FastApiTypedArray<uint8_t>&,
const v8::FastApiTypedArray<uint8_t>&);
using CFunctionCallbackWithTwoUint8ArraysFallback =
bool (*)(v8::Local<v8::Value>,
const v8::FastApiTypedArray<uint8_t>&,
Expand Down Expand Up @@ -56,6 +60,7 @@ class ExternalReferenceRegistry {
V(CFunctionCallbackWithBool) \
V(CFunctionCallbackWithString) \
V(CFunctionCallbackWithStrings) \
V(CFunctionCallbackWithTwoUint8Arrays) \
V(CFunctionCallbackWithTwoUint8ArraysFallback) \
V(CFunctionWithUint32) \
V(CFunctionWithDoubleReturnDouble) \
Expand Down