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Vector Downward GetSize optimization (#6925)

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* Added Google benchmarks (and gtests)

* Separate benchmark CMakeLists.txt to its own file

* Move output directory to target just flatbenchmark

* Reduced from encoding 210ns -> 188ns

* store size_ as uoffset_t

* fixed windows c4267 warning
This commit is contained in:
Derek Bailey
2021-11-22 19:50:42 -08:00
committed by GitHub
parent a2b99084b4
commit 9e4ca857b6
4 changed files with 26 additions and 14 deletions
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22
include/flatbuffers/vector_downward.h
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@@ -38,6 +38,7 @@ class vector_downward {
initial_size_(initial_size),
buffer_minalign_(buffer_minalign),
reserved_(0),
size_(0),
buf_(nullptr),
cur_(nullptr),
scratch_(nullptr) {}
@@ -49,6 +50,7 @@ class vector_downward {
initial_size_(other.initial_size_),
buffer_minalign_(other.buffer_minalign_),
reserved_(other.reserved_),
size_(other.size_),
buf_(other.buf_),
cur_(other.cur_),
scratch_(other.scratch_) {
@@ -86,6 +88,7 @@ class vector_downward {
reserved_ = 0;
cur_ = nullptr;
}
size_ = 0;
clear_scratch();
}
@@ -139,17 +142,18 @@ class vector_downward {
}
inline uint8_t *make_space(size_t len) {
size_t space = ensure_space(len);
cur_ -= space;
if (len) {
ensure_space(len);
cur_ -= len;
size_ += static_cast<uoffset_t>(len);
}
return cur_;
}
// Returns nullptr if using the DefaultAllocator.
Allocator *get_custom_allocator() { return allocator_; }
uoffset_t size() const {
return static_cast<uoffset_t>(reserved_ - static_cast<size_t>(cur_ - buf_));
}
inline uoffset_t size() const { return size_; }
uoffset_t scratch_size() const {
return static_cast<uoffset_t>(scratch_ - buf_);
@@ -203,7 +207,11 @@ class vector_downward {
memset(make_space(zero_pad_bytes), 0, zero_pad_bytes);
}
void pop(size_t bytes_to_remove) { cur_ += bytes_to_remove; }
void pop(size_t bytes_to_remove) {
cur_ += bytes_to_remove;
size_ -= static_cast<uoffset_t>(bytes_to_remove);
}
void scratch_pop(size_t bytes_to_remove) { scratch_ -= bytes_to_remove; }
void swap(vector_downward &other) {
@@ -213,6 +221,7 @@ class vector_downward {
swap(initial_size_, other.initial_size_);
swap(buffer_minalign_, other.buffer_minalign_);
swap(reserved_, other.reserved_);
swap(size_, other.size_);
swap(buf_, other.buf_);
swap(cur_, other.cur_);
swap(scratch_, other.scratch_);
@@ -234,6 +243,7 @@ class vector_downward {
size_t initial_size_;
size_t buffer_minalign_;
size_t reserved_;
uoffset_t size_;
uint8_t *buf_;
uint8_t *cur_; // Points at location between empty (below) and used (above).
uint8_t *scratch_; // Points to the end of the scratchpad in use.