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Optimize CreateVector for types > 1 byte on little endian (#4355)

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This gives a 10x speed up in my test, when creating a Vector of floats
This commit is contained in:
Christopher Berner
2017-06-16 15:29:47 -07:00
committed by Wouter van Oortmerssen
parent f52f848b95
commit 57f3752d5e
1 changed files with 18 additions and 6 deletions
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24
include/flatbuffers/flatbuffers.h
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@@ -1120,16 +1120,28 @@ class FlatBufferBuilder
/// where the vector is stored.
template<typename T> Offset<Vector<T>> CreateVector(const T *v, size_t len) {
StartVector(len, sizeof(T));
if (sizeof(T) == 1) {
PushBytes(reinterpret_cast<const uint8_t *>(v), len);
} else {
for (auto i = len; i > 0; ) {
PushElement(v[--i]);
#if FLATBUFFERS_LITTLEENDIAN
PushBytes(reinterpret_cast<const uint8_t *>(v), len * sizeof(T));
#else
if (sizeof(T) == 1) {
PushBytes(reinterpret_cast<const uint8_t *>(v), len);
} else {
for (auto i = len; i > 0; ) {
PushElement(v[--i]);
}
}
}
#endif
return Offset<Vector<T>>(EndVector(len));
}
template<typename T> Offset<Vector<Offset<T>>> CreateVector(const Offset<T> *v, size_t len) {
StartVector(len, sizeof(Offset<T>));
for (auto i = len; i > 0; ) {
PushElement(v[--i]);
}
return Offset<Vector<Offset<T>>>(EndVector(len));
}
/// @brief Serialize a `std::vector` into a FlatBuffer `vector`.
/// @tparam T The data type of the `std::vector` elements.
/// @param v A const reference to the `std::vector` to serialize into the