u99127 commented on a change in pull request #5516:
URL: https://github.com/apache/incubator-tvm/pull/5516#discussion_r420387251
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File path: src/support/ring_buffer.h
##########
@@ -63,17 +67,28 @@ class RingBuffer {
size_t ncopy = head_ptr_ + bytes_available_ - old_size;
memcpy(&ring_[0] + old_size, &ring_[0], ncopy);
}
- } else if (ring_.size() > n * 8 && ring_.size() > kInitCapacity &&
bytes_available_ > 0) {
- // shrink too large temporary buffer to avoid out of memory on some
embedded devices
+ } else if (ring_.size() > n * 8 &&
+ ring_.size() > kInitCapacity) {
+ // shrink too large temporary buffer to
+ // avoid out of memory on some embedded devices
size_t old_bytes = bytes_available_;
-
std::vector<char> tmp(old_bytes);
- Read(&tmp[0], old_bytes);
- ring_.resize(kInitCapacity);
+ if (old_bytes != 0) {
+ Read(&tmp[0], old_bytes);
+ }
+
+ size_t new_size = kInitCapacity;
+ new_size = std::max(new_size, bytes_available_);
+ new_size = std::max(new_size, n);
+
+ ring_.resize(new_size);
ring_.shrink_to_fit();
- memcpy(&ring_[0], &tmp[0], old_bytes);
+ if (old_bytes != 0) {
+ memcpy(&ring_[0], &tmp[0], old_bytes);
+ }
+
Review comment:
Not performance critical but I think it could be better recast as below.
if (bytes_available != 0)
{
... existing code
}
else
{
ring_.resize(kInitCapacity);
ring_.shrink_to_fit();
}
Avoids unnecessary runtime calls to std::max with 0 and additional checks
that can go. And for bonus points, encapsulate ring_.resize(new_size) and
ring_.shrink_to_fit into a small helper function if you so choose.
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