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Simplify the raw_svector_ostream tweak from r212816

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The memcpy() and overlap helps didn't help much with timings, so clean up the change.

The difference at this point is that we now leave growth of the storage buffer
up to SmallVector's implementation:

 -   OS.reserve(OS.capacity() * 2);
 +   OS.reserve(OS.size() + 64);

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212837 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alp Toker 2014-07-11 18:23:08 +00:00
parent c345ba880d
commit 1736df6ae0
1 changed files with 4 additions and 13 deletions
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17
lib/Support/raw_ostream.cpp
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@ -729,26 +729,17 @@ void raw_svector_ostream::resync() {
}
void raw_svector_ostream::write_impl(const char *Ptr, size_t Size) {
size_t NewSize = OS.size() + Size;
size_t NewReservation = NewSize + 64;
bool NoOverlap = Ptr + Size < OS.begin() || Ptr > OS.begin() + OS.capacity();
if (NoOverlap) {
assert(!GetNumBytesInBuffer());
OS.reserve(NewReservation);
memcpy(OS.end(), Ptr, Size);
OS.set_size(NewSize);
} else if (Ptr == OS.end()) {
if (Ptr == OS.end()) {
// Grow the buffer to include the scratch area without copying.
size_t NewSize = OS.size() + Size;
assert(NewSize <= OS.capacity() && "Invalid write_impl() call!");
OS.set_size(NewSize);
OS.reserve(NewReservation);
} else {
assert(!GetNumBytesInBuffer());
OS.append(Ptr, Ptr + Size);
OS.reserve(NewReservation);
}
OS.reserve(OS.size() + 64);
SetBuffer(OS.end(), OS.capacity() - OS.size());
}