organicmaps/pugixml
13
Fork 0
Code Issues 1 Pull requests Projects Releases Wiki Activity Actions

Optimize xml_buffered_writer::write(char_t...)

Browse source 
Make it easier for the compiler to generate good code by loading bufsize
into a local once and returning new offset from flush(). This results in
7% performance gain.

git-svn-id: https://pugixml.googlecode.com/svn/trunk@1024 99668b35-9821-0410-8761-19e4c4f06640
This commit is contained in:
Arseny Kapoulkine 2014-09-25 05:19:41 +00:00
parent ec050e08a4
commit c1829ad29d
1 changed files with 46 additions and 37 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

83
src/pugixml.cpp
View file

@ -3035,10 +3035,11 @@ PUGI__NS_BEGIN
flush();
}
void flush()
size_t flush()
{
flush(buffer, bufsize);
bufsize = 0;
return 0;
}
void flush(const char_t* data, size_t size)
@ -3100,10 +3101,12 @@ PUGI__NS_BEGIN
void write(const char_t* data, size_t length)
{
if (bufsize + length <= bufcapacity)
size_t offset = bufsize;
if (offset + length <= bufcapacity)
{
memcpy(buffer + bufsize, data, length * sizeof(char_t));
bufsize += length;
memcpy(buffer + offset, data, length * sizeof(char_t));
bufsize = offset + length;
}
else
{
@ -3138,65 +3141,71 @@ PUGI__NS_BEGIN
void write(char_t d0)
{
if (bufsize + 1 > bufcapacity) flush();
size_t offset = bufsize;
if (offset > bufcapacity - 1) offset = flush();
buffer[bufsize + 0] = d0;
bufsize += 1;
buffer[offset + 0] = d0;
bufsize = offset + 1;
}
void write(char_t d0, char_t d1)
{
if (bufsize + 2 > bufcapacity) flush();
size_t offset = bufsize;
if (offset > bufcapacity - 2) offset = flush();
buffer[bufsize + 0] = d0;
buffer[bufsize + 1] = d1;
bufsize += 2;
buffer[offset + 0] = d0;
buffer[offset + 1] = d1;
bufsize = offset + 2;
}
void write(char_t d0, char_t d1, char_t d2)
{
if (bufsize + 3 > bufcapacity) flush();
size_t offset = bufsize;
if (offset > bufcapacity - 3) offset = flush();
buffer[bufsize + 0] = d0;
buffer[bufsize + 1] = d1;
buffer[bufsize + 2] = d2;
bufsize += 3;
buffer[offset + 0] = d0;
buffer[offset + 1] = d1;
buffer[offset + 2] = d2;
bufsize = offset + 3;
}
void write(char_t d0, char_t d1, char_t d2, char_t d3)
{
if (bufsize + 4 > bufcapacity) flush();
size_t offset = bufsize;
if (offset > bufcapacity - 4) offset = flush();
buffer[bufsize + 0] = d0;
buffer[bufsize + 1] = d1;
buffer[bufsize + 2] = d2;
buffer[bufsize + 3] = d3;
bufsize += 4;
buffer[offset + 0] = d0;
buffer[offset + 1] = d1;
buffer[offset + 2] = d2;
buffer[offset + 3] = d3;
bufsize = offset + 4;
}
void write(char_t d0, char_t d1, char_t d2, char_t d3, char_t d4)
{
if (bufsize + 5 > bufcapacity) flush();
size_t offset = bufsize;
if (offset > bufcapacity - 5) offset = flush();
buffer[bufsize + 0] = d0;
buffer[bufsize + 1] = d1;
buffer[bufsize + 2] = d2;
buffer[bufsize + 3] = d3;
buffer[bufsize + 4] = d4;
bufsize += 5;
buffer[offset + 0] = d0;
buffer[offset + 1] = d1;
buffer[offset + 2] = d2;
buffer[offset + 3] = d3;
buffer[offset + 4] = d4;
bufsize = offset + 5;
}
void write(char_t d0, char_t d1, char_t d2, char_t d3, char_t d4, char_t d5)
{
if (bufsize + 6 > bufcapacity) flush();
size_t offset = bufsize;
if (offset > bufcapacity - 6) offset = flush();
buffer[bufsize + 0] = d0;
buffer[bufsize + 1] = d1;
buffer[bufsize + 2] = d2;
buffer[bufsize + 3] = d3;
buffer[bufsize + 4] = d4;
buffer[bufsize + 5] = d5;
bufsize += 6;
buffer[offset + 0] = d0;
buffer[offset + 1] = d1;
buffer[offset + 2] = d2;
buffer[offset + 3] = d3;
buffer[offset + 4] = d4;
buffer[offset + 5] = d5;
bufsize = offset + 6;
}
// utf8 maximum expansion: x4 (-> utf32)