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-rw-r--r--src/pugixml.cpp28
1 files changed, 19 insertions, 9 deletions
diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index 026921f..ad2262f 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -84,6 +84,13 @@
# define PUGI__NO_INLINE
#endif
+// Branch weight controls
+#if defined(__GNUC__)
+# define PUGI__UNLIKELY(cond) __builtin_expect(cond, 0)
+#else
+# define PUGI__UNLIKELY(cond) (cond)
+#endif
+
// Simple static assertion
#define PUGI__STATIC_ASSERT(cond) { static const char condition_failed[(cond) ? 1 : -1] = {0}; (void)condition_failed[0]; }
@@ -1896,6 +1903,7 @@ PUGI__NS_BEGIN
#define PUGI__POPNODE() { cursor = cursor->parent; }
#define PUGI__SCANFOR(X) { while (*s != 0 && !(X)) ++s; }
#define PUGI__SCANWHILE(X) { while (X) ++s; }
+ #define PUGI__SCANWHILE_UNROLL(X) { while (X) { ++s; if (PUGI__UNLIKELY(!(X))) break; ++s; if (PUGI__UNLIKELY(!(X))) break; ++s; if (PUGI__UNLIKELY(!(X))) break; ++s; } }
#define PUGI__ENDSEG() { ch = *s; *s = 0; ++s; }
#define PUGI__THROW_ERROR(err, m) return error_offset = m, error_status = err, static_cast<char_t*>(0)
#define PUGI__CHECK_ERROR(err, m) { if (*s == 0) PUGI__THROW_ERROR(err, m); }
@@ -1906,7 +1914,7 @@ PUGI__NS_BEGIN
while (true)
{
- PUGI__SCANWHILE(!PUGI__IS_CHARTYPE(*s, ct_parse_comment));
+ PUGI__SCANWHILE_UNROLL(!PUGI__IS_CHARTYPE(*s, ct_parse_comment));
if (*s == '\r') // Either a single 0x0d or 0x0d 0x0a pair
{
@@ -1934,7 +1942,7 @@ PUGI__NS_BEGIN
while (true)
{
- PUGI__SCANWHILE(!PUGI__IS_CHARTYPE(*s, ct_parse_cdata));
+ PUGI__SCANWHILE_UNROLL(!PUGI__IS_CHARTYPE(*s, ct_parse_cdata));
if (*s == '\r') // Either a single 0x0d or 0x0d 0x0a pair
{
@@ -1968,7 +1976,7 @@ PUGI__NS_BEGIN
while (true)
{
- PUGI__SCANWHILE(!PUGI__IS_CHARTYPE(*s, ct_parse_pcdata));
+ PUGI__SCANWHILE_UNROLL(!PUGI__IS_CHARTYPE(*s, ct_parse_pcdata));
if (*s == '<') // PCDATA ends here
{
@@ -2048,7 +2056,7 @@ PUGI__NS_BEGIN
while (true)
{
- PUGI__SCANWHILE(!PUGI__IS_CHARTYPE(*s, ct_parse_attr_ws | ct_space));
+ PUGI__SCANWHILE_UNROLL(!PUGI__IS_CHARTYPE(*s, ct_parse_attr_ws | ct_space));
if (*s == end_quote)
{
@@ -2089,7 +2097,7 @@ PUGI__NS_BEGIN
while (true)
{
- PUGI__SCANWHILE(!PUGI__IS_CHARTYPE(*s, ct_parse_attr_ws));
+ PUGI__SCANWHILE_UNROLL(!PUGI__IS_CHARTYPE(*s, ct_parse_attr_ws));
if (*s == end_quote)
{
@@ -2125,7 +2133,7 @@ PUGI__NS_BEGIN
while (true)
{
- PUGI__SCANWHILE(!PUGI__IS_CHARTYPE(*s, ct_parse_attr));
+ PUGI__SCANWHILE_UNROLL(!PUGI__IS_CHARTYPE(*s, ct_parse_attr));
if (*s == end_quote)
{
@@ -2157,7 +2165,7 @@ PUGI__NS_BEGIN
while (true)
{
- PUGI__SCANWHILE(!PUGI__IS_CHARTYPE(*s, ct_parse_attr));
+ PUGI__SCANWHILE_UNROLL(!PUGI__IS_CHARTYPE(*s, ct_parse_attr));
if (*s == end_quote)
{
@@ -2559,7 +2567,7 @@ PUGI__NS_BEGIN
cursor->name = s;
- PUGI__SCANWHILE(PUGI__IS_CHARTYPE(*s, ct_symbol)); // Scan for a terminator.
+ PUGI__SCANWHILE_UNROLL(PUGI__IS_CHARTYPE(*s, ct_symbol)); // Scan for a terminator.
PUGI__ENDSEG(); // Save char in 'ch', terminate & step over.
if (ch == '>')
@@ -2580,7 +2588,7 @@ PUGI__NS_BEGIN
a->name = s; // Save the offset.
- PUGI__SCANWHILE(PUGI__IS_CHARTYPE(*s, ct_symbol)); // Scan for a terminator.
+ PUGI__SCANWHILE_UNROLL(PUGI__IS_CHARTYPE(*s, ct_symbol)); // Scan for a terminator.
PUGI__CHECK_ERROR(status_bad_attribute, s); //$ redundant, left for performance
PUGI__ENDSEG(); // Save char in 'ch', terminate & step over.
@@ -10706,6 +10714,7 @@ namespace pugi
// Undefine all local macros (makes sure we're not leaking macros in header-only mode)
#undef PUGI__NO_INLINE
+#undef PUGI__UNLIKELY
#undef PUGI__STATIC_ASSERT
#undef PUGI__DMC_VOLATILE
#undef PUGI__MSVC_CRT_VERSION
@@ -10723,6 +10732,7 @@ namespace pugi
#undef PUGI__POPNODE
#undef PUGI__SCANFOR
#undef PUGI__SCANWHILE
+#undef PUGI__SCANWHILE_UNROLL
#undef PUGI__ENDSEG
#undef PUGI__THROW_ERROR
#undef PUGI__CHECK_ERROR