- Use for exceptional buffer conditions in raw_ostream:write to shave
off a cycle or two.
- Please rename if you have a better one.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67103
91177308-0d34-0410-b5e6-
96231b3b80d8
#define ATTRIBUTE_USED
#endif
+#if (__GNUC__ >= 4)
+#define BUILTIN_EXPECT(EXPR, VALUE) __builtin_expect((EXPR), (VALUE))
+#else
+#define BUILTIN_EXPECT(EXPR, VALUE) (EXPR)
+#endif
+
// C++ doesn't support 'extern template' of template specializations. GCC does,
// but requires __extension__ before it. In the header, use this:
// EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>);
#include "llvm/System/Program.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Config/config.h"
+#include "llvm/Support/Compiler.h"
#include <ostream>
#if defined(HAVE_UNISTD_H)
raw_ostream &raw_ostream::write(const char *Ptr, unsigned Size) {
// Group exceptional cases into a single branch.
- if (OutBufCur+Size > OutBufEnd) {
+ if (BUILTIN_EXPECT(OutBufCur+Size > OutBufEnd, false)) {
if (Unbuffered) {
write_impl(Ptr, Size);
return *this;