Add BUILTIN_EXPECT Support/Compiler macro.
- 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
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 639d6fa..f62a31d 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -16,6 +16,7 @@
#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)
@@ -142,7 +143,7 @@
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;