diff options
Diffstat (limited to 'llvm/lib/Support')
| -rw-r--r-- | llvm/lib/Support/raw_ostream.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Support/raw_ostream.cpp b/llvm/lib/Support/raw_ostream.cpp index 7b9b8b2f53fb..fae4a4308fd7 100644 --- a/llvm/lib/Support/raw_ostream.cpp +++ b/llvm/lib/Support/raw_ostream.cpp @@ -84,8 +84,15 @@ raw_ostream::~raw_ostream() { } size_t raw_ostream::preferred_buffer_size() const { +#ifdef _WIN32 + // On Windows BUFSIZ is only 512 which results in more calls to write. This + // overhead can cause significant performance degradation. Therefore use a + // better default. + return (16 * 1024); +#else // BUFSIZ is intended to be a reasonable default. return BUFSIZ; +#endif } void raw_ostream::SetBuffered() { |