Write space padding as one string to speed up comment printing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76910 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/FormattedStream.cpp b/lib/Support/FormattedStream.cpp
index 3523e2d..1796f9f 100644
--- a/lib/Support/FormattedStream.cpp
+++ b/lib/Support/FormattedStream.cpp
@@ -12,6 +12,8 @@
//===----------------------------------------------------------------------===//
#include "llvm/Support/FormattedStream.h"
+#include <algorithm>
+
using namespace llvm;
/// ComputeColumn - Examine the current output and figure out which
@@ -44,9 +46,17 @@
if (NewCol < Column || num < MinPad)
num = MinPad;
- // TODO: Write a whole string at a time.
- while (num-- > 0)
- write(' ');
+ // Keep a buffer of spaces handy to speed up processing.
+ static char Spaces[MAX_COLUMN_PAD];
+ static bool Initialized = false;
+ if (!Initialized) {
+ std::fill_n(Spaces, MAX_COLUMN_PAD, ' '),
+ Initialized = true;
+ }
+
+ assert(num < MAX_COLUMN_PAD && "Unexpectedly large column padding");
+
+ write(Spaces, num);
}
/// fouts() - This returns a reference to a formatted_raw_ostream for