From f30af12bea0d55971dac37d8891bd9717158d73e Mon Sep 17 00:00:00 2001
From: frmdstryr <frmdstryr@protonmail.com>
Date: Tue, 10 Dec 2019 13:44:59 -0500
Subject: [PATCH] Add hotpath for BufferedOutStream (#3858)

* Add hotpath for BufferedOutStream
---
 lib/std/io.zig | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/std/io.zig b/lib/std/io.zig
index c8635b8551daaec0a114512c6cb88e6e5cae3cfd..312e954a7d242daef5d85ae8aa615dd1dd7d7f0c 100644
--- a/lib/std/io.zig
+++ b/lib/std/io.zig
@@ -592,7 +592,16 @@ pub fn BufferedOutStreamCustom(comptime buffer_size: usize, comptime OutStreamEr
         fn writeFn(out_stream: *Stream, bytes: []const u8) Error!void {
             const self = @fieldParentPtr(Self, "stream", out_stream);
 
-            if (bytes.len >= self.buffer.len) {
+            if (bytes.len == 1) {
+                // This is not required logic but a shorter path
+                // for single byte writes
+                self.buffer[self.index] = bytes[0];
+                self.index += 1;
+                if (self.index == buffer_size) {
+                    try self.flush();
+                }
+                return;
+            } else if (bytes.len >= self.buffer.len) {
                 try self.flush();
                 return self.unbuffered_out_stream.write(bytes);
             }
-- 
2.54.0