* [PATCH] stream_input: avoid allocation for common #read case
@ 2016-12-29 7:08 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2016-12-29 7:08 UTC (permalink / raw)
To: yahns-public
When entering StreamInput#read, it is common for @rbuf to
be drained and empty, meaning a simple String#clear can
be used in place of a more complex String#slice! String#replace
combo on an empty @rbuf.
While we're at it, we'll avoid an extra instructions for calling
`@rbuf.size` by storing the size in a local.
---
Of course, for TeeInput, there's bigger fish to fry with
IO#write: https://bugs.ruby-lang.org/issues/13085
Ugh, kicking myself so hard for not noticing that commit
3 years ago :<
lib/yahns/stream_input.rb | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/yahns/stream_input.rb b/lib/yahns/stream_input.rb
index 496faa2..a6190fc 100644
--- a/lib/yahns/stream_input.rb
+++ b/lib/yahns/stream_input.rb
@@ -43,8 +43,9 @@ def read(length = nil, rv = ''.dup)
length < 0 and raise ArgumentError, "negative length #{length} given"
rv.replace(@rbuf.slice!(0, length))
else
- to_read = length - @rbuf.size
- rv.replace(@rbuf.slice!(0, @rbuf.size))
+ cur = @rbuf.size
+ to_read = length - cur
+ cur == 0 ? rv.clear : rv.replace(@rbuf.slice!(0, cur))
until to_read == 0 || eof? || (rv.size > 0 && @chunked)
@client.yahns_read(to_read, @buf) or eof!
filter_body(@rbuf, @buf)
--
EW
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