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string.c: Improve String#prepend performance if only one argument is …
…given * string.c (rb_str_prepend_multi): Prepend the string without generating temporary String object if only one argument is given. This is very similar with #1634 String#prepend -> 47.5 % up [Fix GH-1670] [ruby-core:82195] [Bug #13773] * Before String#prepend 1.517M (± 1.8%) i/s - 7.614M in 5.019819s * After String#prepend 2.236M (± 3.4%) i/s - 11.234M in 5.029716s * Test code require 'benchmark/ips' Benchmark.ips do |x| x.report "String#prepend" do |loop| loop.times { "!".prepend("hello") } end end git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60480 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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