string.c: Optimize String#concat when argc is 1
Optimize performance regression introduced in r56021. * Benchmark (i7-4790K @ 4.00GH, x86_64 GNU/Linux) Benchmark.ips do |x| x.report("String#concat (1)") { "a".concat("b") } if RUBY_VERSION >= "2.4.0" x.report("String#concat (2)") { "a".concat("b", "c") } end end * Ruby 2.3 Calculating ------------------------------------- String#concat (1) 6.003M (± 5.2%) i/s - 30.122M in 5.031646s * Ruby 2.4 (Before this patch) Calculating ------------------------------------- String#concat (1) 4.458M (± 8.9%) i/s - 22.298M in 5.058084s String#concat (2) 3.660M (± 5.6%) i/s - 18.314M in 5.020527s * Ruby 2.4 (After this patch) Calculating ------------------------------------- String#concat (1) 6.448M (± 5.2%) i/s - 32.215M in 5.010833s String#concat (2) 3.633M (± 9.0%) i/s - 18.056M in 5.022603s [fix GH-1631] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58886 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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