Improve performance of Symbol concatenation (#41992)

JuliaLang · Aug 26, 2021 · f1b5abc · f1b5abc
1 parent 2445000
commit f1b5abc
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/base/strings/substring.jl b/base/strings/substring.jl
@@ -205,7 +205,13 @@ end
     return n
 end
 
-function string(a::Union{Char, String, SubString{String}}...)
+@inline function __unsafe_string!(out, s::Symbol, offs::Integer)
+    n = sizeof(s)
+    GC.@preserve s out unsafe_copyto!(pointer(out, offs), unsafe_convert(Ptr{UInt8},s), n)
+    return n
+end
+
+function string(a::Union{Char, String, SubString{String}, Symbol}...)
     n = 0
     for v in a
         if v isa Char