return immediately from ht_keyindex if dictionary is empty (JuliaLa…

…ng#44341) Avoids hashing the input key for empty dictionaries. Inspired by rust-lang/hashbrown#305.
pcjentsch · Feb 25, 2022 · a2e4226 · a2e4226
1 parent 2e2c16a
commit a2e4226
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/base/dict.jl b/base/dict.jl
@@ -278,6 +278,7 @@ end
 
 # get the index where a key is stored, or -1 if not present
 function ht_keyindex(h::Dict{K,V}, key) where V where K
+ isempty(h) && return -1
  sz = length(h.keys)
  iter = 0
  maxprobe = h.maxprobe