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authornormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-03-22 23:34:21 +0000
committernormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2014-03-22 23:34:21 +0000
commitef59670a44f30df7f07dd7a1438a2c27652bcb3c (patch)
tree71d0daccc60c19f4d3a43ac3a444b6893cca2757 /hash.c
parent14c9cf885c2b486fcb5eade23ec4fcdc36ee87f0 (diff)
st.c: use power-of-two sizes to avoid slow modulo ops
* st.c (hash_pos): use bitwise AND to avoid slow modulo op (new_size): power-of-two sizes for hash_pos change (st_numhash): adjust for common keys due to lack of prime modulo [Feature #9425] * hash.c (rb_any_hash): right shift for symbols * benchmark/bm_hash_aref_miss.rb: added to show improvement * benchmark/bm_hash_aref_sym_long.rb: ditto * benchmark/bm_hash_aref_str.rb: ditto * benchmark/bm_hash_aref_sym.rb: ditto * benchmark/bm_hash_ident_num.rb: added to prevent regression * benchmark/bm_hash_ident_obj.rb: ditto * benchmark/bm_hash_ident_str.rb: ditto * benchmark/bm_hash_ident_sym.rb: ditto git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45384 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'hash.c')
-rw-r--r--hash.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/hash.c b/hash.c
index 0023e84..56917ed 100644
--- a/hash.c
+++ b/hash.c
@@ -132,6 +132,7 @@ rb_any_hash(VALUE a)
if (SPECIAL_CONST_P(a)) {
if (a == Qundef) return 0;
+ if (SYMBOL_P(a)) a >>= (RUBY_SPECIAL_SHIFT + 3); /* 3=ID_SCOPE_SHIFT */
hnum = rb_objid_hash((st_index_t)a);
}
else if (BUILTIN_TYPE(a) == T_STRING) {