fix flonum hashing regression from r45384

* st.c (st_numhash): mix float value for flonum
* hash.c (rb_any_hash): ditto
* benchmark/bm_hash_aref_flo.rb: new benchmark
* benchmark/bm_hash_ident_flo.rb: ditto
  [Bug #10761]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49376 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index d54ab8ada5..b7e2c66849 100644
--- a/hash.c
+++ b/hash.c
@@ -137,7 +137,13 @@ rb_any_hash(VALUE a)
 
     if (SPECIAL_CONST_P(a)) {
 	if (a == Qundef) return 0;
-	if (STATIC_SYM_P(a)) a >>= (RUBY_SPECIAL_SHIFT + ID_SCOPE_SHIFT);
+	if (STATIC_SYM_P(a)) {
+	    a >>= (RUBY_SPECIAL_SHIFT + ID_SCOPE_SHIFT);
+	}
+	else if (FLONUM_P(a)) {
+	    /* prevent pathological behavior: [Bug #10761] */
+	    a = (st_index_t)rb_float_value(a);
+	}
 	hnum = rb_objid_hash((st_index_t)a);
     }
     else if (BUILTIN_TYPE(a) == T_STRING) {