Inlined and specialised hash table look-up

This improves performance in several ways.  Separate functions are
used depending on whether the caller has a hash value computed or not.

* src/fns.c (hash_lookup_with_hash, hash_lookup_get_hash): New.
(hash_lookup): Remove hash return argument.
All callers adapted.

hash_lookup_with_hash hash_hash_t arg

1 files changed, 1 insertions, 1 deletions

diff --git a/src/coding.h b/src/coding.h
index e9b72403c6b..9beb4350bbf 100644
--- a/src/coding.h
+++ b/src/coding.h
@@ -194,7 +194,7 @@ enum coding_attr_index
 
 #define CODING_SYSTEM_ID(coding_system_symbol)                  \
   hash_lookup (XHASH_TABLE (Vcoding_system_hash_table),         \
-               coding_system_symbol, NULL)
+               coding_system_symbol)
 
 /* Return true if CODING_SYSTEM_SYMBOL is a coding system.  */