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Minor concat tweaks

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* src/fns.c (concat): Do things in the right order for speed.
(concat_strings): Initialise variable.
This commit is contained in:
Mattias Engdegård 2022-01-26 11:28:33 +01:00
parent 826959ccb4
commit a3aeee88aa
1 changed files with 7 additions and 9 deletions
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16
src/fns.c
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@ -790,9 +790,8 @@ concat_strings (ptrdiff_t nargs, Lisp_Object *args)
if (STRINGP (arg))
{
ptrdiff_t arg_len_byte;
ptrdiff_t arg_len_byte = SBYTES (arg);
len = SCHARS (arg);
arg_len_byte = SBYTES (arg);
if (STRING_MULTIBYTE (arg))
dest_multibyte = true;
else
@ -986,15 +985,16 @@ concat (ptrdiff_t nargs, Lisp_Object *args, Lisp_Object last_tail,
memory_full (SIZE_MAX);
}
/* When the target is a list, return the tail directly if all other
arguments are empty. */
if (!vector_target && result_len == 0)
return last_tail;
/* Create the output object. */
Lisp_Object result = vector_target
? make_nil_vector (result_len)
: Fmake_list (make_fixnum (result_len), Qnil);
/* In `append', if all but last arg are nil, return last arg. */
if (!vector_target && NILP (result))
return last_tail;
/* Copy the contents of the args into the result. */
Lisp_Object tail = Qnil;
ptrdiff_t toindex = 0;
@ -1022,14 +1022,12 @@ concat (ptrdiff_t nargs, Lisp_Object *args, Lisp_Object last_tail,
/* Fetch next element of `arg' arg into `elt', or break if
`arg' is exhausted. */
Lisp_Object elt;
if (NILP (arg))
break;
if (CONSP (arg))
{
elt = XCAR (arg);
arg = XCDR (arg);
}
else if (argindex >= arglen)
else if (NILP (arg) || argindex >= arglen)
break;
else if (STRINGP (arg))
{