[PATCH] Add __pure2 to __locale_ctype_ptr

[Corinna Vinschen]

On Oct 23 17:16, Wilco Dijkstra wrote:
> The newlib ctype functons are extremely inefficient due to repeatedly
> calling __locale_ctype_ptr for every single use of a ctype macro, even
> in a tight loop.  Improve this by adding the missing __pure2 attribute so
> the pointer can be cached just like in GLIBC, resulting in > 2x speedup
> in loops.
> 
> I haven't looked in detail at the implementation, but in general you don't
> need a function call - a variable, thread-local if required, would be simpler,
> even faster and cache automatically.
> 
> ChangeLog:
> 2017-10-22  Wilco Dijkstra  <wdijkstr@arm.com>
> 
>         * newlib/libc/include/ctype.h (__locale_ctype_ptr): Add __pure2.
> 
> --
> diff --git a/newlib/libc/include/ctype.h b/newlib/libc/include/ctype.h
> index 06458cbda47abe1294ebe226a16981fc9f38254d..e08120e88841eed77d2953e6a5f2f954f10de1e7 100644
> --- a/newlib/libc/include/ctype.h
> +++ b/newlib/libc/include/ctype.h
> @@ -66,7 +66,7 @@ extern int toascii_l (int __c, locale_t __l);
>  #define _X	0100
>  #define	_B	0200
>  
> -const char *__locale_ctype_ptr (void);
> +const char *__locale_ctype_ptr (void) __pure2;
>  # define __CTYPE_PTR	(__locale_ctype_ptr ())
>  
>  #ifndef __cplusplus

Same for __locale_ctype_ptr_l() I guess?


Thanks.
Corinna

-- 
Corinna Vinschen
Cygwin Maintainer
Red Hat
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