Re: [PATCH] Modernize i386 string.h

[Jeff Garzik]

Andi Kleen wrote:
> This patch modernizes i386 string.h. It removes all the fragile i386
> inline str* functions and just switches to gcc's builtin variants.
> Modern gcc should generate equivalent or better code. Sometimes it
> calls out-of-line code, in that case the standard C functions in
> lib/string.c is used. 
[...]
> diff -u linux-string/arch/i386/kernel/i386_ksyms.c-STRING linux-string/arch/i386/kernel/i386_ksyms.c
> --- linux-string/arch/i386/kernel/i386_ksyms.c-STRING	2003-10-09 00:28:44.000000000 +0200
> +++ linux-string/arch/i386/kernel/i386_ksyms.c	2004-01-18 13:26:36.479533784 +0100
> @@ -133,6 +133,38 @@
>  EXPORT_SYMBOL(pcibios_get_irq_routing_table);
>  #endif
>  
> +/* Export string functions. We normally rely on gcc builtin for most of these,
> +   but gcc sometimes decides not to inline them. */    
> +#undef memchr
> +#undef strlen
> +#undef strcpy
> +#undef strncmp
> +#undef strncpy
> +#undef strchr	
> +#undef strcmp 
> +#undef strcpy 
> +#undef strcat
> +
> +extern size_t strlen(const char *);
> +extern char * strcpy(char * dest,const char *src);
> +extern int strcmp(const char * cs,const char * ct);
> +extern void *memchr(const void *s, int c, size_t n);
> +extern char * strcat(char *, const char *);

ISTR this patch being shot down in the past...

It seems suboptimal for people with ancient compilers, or for people on 
embedded 486's, doesn't it?

	Jeff



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