Hi,
On Tue, 7 Feb 2006, Andi Kleen wrote:
> If you feel the need to remove some more code: Now that gcc 2.95 isn't supported
> anymore there isn't really a need to keep the handwritten inline string functions
> in asm-i386/string.h around. Just declaring them as normal externs will cause
> gcc to use its builtin expansions, which are typically better than these old inline
> functions with inline assembly.
>
> For out of line the C versions in lib/string.c can be used (by not setting __ARCH_*)
> x86-64 did it like this forever and I guess it would be valuable cleanup for i386 too.
The only problem is that we compile with -ffreestanding which implies
-fno-builtin, so just declaring them as normal externs is not enough and
you have to something like this:
#define __HAVE_ARCH_MEMSET
extern void *memset(void *, int, __kernel_size_t);
#define memset(d, c, n) __builtin_memset(d, c, n)
(BTW you do this already in x86-64.)
Another problem here is because of -fno-builtin it's not easy to use the
generic functions as fallback. x86-64 basically does this:
#define strlen __builtin_strlen
size_t strlen(const char * s);
#ifndef __HAVE_ARCH_STRLEN
extern __kernel_size_t strlen(const char *);
#endif
This means you define a prototype for the builtin function and not for the
normal function. I'm not sure this is really intended.
bye, Roman
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