mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-16 21:35:07 +00:00
e419ddeabe
Use the kernels own generic lib/muldi3.c implementation of muldi3 for 68K machines. Some 68K CPUs support 64bit multiplies so move the arch specific umul_ppmm() macro into a header file that is included by lib/muldi3.c. That way it can take advantage of the single instruction when available. There does not appear to be any existing mechanism for the generic lib/muldi3.c code to pick up an external arch definition of umul_ppmm(). Create an arch specific libgcc.h that can optionally be included by the system include/linux/libgcc.h to allow for this. Somewhat oddly there is also a similar definition of umul_ppmm() in the non-architecture code in lib/crypto/mpi/longlong.h for a wide range or machines. Its presence ends up complicating the include setup and means not being able to use something like compiler.h instead. Actually there is a few other defines of umul_ppmm() macros spread around in various architectures, but not directly usable for the m68k case. Signed-off-by: Greg Ungerer <gerg@linux-m68k.org> Link: https://lore.kernel.org/20231113133209.1367286-1-gerg@linux-m68k.org Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
42 lines
875 B
C
42 lines
875 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* include/lib/libgcc.h
|
|
*/
|
|
|
|
#ifndef __LIB_LIBGCC_H
|
|
#define __LIB_LIBGCC_H
|
|
|
|
#include <asm/byteorder.h>
|
|
|
|
typedef int word_type __attribute__ ((mode (__word__)));
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
struct DWstruct {
|
|
int high, low;
|
|
};
|
|
#elif defined(__LITTLE_ENDIAN)
|
|
struct DWstruct {
|
|
int low, high;
|
|
};
|
|
#else
|
|
#error I feel sick.
|
|
#endif
|
|
|
|
typedef union {
|
|
struct DWstruct s;
|
|
long long ll;
|
|
} DWunion;
|
|
|
|
long long notrace __ashldi3(long long u, word_type b);
|
|
long long notrace __ashrdi3(long long u, word_type b);
|
|
word_type notrace __cmpdi2(long long a, long long b);
|
|
long long notrace __lshrdi3(long long u, word_type b);
|
|
long long notrace __muldi3(long long u, long long v);
|
|
word_type notrace __ucmpdi2(unsigned long long a, unsigned long long b);
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_LIBGCC_H
|
|
#include <asm/libgcc.h>
|
|
#endif
|
|
|
|
#endif /* __ASM_LIBGCC_H */
|