forked from mirrors/linux
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>
41 lines
875 B
C
41 lines
875 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* include/lib/libgcc.h
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*/
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#ifndef __LIB_LIBGCC_H
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#define __LIB_LIBGCC_H
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#include <asm/byteorder.h>
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typedef int word_type __attribute__ ((mode (__word__)));
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#ifdef __BIG_ENDIAN
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struct DWstruct {
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int high, low;
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};
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#elif defined(__LITTLE_ENDIAN)
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struct DWstruct {
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int low, high;
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};
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#else
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#error I feel sick.
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#endif
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typedef union {
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struct DWstruct s;
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long long ll;
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} DWunion;
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long long notrace __ashldi3(long long u, word_type b);
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long long notrace __ashrdi3(long long u, word_type b);
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word_type notrace __cmpdi2(long long a, long long b);
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long long notrace __lshrdi3(long long u, word_type b);
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long long notrace __muldi3(long long u, long long v);
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word_type notrace __ucmpdi2(unsigned long long a, unsigned long long b);
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#ifdef CONFIG_HAVE_ARCH_LIBGCC_H
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#include <asm/libgcc.h>
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#endif
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#endif /* __ASM_LIBGCC_H */
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