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3927f2e8f9
Here is the current version of the 64 bit divide common code. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
116 lines
2.4 KiB
C
116 lines
2.4 KiB
C
/*
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* Copyright (C) 2000, 2004 Maciej W. Rozycki
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* Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_DIV64_H
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#define _ASM_DIV64_H
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#include <linux/types.h>
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#if (_MIPS_SZLONG == 32)
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#include <asm/compiler.h>
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/*
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* No traps on overflows for any of these...
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*/
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#define do_div64_32(res, high, low, base) ({ \
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unsigned long __quot, __mod; \
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unsigned long __cf, __tmp, __tmp2, __i; \
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\
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__asm__(".set push\n\t" \
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".set noat\n\t" \
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".set noreorder\n\t" \
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"move %2, $0\n\t" \
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"move %3, $0\n\t" \
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"b 1f\n\t" \
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" li %4, 0x21\n" \
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"0:\n\t" \
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"sll $1, %0, 0x1\n\t" \
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"srl %3, %0, 0x1f\n\t" \
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"or %0, $1, %5\n\t" \
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"sll %1, %1, 0x1\n\t" \
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"sll %2, %2, 0x1\n" \
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"1:\n\t" \
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"bnez %3, 2f\n\t" \
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" sltu %5, %0, %z6\n\t" \
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"bnez %5, 3f\n" \
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"2:\n\t" \
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" addiu %4, %4, -1\n\t" \
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"subu %0, %0, %z6\n\t" \
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"addiu %2, %2, 1\n" \
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"3:\n\t" \
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"bnez %4, 0b\n\t" \
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" srl %5, %1, 0x1f\n\t" \
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".set pop" \
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: "=&r" (__mod), "=&r" (__tmp), "=&r" (__quot), "=&r" (__cf), \
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"=&r" (__i), "=&r" (__tmp2) \
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: "Jr" (base), "0" (high), "1" (low)); \
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\
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(res) = __quot; \
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__mod; })
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#define do_div(n, base) ({ \
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unsigned long long __quot; \
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unsigned long __mod; \
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unsigned long long __div; \
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unsigned long __upper, __low, __high, __base; \
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\
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__div = (n); \
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__base = (base); \
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\
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__high = __div >> 32; \
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__low = __div; \
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__upper = __high; \
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\
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if (__high) \
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__asm__("divu $0, %z2, %z3" \
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: "=h" (__upper), "=l" (__high) \
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: "Jr" (__high), "Jr" (__base) \
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: GCC_REG_ACCUM); \
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\
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__mod = do_div64_32(__low, __upper, __low, __base); \
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\
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__quot = __high; \
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__quot = __quot << 32 | __low; \
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(n) = __quot; \
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__mod; })
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extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
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#endif /* (_MIPS_SZLONG == 32) */
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#if (_MIPS_SZLONG == 64)
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/*
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* Hey, we're already 64-bit, no
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* need to play games..
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*/
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#define do_div(n, base) ({ \
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unsigned long __quot; \
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unsigned int __mod; \
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unsigned long __div; \
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unsigned int __base; \
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\
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__div = (n); \
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__base = (base); \
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\
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__mod = __div % __base; \
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__quot = __div / __base; \
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\
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(n) = __quot; \
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__mod; })
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static inline uint64_t div64_64(uint64_t dividend, uint64_t divisor)
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{
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return dividend / divisor;
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}
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#endif /* (_MIPS_SZLONG == 64) */
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#endif /* _ASM_DIV64_H */
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