92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/*
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* Copyright (C) 2000, 2004, 2021 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 <asm/bitsperlong.h>
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#if BITS_PER_LONG == 32
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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 __cf, __tmp, __tmp2, __i; \
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unsigned long __quot32, __mod32; \
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\
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__asm__( \
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" .set push \n" \
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" .set noat \n" \
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" .set noreorder \n" \
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" move %2, $0 \n" \
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" move %3, $0 \n" \
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" b 1f \n" \
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" li %4, 0x21 \n" \
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"0: \n" \
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" sll $1, %0, 0x1 \n" \
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" srl %3, %0, 0x1f \n" \
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" or %0, $1, %5 \n" \
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" sll %1, %1, 0x1 \n" \
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" sll %2, %2, 0x1 \n" \
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"1: \n" \
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" bnez %3, 2f \n" \
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" sltu %5, %0, %z6 \n" \
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" bnez %5, 3f \n" \
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"2: \n" \
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" addiu %4, %4, -1 \n" \
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" subu %0, %0, %z6 \n" \
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" addiu %2, %2, 1 \n" \
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"3: \n" \
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" bnez %4, 0b \n" \
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" srl %5, %1, 0x1f \n" \
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" .set pop" \
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: "=&r" (__mod32), "=&r" (__tmp), \
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"=&r" (__quot32), "=&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) = __quot32; \
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__mod32; \
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})
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#define __div64_32(n, base) ({ \
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unsigned long __upper, __low, __high, __radix; \
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unsigned long long __quot; \
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unsigned long long __div; \
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unsigned long __mod; \
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\
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__div = (*n); \
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__radix = (base); \
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\
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__high = __div >> 32; \
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__low = __div; \
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\
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if (__high < __radix) { \
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__upper = __high; \
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__high = 0; \
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} else { \
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__upper = __high % __radix; \
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__high /= __radix; \
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} \
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\
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__mod = do_div64_32(__low, __upper, __low, __radix); \
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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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})
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#endif /* BITS_PER_LONG == 32 */
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#include <asm-generic/div64.h>
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#endif /* __ASM_DIV64_H */
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