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/* * Copyright (C) 2000, 2004, 2021 Maciej W. Rozycki * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org) * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #ifndef __ASM_DIV64_H #define __ASM_DIV64_H #include <asm/bitsperlong.h> #if BITS_PER_LONG == 32 /* * No traps on overflows for any of these... */ #define do_div64_32(res, high, low, base) ({ \ unsigned long __cf, __tmp, __tmp2, __i; \ unsigned long __quot32, __mod32; \ \ __asm__( \ " .set push \n" \ " .set noat \n" \ " .set noreorder \n" \ " move %2, $0 \n" \ " move %3, $0 \n" \ " b 1f \n" \ " li %4, 0x21 \n" \ "0: \n" \ " sll $1, %0, 0x1 \n" \ " srl %3, %0, 0x1f \n" \ " or %0, $1, %5 \n" \ " sll %1, %1, 0x1 \n" \ " sll %2, %2, 0x1 \n" \ "1: \n" \ " bnez %3, 2f \n" \ " sltu %5, %0, %z6 \n" \ " bnez %5, 3f \n" \ "2: \n" \ " addiu %4, %4, -1 \n" \ " subu %0, %0, %z6 \n" \ " addiu %2, %2, 1 \n" \ "3: \n" \ " bnez %4, 0b \n" \ " srl %5, %1, 0x1f \n" \ " .set pop" \ : "=&r" (__mod32), "=&r" (__tmp), \ "=&r" (__quot32), "=&r" (__cf), \ "=&r" (__i), "=&r" (__tmp2) \ : "Jr" (base), "0" (high), "1" (low)); \ \ (res) = __quot32; \ __mod32; \ }) #define __div64_32(n, base) ({ \ unsigned long __upper, __low, __high, __radix; \ unsigned long long __quot; \ unsigned long long __div; \ unsigned long __mod; \ \ __div = (*n); \ __radix = (base); \ \ __high = __div >> 32; \ __low = __div; \ \ if (__high < __radix) { \ __upper = __high; \ __high = 0; \ } else { \ __upper = __high % __radix; \ __high /= __radix; \ } \ \ __mod = do_div64_32(__low, __upper, __low, __radix); \ \ __quot = __high; \ __quot = __quot << 32 | __low; \ (*n) = __quot; \ __mod; \ }) #endif /* BITS_PER_LONG == 32 */ #include <asm-generic/div64.h> #endif /* __ASM_DIV64_H */
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