| /* |
| * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com> |
| * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h |
| * |
| * Optimization for constant divisors on 32-bit machines: |
| * Copyright (C) 2006-2015 Nicolas Pitre |
| * |
| * The semantics of do_div() are: |
| * |
| * uint32_t do_div(uint64_t *n, uint32_t base) |
| * { |
| * uint32_t remainder = *n % base; |
| * *n = *n / base; |
| * return remainder; |
| * } |
| * |
| * NOTE: macro parameter n is evaluated multiple times, |
| * beware of side effects! |
| */ |
| |
| #pragma once |
| |
| #include <sys/types.h> |
| |
| #if BITS_PER_LONG == 64 |
| |
| # define do_div(n,base) ({ \ |
| uint32_t __base = (base); \ |
| uint32_t __rem; \ |
| __rem = ((uint64_t)(n)) % __base; \ |
| (n) = ((uint64_t)(n)) / __base; \ |
| __rem; \ |
| }) |
| |
| #else /* BITS_PER_LONG == ?? */ |
| |
| # error "BITS_PER_LONG isn't #defined 64" |
| |
| #endif /* BITS_PER_LONG */ |
