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/*
* include/asm-mips/div64.h
*
* Copyright (C) 2000 Maciej W. Rozycki
*
* 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/sgidefs.h>
/*
* No traps on overflows for any of these...
*/
#if (_MIPS_ISA == _MIPS_ISA_MIPS1 ) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
(_MIPS_ISA == _MIPS_ISA_MIPS32)
#define do_div64_32(res, high, low, base) ({ \
unsigned long __quot, __mod; \
unsigned long __cf, __tmp, __i; \
\
__asm__(".set push\n\t" \
".set noat\n\t" \
".set noreorder\n\t" \
"b 1f\n\t" \
" li %4,0x21\n" \
"0:\n\t" \
"sll $1,%0,0x1\n\t" \
"srl %3,%0,0x1f\n\t" \
"or %0,$1,$2\n\t" \
"sll %1,%1,0x1\n\t" \
"sll %2,%2,0x1\n" \
"1:\n\t" \
"bnez %3,2f\n\t" \
"sltu $2,%0,%z5\n\t" \
"bnez $2,3f\n\t" \
"2:\n\t" \
" addiu %4,%4,-1\n\t" \
"subu %0,%0,%z5\n\t" \
"addiu %2,%2,1\n" \
"3:\n\t" \
"bnez %4,0b\n\t" \
" srl $2,%1,0x1f\n\t" \
".set pop" \
: "=&r" (__mod), "=&r" (__tmp), "=&r" (__quot), "=&r" (__cf), \
"=&r" (__i) \
: "Jr" (base), "0" (high), "1" (low), "2" (0), "3" (0) \
/* Aarrgh! Ran out of gcc's limit on constraints... */ \
: "$1", "$2"); \
\
(res) = __quot; \
__mod; })
#define do_div(n, base) ({ \
unsigned long long __quot; \
unsigned long __upper, __low, __high, __mod; \
\
__quot = (n); \
__high = __quot >> 32; \
__low = __quot; \
__upper = __high; \
\
if (__high) \
__asm__("divu $0,%z2,%z3" \
: "=h" (__upper), "=l" (__high) \
: "Jr" (__high), "Jr" (base)); \
\
__mod = do_div64_32(__low, __upper, __low, base); \
\
__quot = __high; \
__quot = __quot << 32 | __low; \
(n) = __quot; \
__mod; })
#else
#define do_div64_32(res, high, low, base) ({ \
unsigned long __quot, __mod, __r0; \
\
__asm__("dsll32 %2,%z3,0\n\t" \
"or %2,%2,%z4\n\t" \
"ddivu $0,%2,%z5" \
: "=h" (__mod), "=l" (__quot), "=&r" (__r0) \
: "Jr" (high), "Jr" (low), "Jr" (base)); \
\
(res) = __quot; \
__mod; })
#define do_div(n, base) ({ \
unsigned long long __quot; \
unsigned long __mod, __r0; \
\
__quot = (n); \
\
__asm__("dsll32 %2,%M3,0\n\t" \
"or %2,%2,%L3\n\t" \
"ddivu $0,%2,%z4\n\t" \
"mflo %L1\n\t" \
"dsra32 %M1,%L1,0\n\t" \
"dsll32 %L1,%L1,0\n\t" \
"dsra32 %L1,%L1,0" \
: "=h" (__mod), "=r" (__quot), "=&r" (__r0) \
: "r" (n), "Jr" (base)); \
\
(n) = __quot; \
__mod; })
#endif
#endif /* _ASM_DIV64_H */
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