135 lines
2.9 KiB
C
Executable File
135 lines
2.9 KiB
C
Executable File
/*
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* include/asm-mips/div64.h
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*
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* Copyright (C) 2000 Maciej W. Rozycki
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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/sgidefs.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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#if (_MIPS_ISA == _MIPS_ISA_MIPS1 ) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
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(_MIPS_ISA == _MIPS_ISA_MIPS32)
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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, __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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"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,$2\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 $2,%0,%z5\n\t" \
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"bnez $2,3f\n\t" \
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"2:\n\t" \
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" addiu %4,%4,-1\n\t" \
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"subu %0,%0,%z5\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 $2,%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) \
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: "Jr" (base), "0" (high), "1" (low), "2" (0), "3" (0) \
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/* Aarrgh! Ran out of gcc's limit on constraints... */ \
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: "$1", "$2"); \
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\
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(res) = __quot; \
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__mod; })
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#if (CONFIG_TOOLCHAIN_VER == 493)
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#define do_div(n, base) ({ \
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unsigned long long __quot; \
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unsigned long __upper, __low, __high, __mod; \
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\
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__quot = (n); \
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__high = __quot >> 32; \
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__low = __quot; \
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__upper = __high; \
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\
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if (__high) \
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{__upper = __high % base; __high = __high / base; } \
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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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#else
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#define do_div(n, base) ({ \
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unsigned long long __quot; \
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unsigned long __upper, __low, __high, __mod; \
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\
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__quot = (n); \
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__high = __quot >> 32; \
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__low = __quot; \
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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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\
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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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#endif
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#else
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#define do_div64_32(res, high, low, base) ({ \
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unsigned long __quot, __mod, __r0; \
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\
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__asm__("dsll32 %2,%z3,0\n\t" \
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"or %2,%2,%z4\n\t" \
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"ddivu $0,%2,%z5" \
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: "=h" (__mod), "=l" (__quot), "=&r" (__r0) \
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: "Jr" (high), "Jr" (low), "Jr" (base)); \
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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, __r0; \
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\
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__quot = (n); \
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\
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__asm__("dsll32 %2,%M3,0\n\t" \
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"or %2,%2,%L3\n\t" \
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"ddivu $0,%2,%z4\n\t" \
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"mflo %L1\n\t" \
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"dsra32 %M1,%L1,0\n\t" \
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"dsll32 %L1,%L1,0\n\t" \
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"dsra32 %L1,%L1,0" \
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: "=h" (__mod), "=r" (__quot), "=&r" (__r0) \
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: "r" (n), "Jr" (base)); \
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\
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(n) = __quot; \
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__mod; })
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#endif
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#endif /* _ASM_DIV64_H */
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