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27 lines
621 B
C
27 lines
621 B
C
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#ifndef _M68K_DIV64_H
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#define _M68K_DIV64_H
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/* n = n / base; return rem; */
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#define do_div(n, base) ({ \
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union { \
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unsigned long n32[2]; \
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unsigned long long n64; \
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} __n; \
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unsigned long __rem, __upper; \
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\
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__n.n64 = (n); \
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if ((__upper = __n.n32[0])) { \
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asm ("divul.l %2,%1:%0" \
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: "=d" (__n.n32[0]), "=d" (__upper) \
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: "d" (base), "0" (__n.n32[0])); \
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} \
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asm ("divu.l %2,%1:%0" \
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: "=d" (__n.n32[1]), "=d" (__rem) \
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: "d" (base), "1" (__upper), "0" (__n.n32[1])); \
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(n) = __n.n64; \
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__rem; \
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})
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#endif /* _M68K_DIV64_H */
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