50 строки
1.3 KiB
C
50 строки
1.3 KiB
C
#ifndef __S390_DIV64
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#define __S390_DIV64
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#ifndef __s390x__
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/* for do_div "base" needs to be smaller than 2^31-1 */
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#define do_div(n, base) ({ \
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unsigned long long __n = (n); \
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unsigned long __r; \
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\
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asm (" slr 0,0\n" \
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" l 1,%1\n" \
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" srdl 0,1\n" \
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" dr 0,%2\n" \
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" alr 1,1\n" \
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" alr 0,0\n" \
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" lhi 2,1\n" \
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" n 2,%1\n" \
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" alr 0,2\n" \
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" clr 0,%2\n" \
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" jl 0f\n" \
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" slr 0,%2\n" \
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" ahi 1,1\n" \
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"0: st 1,%1\n" \
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" l 1,4+%1\n" \
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" srdl 0,1\n" \
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" dr 0,%2\n" \
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" alr 1,1\n" \
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" alr 0,0\n" \
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" lhi 2,1\n" \
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" n 2,4+%1\n" \
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" alr 0,2\n" \
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" clr 0,%2\n" \
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" jl 1f\n" \
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" slr 0,%2\n" \
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" ahi 1,1\n" \
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"1: st 1,4+%1\n" \
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" lr %0,0" \
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: "=d" (__r), "=m" (__n) \
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: "d" (base), "m" (__n) : "0", "1", "2", "cc" ); \
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(n) = (__n); \
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__r; \
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})
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#else /* __s390x__ */
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#include <asm-generic/div64.h>
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#endif /* __s390x__ */
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#endif
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