47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
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#include "libgcc.h"
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#define __ll_B ((u32) 1 << (32 / 2))
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#define __ll_lowpart(t) ((u32) (t) & (__ll_B - 1))
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#define __ll_highpart(t) ((u32) (t) >> 16)
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#define umul_ppmm(w1, w0, u, v) \
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do { \
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u32 __x0, __x1, __x2, __x3; \
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u16 __ul, __vl, __uh, __vh; \
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\
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__ul = __ll_lowpart (u); \
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__uh = __ll_highpart (u); \
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__vl = __ll_lowpart (v); \
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__vh = __ll_highpart (v); \
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\
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__x0 = (u32) __ul * __vl; \
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__x1 = (u32) __ul * __vh; \
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__x2 = (u32) __uh * __vl; \
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__x3 = (u32) __uh * __vh; \
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\
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__x1 += __ll_highpart (__x0);/* this can't give carry */ \
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__x1 += __x2; /* but this indeed can */ \
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if (__x1 < __x2) /* did we get it? */ \
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__x3 += __ll_B; /* yes, add it in the proper pos. */ \
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\
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(w1) = __x3 + __ll_highpart (__x1); \
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(w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
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} while (0)
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union DWunion {
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struct {
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s32 high;
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s32 low;
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} s;
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s64 ll;
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};
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u64 __umulsidi3(u32 u, u32 v)
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{
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union DWunion __w;
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umul_ppmm(__w.s.high, __w.s.low, u, v);
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return __w.ll;
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}
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