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| 2 | |
| 3 |
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| 4 |
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| 5 | #include <linux/export.h>
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| 6 | #include <linux/libgcc.h>
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| 7 |
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| 8 | #define W_TYPE_SIZE 32
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| 9 |
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| 10 | #define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
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| 11 | #define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
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| 12 | #define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
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| 13 |
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| 14 |
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| 15 | #if !defined(umul_ppmm)
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| 16 | #define umul_ppmm(w1, w0, u, v) \
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| 17 | do { \
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| 18 | unsigned long __x0, __x1, __x2, __x3; \
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| 19 | unsigned short __ul, __vl, __uh, __vh; \
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| 20 | \
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| 21 | __ul = __ll_lowpart(u); \
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| 22 | __uh = __ll_highpart(u); \
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| 23 | __vl = __ll_lowpart(v); \
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| 24 | __vh = __ll_highpart(v); \
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| 25 | \
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| 26 | __x0 = (unsigned long) __ul * __vl; \
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| 27 | __x1 = (unsigned long) __ul * __vh; \
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| 28 | __x2 = (unsigned long) __uh * __vl; \
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| 29 | __x3 = (unsigned long) __uh * __vh; \
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| 30 | \
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| 31 | __x1 += __ll_highpart(__x0); \
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| 32 | __x1 += __x2; \
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| 33 | if (__x1 < __x2) \
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| 34 | __x3 += __ll_B; \
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| 35 | \
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| 36 | (w1) = __x3 + __ll_highpart(__x1); \
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| 37 | (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
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| 38 | } while (0)
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| 39 | #endif
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| 40 |
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| 41 | #if !defined(__umulsidi3)
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| 42 | #define __umulsidi3(u, v) ({ \
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| 43 | DWunion __w; \
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| 44 | umul_ppmm(__w.s.high, __w.s.low, u, v); \
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| 45 | __w.ll; \
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| 46 | })
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| 47 | #endif
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| 48 |
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| 49 | long long notrace __muldi3(long long u, long long v)
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| 50 | {
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| 51 | const DWunion uu = {.ll = u};
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| 52 | const DWunion vv = {.ll = v};
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| 53 | DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
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| 54 |
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| 55 | w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high
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| 56 | + (unsigned long) uu.s.high * (unsigned long) vv.s.low);
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| 57 |
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| 58 | return w.ll;
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| 59 | }
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| 60 | EXPORT_SYMBOL(__muldi3);
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