| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | #include <linux/export.h> |
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| 3 | |
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| 4 | #include "libgcc.h" |
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| 5 | |
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| 6 | #define W_TYPE_SIZE 32 |
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| 7 | |
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| 8 | #define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2)) |
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| 9 | #define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1)) |
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| 10 | #define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2)) |
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| 11 | |
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| 12 | /* If we still don't have umul_ppmm, define it using plain C. */ |
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| 13 | #if !defined(umul_ppmm) |
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| 14 | #define umul_ppmm(w1, w0, u, v) \ |
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| 15 | do { \ |
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| 16 | unsigned long __x0, __x1, __x2, __x3; \ |
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| 17 | unsigned short __ul, __vl, __uh, __vh; \ |
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| 18 | \ |
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| 19 | __ul = __ll_lowpart(u); \ |
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| 20 | __uh = __ll_highpart(u); \ |
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| 21 | __vl = __ll_lowpart(v); \ |
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| 22 | __vh = __ll_highpart(v); \ |
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| 23 | \ |
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| 24 | __x0 = (unsigned long) __ul * __vl; \ |
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| 25 | __x1 = (unsigned long) __ul * __vh; \ |
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| 26 | __x2 = (unsigned long) __uh * __vl; \ |
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| 27 | __x3 = (unsigned long) __uh * __vh; \ |
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| 28 | \ |
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| 29 | __x1 += __ll_highpart(__x0); /* this can't give carry */\ |
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| 30 | __x1 += __x2; /* but this indeed can */ \ |
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| 31 | if (__x1 < __x2) /* did we get it? */ \ |
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| 32 | __x3 += __ll_B; /* yes, add it in the proper pos */ \ |
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| 33 | \ |
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| 34 | (w1) = __x3 + __ll_highpart(__x1); \ |
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| 35 | (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\ |
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| 36 | } while (0) |
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| 37 | #endif |
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| 38 | |
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| 39 | #if !defined(__umulsidi3) |
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| 40 | #define __umulsidi3(u, v) ({ \ |
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| 41 | DWunion __w; \ |
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| 42 | umul_ppmm(__w.s.high, __w.s.low, u, v); \ |
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| 43 | __w.ll; \ |
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| 44 | }) |
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| 45 | #endif |
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| 46 | |
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| 47 | long long __muldi3(long long u, long long v) |
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| 48 | { |
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| 49 | const DWunion uu = {.ll = u}; |
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| 50 | const DWunion vv = {.ll = v}; |
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| 51 | DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; |
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| 52 | |
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| 53 | w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high |
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| 54 | + (unsigned long) uu.s.high * (unsigned long) vv.s.low); |
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| 55 | |
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| 56 | return w.ll; |
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| 57 | } |
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| 58 | EXPORT_SYMBOL(__muldi3); |
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| 59 | |
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