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45 lines
1.2 KiB
45 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include "libgcc.h" |
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#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2)) |
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#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1)) |
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#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2)) |
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#define umul_ppmm(w1, w0, u, v) \ |
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do { \ |
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UWtype __x0, __x1, __x2, __x3; \ |
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UHWtype __ul, __vl, __uh, __vh; \ |
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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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__x0 = (UWtype) __ul * __vl; \ |
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__x1 = (UWtype) __ul * __vh; \ |
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__x2 = (UWtype) __uh * __vl; \ |
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__x3 = (UWtype) __uh * __vh; \ |
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__x1 += __ll_highpart(__x0); \ |
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__x1 += __x2; \ |
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if (__x1 < __x2) \ |
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__x3 += __ll_B; \ |
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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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#define __umulsidi3(u, v) ( \ |
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{ \ |
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DWunion __w; \ |
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umul_ppmm(__w.s.high, __w.s.low, u, v); \ |
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__w.ll; } \ |
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) |
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DWtype __muldi3(DWtype u, DWtype v) |
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{ |
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const DWunion uu = {.ll = u}; |
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const DWunion vv = {.ll = v}; |
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DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; |
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w.s.high += ((UWtype) uu.s.low * (UWtype) vv.s.high |
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+ (UWtype) uu.s.high * (UWtype) vv.s.low); |
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return w.ll; |
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}
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