projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| a71a29de YS |
2 | #include "libgcc.h" |
| 3 | ||
| 4 | #define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2)) | |
| 5 | #define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1)) | |
| 6 | #define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2)) | |
| 7 | ||
| 8 | #define umul_ppmm(w1, w0, u, v) \ | |
| 9 | do { \ | |
| 10 | UWtype __x0, __x1, __x2, __x3; \ | |
| 11 | UHWtype __ul, __vl, __uh, __vh; \ | |
| 12 | __ul = __ll_lowpart(u); \ | |
| 13 | __uh = __ll_highpart(u); \ | |
| 14 | __vl = __ll_lowpart(v); \ | |
| 15 | __vh = __ll_highpart(v); \ | |
| 16 | __x0 = (UWtype) __ul * __vl; \ | |
| 17 | __x1 = (UWtype) __ul * __vh; \ | |
| 18 | __x2 = (UWtype) __uh * __vl; \ | |
| 19 | __x3 = (UWtype) __uh * __vh; \ | |
| 20 | __x1 += __ll_highpart(__x0); \ | |
| 21 | __x1 += __x2; \ | |
| 22 | if (__x1 < __x2) \ | |
| 23 | __x3 += __ll_B; \ | |
| 24 | (w1) = __x3 + __ll_highpart(__x1); \ | |
| 25 | (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0); \ | |
| 26 | } while (0) | |
| 27 | ||
| 28 | #define __umulsidi3(u, v) ( \ | |
| 29 | { \ | |
| 30 | DWunion __w; \ | |
| 31 | umul_ppmm(__w.s.high, __w.s.low, u, v); \ | |
| 32 | __w.ll; } \ | |
| 33 | ) | |
| 34 | ||
| 35 | DWtype __muldi3(DWtype u, DWtype v) | |
| 36 | { | |
| 37 | const DWunion uu = {.ll = u}; | |
| 38 | const DWunion vv = {.ll = v}; | |
| 39 | DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; | |
| 40 | ||
| 41 | w.s.high += ((UWtype) uu.s.low * (UWtype) vv.s.high | |
| 42 | + (UWtype) uu.s.high * (UWtype) vv.s.low); | |
| 43 | ||
| 44 | return w.ll; | |
| 45 | } |