diff options
Diffstat (limited to 'kernel/arch/h8300/lib/muldi3.c')
| -rw-r--r-- | kernel/arch/h8300/lib/muldi3.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/kernel/arch/h8300/lib/muldi3.c b/kernel/arch/h8300/lib/muldi3.c new file mode 100644 index 000000000..790512243 --- /dev/null +++ b/kernel/arch/h8300/lib/muldi3.c @@ -0,0 +1,44 @@ +#include "libgcc.h" + +#define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2)) +#define __ll_lowpart(t) ((UWtype) (t) & (__ll_B - 1)) +#define __ll_highpart(t) ((UWtype) (t) >> (W_TYPE_SIZE / 2)) + +#define umul_ppmm(w1, w0, u, v) \ + do { \ + UWtype __x0, __x1, __x2, __x3; \ + UHWtype __ul, __vl, __uh, __vh; \ + __ul = __ll_lowpart(u); \ + __uh = __ll_highpart(u); \ + __vl = __ll_lowpart(v); \ + __vh = __ll_highpart(v); \ + __x0 = (UWtype) __ul * __vl; \ + __x1 = (UWtype) __ul * __vh; \ + __x2 = (UWtype) __uh * __vl; \ + __x3 = (UWtype) __uh * __vh; \ + __x1 += __ll_highpart(__x0); \ + __x1 += __x2; \ + if (__x1 < __x2) \ + __x3 += __ll_B; \ + (w1) = __x3 + __ll_highpart(__x1); \ + (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0); \ + } while (0) + +#define __umulsidi3(u, v) ( \ + { \ + DWunion __w; \ + umul_ppmm(__w.s.high, __w.s.low, u, v); \ + __w.ll; } \ + ) + +DWtype __muldi3(DWtype u, DWtype v) +{ + const DWunion uu = {.ll = u}; + const DWunion vv = {.ll = v}; + DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; + + w.s.high += ((UWtype) uu.s.low * (UWtype) vv.s.high + + (UWtype) uu.s.high * (UWtype) vv.s.low); + + return w.ll; +} |