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- /*
- * U-Boot - muldi3.c contains routines for mult and div
- *
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
- /* Generic function got from GNU gcc package, libgcc2.c */
- #ifndef SI_TYPE_SIZE
- #define SI_TYPE_SIZE 32
- #endif
- #define __ll_B (1L << (SI_TYPE_SIZE / 2))
- #define __ll_lowpart(t) ((USItype) (t) % __ll_B)
- #define __ll_highpart(t) ((USItype) (t) / __ll_B)
- #define BITS_PER_UNIT 8
- #if !defined(umul_ppmm)
- #define umul_ppmm(w1, w0, u, v) \
- do { \
- USItype __x0, __x1, __x2, __x3; \
- USItype __ul, __vl, __uh, __vh; \
- \
- __ul = __ll_lowpart(u); \
- __uh = __ll_highpart(u); \
- __vl = __ll_lowpart(v); \
- __vh = __ll_highpart(v); \
- \
- __x0 = (USItype) __ul * __vl; \
- __x1 = (USItype) __ul * __vh; \
- __x2 = (USItype) __uh * __vl; \
- __x3 = (USItype) __uh * __vh; \
- \
- __x1 += __ll_highpart(__x0); /* this can't give carry */\
- __x1 += __x2; /* but this indeed can */ \
- if (__x1 < __x2) /* did we get it? */ \
- __x3 += __ll_B; /* yes, add it in the proper pos. */ \
- \
- (w1) = __x3 + __ll_highpart(__x1); \
- (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
- } while (0)
- #endif
- #if !defined(__umulsidi3)
- #define __umulsidi3(u, v) \
- ({DIunion __w; \
- umul_ppmm(__w.s.high, __w.s.low, u, v); \
- __w.ll; })
- #endif
- typedef unsigned int USItype __attribute__ ((mode(SI)));
- typedef int SItype __attribute__ ((mode(SI)));
- typedef int DItype __attribute__ ((mode(DI)));
- typedef int word_type __attribute__ ((mode(__word__)));
- struct DIstruct {
- SItype low, high;
- };
- typedef union {
- struct DIstruct s;
- DItype ll;
- } DIunion;
- DItype __muldi3(DItype u, DItype v)
- {
- DIunion w;
- DIunion uu, vv;
- uu.ll = u, vv.ll = v;
- /* panic("kernel panic for __muldi3"); */
- w.ll = __umulsidi3(uu.s.low, vv.s.low);
- w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
- + (USItype) uu.s.high * (USItype) vv.s.low);
- return w.ll;
- }
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