Revision 7a51ad82 host-utils.c
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//#define DEBUG_MULDIV |
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/* Long integer helpers */ |
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#if !defined(__x86_64__) |
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static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) |
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{
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*plow += a; |
| ... | ... | |
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*phigh += v; |
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} |
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/* Unsigned 64x64 -> 128 multiplication */ |
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void mulu64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) |
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{
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#if defined(__x86_64__) |
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__asm__ ("mul %0\n\t"
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: "=d" (*phigh), "=a" (*plow) |
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: "a" (a), "0" (b)); |
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#else |
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mul64(plow, phigh, a, b); |
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#endif |
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#if defined(DEBUG_MULDIV) |
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printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
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a, b, *phigh, *plow); |
| ... | ... | |
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/* Signed 64x64 -> 128 multiplication */ |
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void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b) |
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{
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#if defined(__x86_64__) |
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__asm__ ("imul %0\n\t"
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: "=d" (*phigh), "=a" (*plow) |
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: "a" (a), "0" (b)); |
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#else |
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int sa, sb; |
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sa = (a < 0); |
| ... | ... | |
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if (sa ^ sb) {
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neg128(plow, phigh); |
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} |
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#endif |
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#if defined(DEBUG_MULDIV) |
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printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
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a, b, *phigh, *plow); |
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#endif |
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} |
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#endif /* !defined(__x86_64__) */ |
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