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27 lines
620 B
C
27 lines
620 B
C
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#ifndef COSMOPOLITAN_LIBC_FMT_DIVMOD10_H_
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#define COSMOPOLITAN_LIBC_FMT_DIVMOD10_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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forceinline uint64_t DivMod10(uint64_t x, unsigned *r) {
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#if defined(__STRICT_ANSI__) || !defined(__GNUC__) || \
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(defined(__OPTIMIZE__) && !defined(__OPTIMIZE_SIZE__))
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*r = x % 10;
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return x / 10;
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#else
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uint128_t dw;
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unsigned long long hi, rm;
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dw = x;
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dw *= 0xcccccccccccccccdull;
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hi = dw >> 64;
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hi >>= 3;
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rm = hi;
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rm += rm << 2;
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rm += rm;
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*r = x - rm;
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return hi;
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#endif
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}
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_FMT_DIVMOD10_H_ */
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