Jerry Zhao
1 year ago
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1 changed files with
3 additions and
3 deletions
-
riscv/arith.h
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@ -32,15 +32,15 @@ inline uint64_t mulhu(uint64_t a, uint64_t b) |
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inline int64_t mulh(int64_t a, int64_t b) |
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{ |
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int negate = (a < 0) != (b < 0); |
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uint64_t res = mulhu(a < 0 ? -a : a, b < 0 ? -b : b); |
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uint64_t res = mulhu(a < 0 ? -(uint64_t)a : a, b < 0 ? -(uint64_t)b : b); |
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return negate ? ~res + ((uint64_t)a * (uint64_t)b == 0) : res; |
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} |
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inline int64_t mulhsu(int64_t a, uint64_t b) |
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{ |
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int negate = a < 0; |
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uint64_t res = mulhu(a < 0 ? -a : a, b); |
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return negate ? ~res + (a * b == 0) : res; |
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uint64_t res = mulhu(a < 0 ? -(uint64_t)a : a, b); |
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return negate ? ~res + ((uint64_t)a * b == 0) : res; |
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} |
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//ref: https://locklessinc.com/articles/sat_arithmetic/
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