FEATURE: [fixedpoint] implement different mul mode #1800
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Welcome back! @c9s, This pull request may get 268 BBG. |
zenixls2
reviewed
Oct 31, 2024
| bigB := big.NewInt(int64(b)) | ||
| result := new(big.Int).Mul(bigA, bigB) | ||
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| // 恢復精度 (除以 10^8) |
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Please comment in English if possible
zenixls2
reviewed
Oct 31, 2024
| @@ -227,11 +229,11 @@ func (v Value) IsZero() bool { | |||
| } | |||
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| func Mul(x, y Value) Value { | |||
| return NewFromFloat(x.Float64() * y.Float64()) | |||
| return mulOp(x, y) | |||
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This might make the mul func slower since there's additional function call. Can you do some bench on the changes to convince people that this works better? Also it's rare that we need to multiply an integer.
narumiruna
reviewed
Oct 31, 2024
| result /= scaleFactor | ||
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| return result | ||
| } |
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func multiplyWithInt64(a, b Value) Value {
highA := a / 10000
lowA := a % 10000
highB := b / 10000
lowB := b % 10000
highResult := highA * highB
midResult1 := highA * lowB
midResult2 := lowA * highB
lowResult := lowA * lowB
result := (midResult1 + midResult2) + lowResult/10000
result /= 10000
result += highResult
return result
}
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