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Use sensible maths for from_rational (#13660)

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* Use sensible maths for from_rational

* Fixes

* Fixes

* More fixes

* Remove debugging

* Add fuzzer tests

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Prevent panics

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* docs

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Clean up old code

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Test all rounding modes of from_rational

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Clean up code

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Revert "Prevent panics"

This reverts commit 7e88ac76138a1b590e68b68318505b69efe1e1f6.

* fix imports

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* cleanup

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fuzz test multiply_rational

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fix import

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* fmt

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Return None in multiply_rational on zero div

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
This commit is contained in:
Gavin Wood
2023-03-24 14:48:37 +00:00
committed by GitHub
parent 40e1704e1c
commit 2c77f8f4ca
12 changed files with 372 additions and 227 deletions
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substrate/primitives/arithmetic/src/helpers_128bit.rs
+2 -2
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@@ -182,8 +182,8 @@ mod double128 {
}
}
/// Returns `a * b / c` and `(a * b) % c` (wrapping to 128 bits) or `None` in the case of
/// overflow and c = 0.
/// Returns `a * b / c` (wrapping to 128 bits) or `None` in the case of
/// overflow.
pub const fn multiply_by_rational_with_rounding(
a: u128,
b: u128,