Fix bug in rustc_apfloat

Robin Kruppe · Robin Kruppe · commit 964ba2a6e731 · 2017-11-07T20:13:19.000+01:00
diff --git a/src/librustc_apfloat/lib.rs b/src/librustc_apfloat/lib.rs
@@ -378,7 +378,7 @@ pub trait Float
     fn from_bits(input: u128) -> Self;
     fn from_i128_r(input: i128, round: Round) -> StatusAnd<Self> {
         if input < 0 {
-            Self::from_u128_r(-input as u128, -round).map(|r| -r)
+            Self::from_u128_r(input.wrapping_neg() as u128, -round).map(|r| -r)
         } else {
             Self::from_u128_r(input as u128, round)
         }

Original file line number	Diff line number	Diff line change
`@@ -378,7 +378,7 @@ pub trait Float`
`378`	`378`	`fn from_bits(input: u128) -> Self;`
`379`	`379`	`fn from_i128_r(input: i128, round: Round) -> StatusAnd<Self> {`
`380`	`380`	`if input < 0 {`
`381`		`- Self::from_u128_r(-input as u128, -round).map(\|r\| -r)`
	`381`	`+ Self::from_u128_r(input.wrapping_neg() as u128, -round).map(\|r\| -r)`
`382`	`382`	`} else {`
`383`	`383`	`Self::from_u128_r(input as u128, round)`
`384`	`384`	`}`