/[packages]/cauldron/rust/current/SOURCES/typenum-pr115-fix-log2-rounding-error.patch
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revision 1399020 by akien, Thu May 9 00:07:15 2019 UTC revision 1399021 by akien, Fri May 24 12:06:02 2019 UTC
# Line 1  Line 1 
1  From 0d5196feadafa77c727f517d747ffcf3fd0e8ba9 Mon Sep 17 00:00:00 2001  From 0d5196feadafa77c727f517d747ffcf3fd0e8ba9 Mon Sep 17 00:00:00 2001
2  From: Michael Hudson-Doyle <michael.hudson@canonical.com>  From: Michael Hudson-Doyle <michael.hudson@canonical.com>
3  Date: Wed, 13 Mar 2019 15:55:30 +1300  Date: Wed, 13 Mar 2019 15:55:30 +1300
4  Subject: [PATCH] round result of (highest as f64).log(2.0)  Subject: [PATCH] round result of (highest as f64).log(2.0)
5    
6  Even though (1024f64).log(2.0) has an exact, representable, value, with rustc 1.32 on i386 it comes out as +9.999999999999999985 with optimization enabled. And the rustc doesn't like having two defintions for U1024 etc.  Even though (1024f64).log(2.0) has an exact, representable, value, with rustc 1.32 on i386 it comes out as +9.999999999999999985 with optimization enabled. And the rustc doesn't like having two defintions for U1024 etc.
7  ---  ---
8   build/main.rs | 2 +-   build/main.rs | 2 +-
9   1 file changed, 1 insertion(+), 1 deletion(-)   1 file changed, 1 insertion(+), 1 deletion(-)
10    
11  diff --git a/build/main.rs b/build/main.rs  diff --git a/build/main.rs b/build/main.rs
12  index 16b0ffe2f..b7939f993 100644  index 16b0ffe2f..b7939f993 100644
13  --- a/vendor/typenum/build/main.rs  --- a/vendor/typenum/build/main.rs
14  +++ b/vendor/typenum/build/main.rs  +++ b/vendor/typenum/build/main.rs
15  @@ -81,7 +81,7 @@ pub fn no_std() {}  @@ -81,7 +81,7 @@ pub fn no_std() {}
16   fn main() {   fn main() {
17       let highest: u64 = 1024;       let highest: u64 = 1024;
18    
19  -    let first2: u32 = (highest as f64).log(2.0) as u32 + 1;  -    let first2: u32 = (highest as f64).log(2.0) as u32 + 1;
20  +    let first2: u32 = (highest as f64).log(2.0).round() as u32 + 1;  +    let first2: u32 = (highest as f64).log(2.0).round() as u32 + 1;
21       let first10: u32 = (highest as f64).log(10.0) as u32 + 1;       let first10: u32 = (highest as f64).log(10.0) as u32 + 1;
22       let uints = (0..(highest + 1))       let uints = (0..(highest + 1))
23           .chain((first2..64).map(|i| 2u64.pow(i)))           .chain((first2..64).map(|i| 2u64.pow(i)))
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