mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Auto merge of #877 - christianpoveda:ldexp-shim, r=RalfJung

Browse Source 
Add shim for ldexp

Fixes https://github.com/rust-lang/miri/issues/821

r? @RalfJung
This commit is contained in:
bors 2019-08-03 16:14:20 +00:00
commit d0e8850267
2 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/shims/foreign_items.rs
View File

@ -602,6 +602,15 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
};
this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
}
// underscore case for windows
"_ldexp" | "ldexp" => {
// FIXME: Using host floats.
let x = f64::from_bits(this.read_scalar(args[0])?.to_u64()?);
let exp = this.read_scalar(args[1])?.to_i32()?;
// FIXME: We should use cmath if there are any imprecisions.
let n = x * 2.0f64.powi(exp);
this.write_scalar(Scalar::from_u64(n.to_bits()), dest)?;
}
// Some things needed for `sys::thread` initialization to go through.
"signal" | "sigaction" | "sigaltstack" => {
@ -974,4 +983,4 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
}
return Ok(None);
}
}
}

4
tests/run-pass/intrinsics-math.rs
View File

@ -85,4 +85,8 @@ pub fn main() {
assert_approx_eq!(1.0f32.tan(), 1.557408f32);
assert_approx_eq!(1.0f64.tan(), 1.557408f64);
extern {
fn ldexp(x: f64, n: i32) -> f64;
}
unsafe { assert_approx_eq!(ldexp(0.65f64, 3i32), 5.2f64); }
}