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Add shim for ldexp

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This commit is contained in:
Christian Poveda 2019-08-02 13:42:10 -05:00
parent 079b53e70e
commit ff2001040f
2 changed files with 14 additions and 2 deletions
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12
src/shims/foreign_items.rs
View file

@ -603,7 +603,15 @@ 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" => {
this.write_scalar(Scalar::from_int(0, dest.layout.size), dest)?;
@ -973,4 +981,4 @@ 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); }
}