Remove ConstFloat

2 files changed, 0 insertions, 222 deletions

diff --git a/src/librustc_const_math/float.rs b/src/librustc_const_math/float.rs
deleted file mode 100644
index 35cfe466c8a..00000000000
--- a/src/librustc_const_math/float.rs
+++ /dev/null
@@ -1,217 +0,0 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use std::cmp::Ordering;
-use std::num::ParseFloatError;
-
-use syntax::ast;
-
-use rustc_apfloat::{Float, FloatConvert, Status};
-use rustc_apfloat::ieee::{Single, Double};
-
-// Note that equality for `ConstFloat` means that the it is the same
-// constant, not that the rust values are equal. In particular, `NaN
-// == NaN` (at least if it's the same NaN; distinct encodings for NaN
-// are considering unequal).
-#[derive(Copy, Clone, PartialEq, Eq, Hash, RustcEncodable, RustcDecodable)]
-pub struct ConstFloat {
-    pub ty: ast::FloatTy,
-
-    // This is a bit inefficient but it makes conversions below more
-    // ergonomic, and all of this will go away once `miri` is merged.
-    pub bits: u128,
-}
-
-impl PartialOrd<ConstFloat> for ConstFloat {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        self.try_cmp(*other)
-    }
-}
-
-impl ConstFloat {
-    /// Description of the type, not the value
-    pub fn description(&self) -> &'static str {
-        self.ty.ty_to_string()
-    }
-
-    /// Compares the values if they are of the same type
-    fn try_cmp(self, rhs: Self) -> Option<Ordering> {
-        match (self.ty, rhs.ty) {
-            (ast::FloatTy::F64, ast::FloatTy::F64)  => {
-                let a = Double::from_bits(self.bits);
-                let b = Double::from_bits(rhs.bits);
-                // This is pretty bad but it is the existing behavior.
-                Some(a.partial_cmp(&b).unwrap_or(Ordering::Greater))
-            }
-
-            (ast::FloatTy::F32, ast::FloatTy::F32) => {
-                let a = Single::from_bits(self.bits);
-                let b = Single::from_bits(rhs.bits);
-                Some(a.partial_cmp(&b).unwrap_or(Ordering::Greater))
-            }
-
-            _ => None,
-        }
-    }
-
-    pub fn from_i128(input: i128, ty: ast::FloatTy) -> Self {
-        let bits = match ty {
-            ast::FloatTy::F32 => Single::from_i128(input).value.to_bits(),
-            ast::FloatTy::F64 => Double::from_i128(input).value.to_bits()
-        };
-        ConstFloat { bits, ty }
-    }
-
-    pub fn from_u128(input: u128, ty: ast::FloatTy) -> Self {
-        let bits = match ty {
-            ast::FloatTy::F32 => Single::from_u128(input).value.to_bits(),
-            ast::FloatTy::F64 => Double::from_u128(input).value.to_bits()
-        };
-        ConstFloat { bits, ty }
-    }
-
-    pub fn from_str(num: &str, ty: ast::FloatTy) -> Result<Self, ParseFloatError> {
-        let bits = match ty {
-            ast::FloatTy::F32 => {
-                let rust_bits = num.parse::<f32>()?.to_bits() as u128;
-                let apfloat = num.parse::<Single>().unwrap_or_else(|e| {
-                    panic!("apfloat::ieee::Single failed to parse `{}`: {:?}", num, e);
-                });
-                let apfloat_bits = apfloat.to_bits();
-                assert!(rust_bits == apfloat_bits,
-                    "apfloat::ieee::Single gave different result for `{}`: \
-                     {}({:#x}) vs Rust's {}({:#x})",
-                    num, apfloat, apfloat_bits,
-                    Single::from_bits(rust_bits), rust_bits);
-                apfloat_bits
-            }
-            ast::FloatTy::F64 => {
-                let rust_bits = num.parse::<f64>()?.to_bits() as u128;
-                let apfloat = num.parse::<Double>().unwrap_or_else(|e| {
-                    panic!("apfloat::ieee::Double failed to parse `{}`: {:?}", num, e);
-                });
-                let apfloat_bits = apfloat.to_bits();
-                assert!(rust_bits == apfloat_bits,
-                    "apfloat::ieee::Double gave different result for `{}`: \
-                     {}({:#x}) vs Rust's {}({:#x})",
-                    num, apfloat, apfloat_bits,
-                    Double::from_bits(rust_bits), rust_bits);
-                apfloat_bits
-            }
-        };
-        Ok(ConstFloat { bits, ty })
-    }
-
-    pub fn to_i128(self, width: usize) -> Option<i128> {
-        assert!(width <= 128);
-        let r = match self.ty {
-            ast::FloatTy::F32 => Single::from_bits(self.bits).to_i128(width),
-            ast::FloatTy::F64 => Double::from_bits(self.bits).to_i128(width)
-        };
-        if r.status.intersects(Status::INVALID_OP) {
-            None
-        } else {
-            Some(r.value)
-        }
-    }
-
-    pub fn to_u128(self, width: usize) -> Option<u128> {
-        assert!(width <= 128);
-        let r = match self.ty {
-            ast::FloatTy::F32 => Single::from_bits(self.bits).to_u128(width),
-            ast::FloatTy::F64 => Double::from_bits(self.bits).to_u128(width)
-        };
-        if r.status.intersects(Status::INVALID_OP) {
-            None
-        } else {
-            Some(r.value)
-        }
-    }
-
-    pub fn convert(self, to: ast::FloatTy) -> Self {
-        let bits = match (self.ty, to) {
-            (ast::FloatTy::F32, ast::FloatTy::F32) |
-            (ast::FloatTy::F64, ast::FloatTy::F64) => return self,
-
-            (ast::FloatTy::F32, ast::FloatTy::F64) => {
-                Double::to_bits(Single::from_bits(self.bits).convert(&mut false).value)
-            }
-            (ast::FloatTy::F64, ast::FloatTy::F32) => {
-                Single::to_bits(Double::from_bits(self.bits).convert(&mut false).value)
-            }
-        };
-        ConstFloat { bits, ty: to }
-    }
-}
-
-impl ::std::fmt::Display for ConstFloat {
-    fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> Result<(), ::std::fmt::Error> {
-        match self.ty {
-            ast::FloatTy::F32 => write!(fmt, "{:#}", Single::from_bits(self.bits))?,
-            ast::FloatTy::F64 => write!(fmt, "{:#}", Double::from_bits(self.bits))?,
-        }
-        write!(fmt, "{}", self.ty)
-    }
-}
-
-impl ::std::fmt::Debug for ConstFloat {
-    fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> Result<(), ::std::fmt::Error> {
-        ::std::fmt::Display::fmt(self, fmt)
-    }
-}
-
-macro_rules! derive_binop {
-    ($op:ident, $func:ident) => {
-        impl ::std::ops::$op for ConstFloat {
-            type Output = Option<Self>;
-            fn $func(self, rhs: Self) -> Option<Self> {
-                let bits = match (self.ty, rhs.ty) {
-                    (ast::FloatTy::F32, ast::FloatTy::F32) =>{
-                        let a = Single::from_bits(self.bits);
-                        let b = Single::from_bits(rhs.bits);
-                        a.$func(b).value.to_bits()
-                    }
-                    (ast::FloatTy::F64, ast::FloatTy::F64) => {
-                        let a = Double::from_bits(self.bits);
-                        let b = Double::from_bits(rhs.bits);
-                        a.$func(b).value.to_bits()
-                    }
-                    _ => return None,
-                };
-                Some(ConstFloat { bits, ty: self.ty })
-            }
-        }
-    }
-}
-
-derive_binop!(Add, add);
-derive_binop!(Sub, sub);
-derive_binop!(Mul, mul);
-derive_binop!(Div, div);
-derive_binop!(Rem, rem);
-
-impl ::std::ops::Neg for ConstFloat {
-    type Output = Self;
-    fn neg(self) -> Self {
-        let bits = match self.ty {
-            ast::FloatTy::F32 => (-Single::from_bits(self.bits)).to_bits(),
-            ast::FloatTy::F64 => (-Double::from_bits(self.bits)).to_bits(),
-        };
-        ConstFloat { bits, ty: self.ty }
-    }
-}
-
-/// This is `f32::MAX + (0.5 ULP)` as an integer. Numbers greater or equal to this
-/// are rounded to infinity when converted to `f32`.
-///
-/// NB: Computed as maximum significand with an extra 1 bit added (for the half ULP)
-/// shifted by the maximum exponent (accounting for normalization).
-pub const MAX_F32_PLUS_HALF_ULP: u128 = ((1 << (Single::PRECISION + 1)) - 1)
-                                        << (Single::MAX_EXP - Single::PRECISION as i16);
diff --git a/src/librustc_const_math/lib.rs b/src/librustc_const_math/lib.rs
index 499c330be1d..08996b892f9 100644
--- a/src/librustc_const_math/lib.rs
+++ b/src/librustc_const_math/lib.rs
@@ -18,14 +18,9 @@
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
 
-extern crate rustc_apfloat;
-
-extern crate syntax;
 
 extern crate serialize as rustc_serialize; // used by deriving
 
-mod float;
 mod err;
 
-pub use float::*;
 pub use err::{ConstMathErr, Op};