b0e55a83a8
This commit introduces 128-bit integers. Stage 2 builds and produces a working compiler which understands and supports 128-bit integers throughout. The general strategy used is to have rustc_i128 module which provides aliases for iu128, equal to iu64 in stage9 and iu128 later. Since nowhere in rustc we rely on large numbers being supported, this strategy is good enough to get past the first bootstrap stages to end up with a fully working 128-bit capable compiler. In order for this strategy to work, number of locations had to be changed to use associated max_value/min_value instead of MAX/MIN constants as well as the min_value (or was it max_value?) had to be changed to use xor instead of shift so both 64-bit and 128-bit based consteval works (former not necessarily producing the right results in stage1). This commit includes manual merge conflict resolution changes from a rebase by @est31.
54 lines
2.0 KiB
Rust
54 lines
2.0 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use syntax::ast;
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use super::err::*;
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use rustc_i128::u128;
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/// Depending on the target only one variant is ever used in a compilation.
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/// Anything else is an error. This invariant is checked at several locations
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#[derive(Copy, Clone, Debug, RustcEncodable, RustcDecodable, Hash, Eq, PartialEq)]
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pub enum ConstUsize {
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Us16(u16),
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Us32(u32),
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Us64(u64),
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}
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pub use self::ConstUsize::*;
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impl ConstUsize {
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pub fn as_u64(self, target_uint_ty: ast::UintTy) -> u64 {
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match (self, target_uint_ty) {
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(Us16(i), ast::UintTy::U16) => i as u64,
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(Us32(i), ast::UintTy::U32) => i as u64,
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(Us64(i), ast::UintTy::U64) => i,
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_ => panic!("unable to convert self ({:?}) to target usize ({:?})",
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self, target_uint_ty),
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}
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}
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pub fn new(i: u64, target_uint_ty: ast::UintTy) -> Result<Self, ConstMathErr> {
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match target_uint_ty {
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ast::UintTy::U16 if i as u16 as u64 == i => Ok(Us16(i as u16)),
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ast::UintTy::U16 => Err(ULitOutOfRange(ast::UintTy::Us)),
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ast::UintTy::U32 if i as u32 as u64 == i => Ok(Us32(i as u32)),
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ast::UintTy::U32 => Err(ULitOutOfRange(ast::UintTy::Us)),
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ast::UintTy::U64 => Ok(Us64(i)),
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_ => unreachable!(),
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}
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}
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pub fn new_truncating(i: u128, target_uint_ty: ast::UintTy) -> Self {
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match target_uint_ty {
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ast::UintTy::U16 => Us16(i as u16),
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ast::UintTy::U32 => Us32(i as u32),
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ast::UintTy::U64 => Us64(i as u64),
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_ => unreachable!(),
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}
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}
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}
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