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Rollup merge of #58690 - kenta7777:reduce-code-repetition-miri-related, r=oli-obk

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Reduce a Code Repetition like `(n << amt) >> amt`

Fixes a part of [#49937](https://github.com/rust-lang/rust/issues/49937).
This commit is contained in:
Mazdak Farrokhzad 2019-02-25 11:42:22 +01:00 committed by GitHub
commit 53f15f24a8
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1 changed files with 2 additions and 3 deletions
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5
src/librustc/ty/sty.rs
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@ -3,7 +3,7 @@
use crate::hir;
use crate::hir::def_id::DefId;
use crate::infer::canonical::Canonical;
use crate::mir::interpret::ConstValue;
use crate::mir::interpret::{ConstValue, truncate};
use crate::middle::region;
use polonius_engine::Atom;
use rustc_data_structures::indexed_vec::Idx;
@ -2118,8 +2118,7 @@ impl<'tcx> Const<'tcx> {
let size = tcx.layout_of(ty).unwrap_or_else(|e| {
panic!("could not compute layout for {:?}: {:?}", ty, e)
}).size;
let shift = 128 - size.bits();
let truncated = (bits << shift) >> shift;
let truncated = truncate(bits, size);
assert_eq!(truncated, bits, "from_bits called with untruncated value");
Self::from_scalar(Scalar::Bits { bits, size: size.bytes() as u8 }, ty.value)
}