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reduce a code repetition like (n << amt) >> amt

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This commit is contained in:
kenta7777 2019-02-24 12:55:14 +09:00
parent aadbc459bd
commit 423ae56943
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)
}