From 46f1cc69db895704100197d43ce853bb29674f11 Mon Sep 17 00:00:00 2001
From: kenta7777 <k.hasegw7@gmail.com>
Date: Sun, 24 Feb 2019 08:57:24 +0900
Subject: [PATCH] reduce miri code repetition like (n << amt) >> amt

---
 src/librustc_mir/hair/constant.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/librustc_mir/hair/constant.rs b/src/librustc_mir/hair/constant.rs
index 21c471d49ee66..caadc6055b5c6 100644
--- a/src/librustc_mir/hair/constant.rs
+++ b/src/librustc_mir/hair/constant.rs
@@ -21,8 +21,7 @@ crate fn lit_to_const<'a, 'gcx, 'tcx>(
         let param_ty = ParamEnv::reveal_all().and(tcx.lift_to_global(&ty).unwrap());
         let width = tcx.layout_of(param_ty).map_err(|_| LitToConstError::Reported)?.size;
         trace!("trunc {} with size {} and shift {}", n, width.bits(), 128 - width.bits());
-        let shift = 128 - width.bits();
-        let result = (n << shift) >> shift;
+        let result = truncate(n, width);
         trace!("trunc result: {}", result);
         Ok(ConstValue::Scalar(Scalar::Bits {
             bits: result,