Avoid iadd for ptr const val with zero offset

2020-10-12 12:03:18 +02:00 · 2020-10-12 12:03:18 +02:00 · 2f2d3b2fd4
commit 2f2d3b2fd4
parent cd2fc77b0e
1 changed files with 7 additions and 4 deletions
--- a/src/constant.rs
+++ b/src/constant.rs
@ -225,10 +225,13 @@ pub(crate) fn trans_const_value<'tcx>(
                        }
                        None => bug!("missing allocation {:?}", ptr.alloc_id),
                    };
-                    let val = fx
-                        .bcx
+                    let val = if ptr.offset.bytes() != 0 {
+                        fx.bcx
                            .ins()
-                        .iadd_imm(base_addr, i64::try_from(ptr.offset.bytes()).unwrap());
+                            .iadd_imm(base_addr, i64::try_from(ptr.offset.bytes()).unwrap())
+                    } else {
+                        base_addr
+                    };
                    return CValue::by_val(val, layout);
                }
            }