From 578fcdef5fbd02bd3ae7d30349f62aa9143a0bf2 Mon Sep 17 00:00:00 2001
From: bjorn3 <bjorn3@users.noreply.github.com>
Date: Mon, 15 Mar 2021 10:22:21 +0100
Subject: [PATCH] Special case ZST's in Rvalue::Repeat

Fixes #1146 by preventing a hang for [(); usize::MAX], which is used in
a test of libcore.
---
 src/base.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/base.rs b/src/base.rs
index 362ba7e1c2c..5a28656add2 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -660,7 +660,9 @@ fn codegen_stmt<'tcx>(
                         .val
                         .try_to_bits(fx.tcx.data_layout.pointer_size)
                         .unwrap();
-                    if fx.clif_type(operand.layout().ty) == Some(types::I8) {
+                    if operand.layout().size.bytes() == 0 {
+                        // Do nothing for ZST's
+                    } else if fx.clif_type(operand.layout().ty) == Some(types::I8) {
                         let times = fx.bcx.ins().iconst(fx.pointer_type, times as i64);
                         // FIXME use emit_small_memset where possible
                         let addr = lval.to_ptr().get_addr(fx);