From: Justin Ridgewell <justin@ridgewell.name>
Date: Fri, 5 Jul 2019 20:39:56 +0000 (-0400)
Subject: Do not use pointer alignment on unsupported platforms
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=3b6e8ed502e351d5d8daa3ac0c61a4e44b428d98;hp=3d2c4ff45689df3c5a9196809a2b97315711d1fb;p=rust.git

Do not use pointer alignment on unsupported platforms
---

diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs
index 277dc6ff4a8..95756c27117 100644
--- a/src/libcore/str/mod.rs
+++ b/src/libcore/str/mod.rs
@@ -1497,7 +1497,7 @@ macro_rules! next { () => {{
             // Ascii case, try to skip forward quickly.
             // When the pointer is aligned, read 2 words of data per iteration
             // until we find a word containing a non-ascii byte.
-            if align.wrapping_sub(index) % usize_bytes == 0 {
+            if align != usize::max_value() && align.wrapping_sub(index) % usize_bytes == 0 {
                 let ptr = v.as_ptr();
                 while index < blocks_end {
                     unsafe {