[libc-commits] [libc] Turn LIBC_COPT_STRING_UNSAFE_WIDE_READ on by default (PR #144163)

[via libc-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: Amy Huang (amykhuang)

<details>
<summary>Changes</summary>

Configure strlen to use unsafe implementation because it is faster.

Because this is undefined behavior it could cause sanitizers to fail.

---
Full diff: https://github.com/llvm/llvm-project/pull/144163.diff


1 Files Affected:

- (modified) libc/config/config.json (+1-1) 


``````````diff
diff --git a/libc/config/config.json b/libc/config/config.json
index d53b2936edb07..0354b16997cdd 100644
--- a/libc/config/config.json
+++ b/libc/config/config.json
@@ -59,7 +59,7 @@
   },
   "string": {
     "LIBC_CONF_STRING_UNSAFE_WIDE_READ": {
-      "value": false,
+      "value": true,
       "doc": "Read more than a byte at a time to perform byte-string operations like strlen."
     },
     "LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {

``````````

</details>


https://github.com/llvm/llvm-project/pull/144163