[libcxx-commits] [libcxx] [FIX] Fix the function isctype failed in arm64-big-endian (PR #73200)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxx

Author: None (W-50243)

<details>
<summary>Changes</summary>

 'isctype' failes in arm64-big-endian, this is because the __regex_word involved in the type mask operation is not changed based on big-endian or little-endian, while the character mask that participates in the budget changes accordingly.

---
Full diff: https://github.com/llvm/llvm-project/pull/73200.diff


1 Files Affected:

- (modified) libcxx/include/__locale (+1-1) 


``````````diff
diff --git a/libcxx/include/__locale b/libcxx/include/__locale
index b1502dd71edadf6..ef56135f2f1d45e 100644
--- a/libcxx/include/__locale
+++ b/libcxx/include/__locale
@@ -384,7 +384,7 @@ public:
     static const mask punct  = _ISpunct;
     static const mask xdigit = _ISxdigit;
     static const mask blank  = _ISblank;
-#if defined(__mips__)
+#if defined(__mips__) || (BYTE_ORDER == BIG_ENDIAN)
     static const mask __regex_word = static_cast<mask>(_ISbit(15));
 #else
     static const mask __regex_word = 0x80;

``````````

</details>


https://github.com/llvm/llvm-project/pull/73200