[libc-commits] [libc] [libc][math] Temporarily disable nexttowardf16 on aarch64 due to clang-11 bug. (PR #94569)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: None (lntue)

<details>
<summary>Changes</summary>

The conversion between _Float16 and long double will crash clang-11 on aarch64. This is fixed in clang-12: https://godbolt.org/z/8ceT9454c

---
Full diff: https://github.com/llvm/llvm-project/pull/94569.diff


1 Files Affected:

- (modified) libc/config/linux/aarch64/entrypoints.txt (+4-1) 


``````````diff
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index a8cb468b3cba9..13a4445aca76b 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -516,7 +516,10 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.nearbyintf16
     libc.src.math.nextafterf16
     libc.src.math.nextdownf16
-    libc.src.math.nexttowardf16
+    # Temporarily disable nexttowardf16 on aarch64 because the conversion
+    # between _Float16 and long double will crash clang-11.  This is fixed in
+    # clang-12 and after: https://godbolt.org/z/8ceT9454c
+    # libc.src.math.nexttowardf16
     libc.src.math.nextupf16
     libc.src.math.rintf16
     libc.src.math.roundf16

``````````

</details>


https://github.com/llvm/llvm-project/pull/94569