[llvm] [LangRef] Clarify that selects can have !unpredictable (PR #162753)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-ir

Author: Tim Creech (tcreech-intel)

<details>
<summary>Changes</summary>

Originally `!unpredictable` could only appear on branches and switches, but now it can also appear on selects. This change updates the LangRef accordingly.

---
Full diff: https://github.com/llvm/llvm-project/pull/162753.diff


1 Files Affected:

- (modified) llvm/docs/LangRef.rst (+6-6) 


``````````diff
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 8b6c25c58d61e..738743d04e6bb 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -7517,12 +7517,12 @@ sections that the user does not want removed after linking.
 '``unpredictable``' Metadata
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-``unpredictable`` metadata may be attached to any branch or switch
-instruction. It can be used to express the unpredictability of control
-flow. Similar to the ``llvm.expect`` intrinsic, it may be used to alter
-optimizations related to compare and branch instructions. The metadata
-is treated as a boolean value; if it exists, it signals that the branch
-or switch that it is attached to is completely unpredictable.
+``unpredictable`` metadata may be attached to any branch, select, or switch
+instruction. It can be used to express the unpredictability of control flow.
+Similar to the ``llvm.expect`` intrinsic, it may be used to alter optimizations
+related to compare and branch instructions. The metadata is treated as a
+boolean value; if it exists, it signals that the branch, select, or switch that
+it is attached to is completely unpredictable.
 
 .. _md_dereferenceable:
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/162753