[clang] [clang] [Sema] Check argument range for prefetchi* intrinsics (PR #149745)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Timothy Herchen (anematode)

<details>
<summary>Changes</summary>

Fixes https://github.com/llvm/llvm-project/issues/144857 . I can create a test if desired, but I think the fix is trivial enough.

<img width="805" height="105" alt="image" src="https://github.com/user-attachments/assets/aaee8e5f-6e65-4f04-b8b9-e4ae1434d958" />


---
Full diff: https://github.com/llvm/llvm-project/pull/149745.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaX86.cpp (+5) 


``````````diff
diff --git a/clang/lib/Sema/SemaX86.cpp b/clang/lib/Sema/SemaX86.cpp
index 5c149bdec7073..6bb3558972126 100644
--- a/clang/lib/Sema/SemaX86.cpp
+++ b/clang/lib/Sema/SemaX86.cpp
@@ -954,6 +954,11 @@ bool SemaX86::CheckBuiltinFunctionCall(const TargetInfo &TI, unsigned BuiltinID,
     l = 0;
     u = 15;
     break;
+  case X86::BI__builtin_ia32_prefetchi:
+    i = 1;
+    l = 2; // _MM_HINT_T1
+    u = 3; // _MM_HINT_T0
+    break;
   }
 
   // Note that we don't force a hard error on the range check here, allowing

``````````

</details>


https://github.com/llvm/llvm-project/pull/149745