[clang] [NFC][clang] Replace unchecked dyn_cast with cast (PR #98948)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Mike Rice (mikerice1969)

<details>
<summary>Changes</summary>

BI__builtin_hlsl_elementwise_rcp is only invoked with a FixedVectorType so use cast to make this clear and satisfy the static verifier.

---
Full diff: https://github.com/llvm/llvm-project/pull/98948.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CGBuiltin.cpp (+6-7) 


``````````diff
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index a54fa7bf87aad..c0297476391d2 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -18389,13 +18389,12 @@ Value *CodeGenFunction::EmitHLSLBuiltinExpr(unsigned BuiltinID,
       llvm_unreachable("rcp operand must have a float representation");
     llvm::Type *Ty = Op0->getType();
     llvm::Type *EltTy = Ty->getScalarType();
-    Constant *One =
-        Ty->isVectorTy()
-            ? ConstantVector::getSplat(
-                  ElementCount::getFixed(
-                      dyn_cast<FixedVectorType>(Ty)->getNumElements()),
-                  ConstantFP::get(EltTy, 1.0))
-            : ConstantFP::get(EltTy, 1.0);
+    Constant *One = Ty->isVectorTy()
+                        ? ConstantVector::getSplat(
+                              ElementCount::getFixed(
+                                  cast<FixedVectorType>(Ty)->getNumElements()),
+                              ConstantFP::get(EltTy, 1.0))
+                        : ConstantFP::get(EltTy, 1.0);
     return Builder.CreateFDiv(One, Op0, "hlsl.rcp");
   }
   case Builtin::BI__builtin_hlsl_elementwise_rsqrt: {

``````````

</details>


https://github.com/llvm/llvm-project/pull/98948