[clang] [clang][bytecode] Implement ia32_select* builtins (PR #154758)

[Shafik Yaghmour via cfe-commits]

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@@ -2778,6 +2778,40 @@ static bool interp__builtin_elementwise_fma(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+/// AVX512 predicated move: "Result = Mask[] ? LHS[] : RHS[]".
+static bool interp__builtin_select(InterpState &S, CodePtr OpPC,
+                                   const CallExpr *Call) {
+  const Pointer &RHS = S.Stk.pop<Pointer>();
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shafik wrote:

`assert(Call->getNumArgs() == 1);`?

https://github.com/llvm/llvm-project/pull/154758