================
@@ -3412,6 +3412,13 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, 
const CallExpr *Call,
   case Builtin::BI__builtin_elementwise_fma:
     return interp__builtin_elementwise_fma(S, OpPC, Call);
 
+  case clang::X86::BI__builtin_ia32_pblendvb128:
+  case clang::X86::BI__builtin_ia32_pblendvb256:
+    return interp__builtin_elementwise_triop(
+        S, OpPC, Call, [](const APSInt &F, const APSInt &T, const APSInt &C) {
+          return ((APInt)C).isNegative() ? T : F;
----------------
shafik wrote:

So was returning by copy intended? Can you please confirm or if this is a bug 
please put in a fix?

https://github.com/llvm/llvm-project/pull/157100
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