[clang] [llvm] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow AVX/AVX512 subvector extraction intrinsics to be used in constexpr #157712 (PR #158853)

[via llvm-commits]

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@@ -678,6 +678,30 @@ static bool interp__builtin_popcount(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool interp__builtin_parity(InterpState &S, CodePtr OpPC,
+                                   const InterpFrame *Frame,
+                                   const CallExpr *Call) {
+  APSInt Val = popToAPSInt(S, Call->getArg(0));
+  pushInteger(S, Val.popcount() % 2, Call->getType());
+  return true;
+}
+
+static bool interp__builtin_clrsb(InterpState &S, CodePtr OpPC,
+                                  const InterpFrame *Frame,
+                                  const CallExpr *Call) {
+  APSInt Val = popToAPSInt(S, Call->getArg(0));
+  pushInteger(S, Val.getBitWidth() - Val.getSignificantBits(), Call->getType());
+  return true;
+}
+
+static bool interp__builtin_bitreverse(InterpState &S, CodePtr OpPC,
+                                       const InterpFrame *Frame,
+                                       const CallExpr *Call) {
+  APSInt Val = popToAPSInt(S, Call->getArg(0));
+  pushInteger(S, Val.reverseBits(), Call->getType());
+  return true;
+}
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SeongjaeP wrote:

Ah, I see — that makes sense. I must have messed up the merge at some point.
I’m still getting used to the rebase workflow, so mistakes like this happen sometimes.
I’ll fix it and clean up the patch soon.

https://github.com/llvm/llvm-project/pull/158853