[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - allow SSE41 phminposuw intrinsic to be used in constexp (PR #163041)

Shawn K via cfe-commits cfe-commits at lists.llvm.org
Tue Oct 14 10:53:39 PDT 2025


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@@ -2899,6 +2899,45 @@ static bool interp__builtin_x86_insert_subvector(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool interp__builtin_ia32_phminposuw(InterpState &S, CodePtr OpPC,
+                                            const CallExpr *Call) {
+  assert(Call->getNumArgs() == 1);
+
+  const Pointer &Source = S.Stk.pop<Pointer>();
+  const Pointer &Dest = S.Stk.peek<Pointer>();
+
+  unsigned SourceLen = Source.getNumElems();
+  QualType ElemQT = getElemType(Source);
+  OptPrimType ElemT = S.getContext().classify(ElemQT);
+  unsigned LaneBitWidth = S.getASTContext().getTypeSize(ElemQT);
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kimsh02 wrote:

Okay, I misunderstood "lane" then 

https://github.com/llvm/llvm-project/pull/163041


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