[llvm-branch-commits] [clang] [clang][bytecode][HLSL][Matrix] Support `ConstantMatrixType` and more HLSL casts in the new constant interpreter for basic matrix constexpr evaluation in HLSL (PR #183424)

[Timm Baeder via llvm-branch-commits]

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@@ -2129,6 +2328,25 @@ bool Compiler<Emitter>::visitInitList(ArrayRef<const Expr *> Inits,
     return true;
   }
 
+  if (const auto *MT = QT->getAs<ConstantMatrixType>()) {
+    unsigned NumElems = MT->getNumElementsFlattened();
+    assert(Inits.size() == NumElems);
+
+    QualType ElemQT = MT->getElementType();
+    PrimType ElemT = classifyPrim(ElemQT);
+
+    // InitListExpr elements are in column-major order.
+    // Store in row-major order to match APValue convention.
+    for (unsigned I = 0; I != NumElems; ++I) {
+      if (!this->visit(Inits[I]))
+        return false;
+      if (!this->emitInitElem(ElemT,
+                              MT->mapColumnMajorToRowMajorFlattenedIndex(I), E))
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tbaederr wrote:

Just wondering, where is `mapColumnMajorToRowMajorFlattenedIndex()` defined? I don't seem to have it locally.

https://github.com/llvm/llvm-project/pull/183424