[llvm] [Hexagon] Handle Call Operand vxi1 in Hexagon without HVX Enabled (PR #136546)

[via llvm-commits]

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@@ -155,7 +155,84 @@ static bool CC_SkipOdd(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
 }
 
 #include "HexagonGenCallingConv.inc"
+unsigned HexagonTargetLowering::getVectorTypeBreakdownForCallingConv(
+    LLVMContext &Context, CallingConv::ID CC, EVT VT, EVT &IntermediateVT,
+    unsigned &NumIntermediates, MVT &RegisterVT) const {
+
+  RegisterVT = MVT::v8i8;
+  IntermediateVT = MVT::v8i1;
+  // Split vectors of type vXi1 into (X/8) vectors of type v8i1,
+  // where X is divisible by 8.
+  if (!Subtarget.useHVXOps()) {
+    switch (VT.getSimpleVT().SimpleTy) {
+    case MVT::v16i1:
+      NumIntermediates = 2;
+      return 2;
+    case MVT::v32i1:
+      NumIntermediates = 4;
+      return 4;
+    case MVT::v64i1:
+      NumIntermediates = 8;
+      return 8;
+    case MVT::v128i1:
+      NumIntermediates = 16;
+      return 16;
+    default:
+      break;
+    }
+  }
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aankit-ca wrote:

You can avoid the switch here and divide the element count by 8 here

https://github.com/llvm/llvm-project/pull/136546