[libclc] [libcxx] [libcxxabi] [llvm] [clang-tools-extra] [flang] [libc] [compiler-rt] [lldb] [lld] [clang] [VPlan] Add new VPScalarCastRecipe, use for IV & step trunc. (PR #78113)

[Florian Hahn via llvm-commits]

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@@ -1469,6 +1461,52 @@ void VPReplicateRecipe::print(raw_ostream &O, const Twine &Indent,
 }
 #endif
 
+static bool isUniformAcrossVFsAndUFs(VPScalarCastRecipe *C) {
+  return C->isDefinedOutsideVectorRegions() ||
+         isa<VPDerivedIVRecipe>(C->getOperand(0)) ||
+         isa<VPCanonicalIVPHIRecipe>(C->getOperand(0));
+}
+
+Value *VPScalarCastRecipe ::generate(VPTransformState &State, unsigned Part) {
+  assert(vputils::onlyFirstLaneUsed(this) &&
+         "Codegen only implemented for first lane.");
+  switch (Opcode) {
+  case Instruction::SExt:
+  case Instruction::ZExt:
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fhahn wrote:

Yep, could remove if preferred, but `State.Builder.CreateCast` generically supports any cast

https://github.com/llvm/llvm-project/pull/78113