diff --git a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
--- a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
@@ -969,7 +969,7 @@
 }
 
 unsigned RISCVTTIImpl::getRegUsageForType(Type *Ty) {
-  TypeSize Size = Ty->getPrimitiveSizeInBits();
+  TypeSize Size = DL.getTypeSizeInBits(Ty);
   if (Ty->isVectorTy()) {
     if (Size.isScalable() && ST->hasVInstructions())
       return divideCeil(Size.getKnownMinValue(), RISCV::RVVBitsPerBlock);