fixup: Add comment and fix test function signature

Author: bogner

llvm/lib/Target/DirectX/DXILResourceAccess.cpp

@@ -29,11 +29,11 @@ static void replaceTypedBufferAccess(IntrinsicInst *II,
   assert(HandleType->getName() == "dx.TypedBuffer" &&
          "Unexpected typed buffer type");
   Type *ContainedType = HandleType->getTypeParameter(0);
+
+  // We need the size of an element in bytes so that we can calculate the offset
+  // in elements given a total offset in bytes later.
   Type *ScalarType = ContainedType->getScalarType();
   uint64_t ScalarSize = DL.getTypeSizeInBits(ScalarType) / 8;
-  int NumElements = ContainedType->getNumContainedTypes();
-  if (!NumElements)
-    NumElements = 1;
 
   // Process users keeping track of indexing accumulated from GEPs.
   struct AccessAndIndex {

llvm/test/CodeGen/DirectX/ResourceAccess/load_typedbuffer.ll

@@ -3,7 +3,7 @@
 target triple = "dxil-pc-shadermodel6.6-compute"
 
 declare void @use_float4(<4 x float>)
-declare void @use_float(<4 x float>)
+declare void @use_float(float)
 
 ; CHECK-LABEL: define void @load_float4
 define void @load_float4(i32 %index, i32 %elemindex) {