[DirectX] Fix DXIL container generating invalid PSV0 part for unbounded resources (llvm#163287)

When calculating the upper bound for resource binding to be stored in the PSV0 part of the DXIL container, the compiler needs to take into account that the resource range could be _unbounded_, which is indicated by the binding size being `UINT32_MAX`.

Fixes [llvm#159679](llvm#159679)

Author: hekota

llvm/lib/Target/DirectX/DXContainerGlobals.cpp

@@ -28,6 +28,7 @@
 #include "llvm/Support/MD5.h"
 #include "llvm/TargetParser/Triple.h"
 #include "llvm/Transforms/Utils/ModuleUtils.h"
+#include <cstdint>
 #include <optional>
 
 using namespace llvm;
@@ -193,7 +194,12 @@ void DXContainerGlobals::addResourcesForPSV(Module &M, PSVRuntimeInfo &PSV) {
         dxbc::PSV::v2::ResourceBindInfo BindInfo;
         BindInfo.Type = Type;
         BindInfo.LowerBound = Binding.LowerBound;
-        BindInfo.UpperBound = Binding.LowerBound + Binding.Size - 1;
+        assert(Binding.Size == UINT32_MAX ||
+               (uint64_t)Binding.LowerBound + Binding.Size - 1 <= UINT32_MAX &&
+                   "Resource range is too large");
+        BindInfo.UpperBound = (Binding.Size == UINT32_MAX)
+                                  ? UINT32_MAX
+                                  : Binding.LowerBound + Binding.Size - 1;
         BindInfo.Space = Binding.Space;
         BindInfo.Kind = static_cast<dxbc::PSV::ResourceKind>(Kind);
         BindInfo.Flags = Flags;

llvm/test/CodeGen/DirectX/ContainerData/PSVResources.ll

@@ -94,6 +94,18 @@ define void @main() #0 {
   %uav2_2 = call target("dx.TypedBuffer", <4 x float>, 1, 0, 0)
               @llvm.dx.resource.handlefrombinding.tdx.TypedBuffer_f32_1_0(
                   i32 4, i32 0, i32 10, i32 5, ptr null)
+
+  ; RWBuffer<float4> UnboundedArray[] : register(u10, space5)
+; CHECK:        - Type:            UAVTyped
+; CHECK:          Space:           5
+; CHECK:          LowerBound:      10
+; CHECK:          UpperBound:      4294967295
+; CHECK:          Kind:            TypedBuffer
+; CHECK:          Flags:
+; CHECK:            UsedByAtomic64:  false
+  ; RWBuffer<float4> Buf = BufferArray[100];
+  %uav3 = call target("dx.TypedBuffer", <4 x float>, 1, 0, 0)
+              @llvm.dx.resource.handlefrombinding(i32 5, i32 10, i32 -1, i32 100, ptr null)
   ret void
 }