diff --git a/dlls/d3d11/tests/d3d11.c b/dlls/d3d11/tests/d3d11.c
index 453fb524bef..4ac2a70d302 100644
--- a/dlls/d3d11/tests/d3d11.c
+++ b/dlls/d3d11/tests/d3d11.c
@@ -33,12 +33,72 @@ static const D3D_FEATURE_LEVEL d3d11_feature_levels[] =
     D3D_FEATURE_LEVEL_9_1
 };
 
+struct vec2
+{
+    float x, y;
+};
+
+struct vec4
+{
+    float x, y, z, w;
+};
+
 static ULONG get_refcount(IUnknown *iface)
 {
     IUnknown_AddRef(iface);
     return IUnknown_Release(iface);
 }
 
+static BOOL compare_color(DWORD c1, DWORD c2, BYTE max_diff)
+{
+    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
+        return FALSE;
+    c1 >>= 8; c2 >>= 8;
+    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
+        return FALSE;
+    c1 >>= 8; c2 >>= 8;
+    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
+        return FALSE;
+    c1 >>= 8; c2 >>= 8;
+    if (abs((c1 & 0xff) - (c2 & 0xff)) > max_diff)
+        return FALSE;
+    return TRUE;
+}
+
+static DWORD get_texture_color(ID3D11Texture2D *src_texture, unsigned int x, unsigned int y)
+{
+    D3D11_MAPPED_SUBRESOURCE mapped_texture;
+    D3D11_TEXTURE2D_DESC texture_desc;
+    ID3D11Texture2D *dst_texture;
+    ID3D11DeviceContext *context;
+    ID3D11Device *device;
+    DWORD color;
+    HRESULT hr;
+
+    ID3D11Texture2D_GetDevice(src_texture, &device);
+    ID3D11Device_GetImmediateContext(device, &context);
+
+    ID3D11Texture2D_GetDesc(src_texture, &texture_desc);
+    texture_desc.Usage = D3D11_USAGE_STAGING;
+    texture_desc.BindFlags = 0;
+    texture_desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+    texture_desc.MiscFlags = 0;
+    hr = ID3D11Device_CreateTexture2D(device, &texture_desc, NULL, &dst_texture);
+    ok(SUCCEEDED(hr), "Failed to create texture, hr %#x.\n", hr);
+
+    ID3D11DeviceContext_CopyResource(context, (ID3D11Resource *)dst_texture, (ID3D11Resource *)src_texture);
+    hr = ID3D11DeviceContext_Map(context, (ID3D11Resource *)dst_texture, 0, D3D11_MAP_READ, 0, &mapped_texture);
+    ok(SUCCEEDED(hr), "Failed to map texture, hr %#x.\n", hr);
+    color = *(DWORD *)(((BYTE *)mapped_texture.pData) + mapped_texture.RowPitch * y + x * 4);
+    ID3D11DeviceContext_Unmap(context, (ID3D11Resource *)dst_texture, 0);
+
+    ID3D11Texture2D_Release(dst_texture);
+    ID3D11DeviceContext_Release(context);
+    ID3D11Device_Release(device);
+
+    return color;
+}
+
 static ID3D11Device *create_device(const D3D_FEATURE_LEVEL *feature_level)
 {
     ID3D11Device *device;
@@ -57,6 +117,47 @@ static ID3D11Device *create_device(const D3D_FEATURE_LEVEL *feature_level)
     return NULL;
 }
 
+static IDXGISwapChain *create_swapchain(ID3D11Device *device, HWND window, BOOL windowed)
+{
+    IDXGISwapChain *swapchain;
+    DXGI_SWAP_CHAIN_DESC desc;
+    IDXGIDevice *dxgi_device;
+    IDXGIAdapter *adapter;
+    IDXGIFactory *factory;
+    HRESULT hr;
+
+    hr = ID3D11Device_QueryInterface(device, &IID_IDXGIDevice, (void **)&dxgi_device);
+    ok(SUCCEEDED(hr), "Failed to get DXGI device, hr %#x.\n", hr);
+    hr = IDXGIDevice_GetAdapter(dxgi_device, &adapter);
+    ok(SUCCEEDED(hr), "Failed to get adapter, hr %#x.\n", hr);
+    IDXGIDevice_Release(dxgi_device);
+    hr = IDXGIAdapter_GetParent(adapter, &IID_IDXGIFactory, (void **)&factory);
+    ok(SUCCEEDED(hr), "Failed to get factory, hr %#x.\n", hr);
+    IDXGIAdapter_Release(adapter);
+
+    desc.BufferDesc.Width = 640;
+    desc.BufferDesc.Height = 480;
+    desc.BufferDesc.RefreshRate.Numerator = 60;
+    desc.BufferDesc.RefreshRate.Denominator = 1;
+    desc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+    desc.BufferDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;
+    desc.BufferDesc.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;
+    desc.SampleDesc.Count = 1;
+    desc.SampleDesc.Quality = 0;
+    desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+    desc.BufferCount = 1;
+    desc.OutputWindow = window;
+    desc.Windowed = windowed;
+    desc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
+    desc.Flags = 0;
+
+    hr = IDXGIFactory_CreateSwapChain(factory, (IUnknown *)device, &desc, &swapchain);
+    ok(SUCCEEDED(hr), "Failed to create swapchain, hr %#x.\n", hr);
+    IDXGIFactory_Release(factory);
+
+    return swapchain;
+}
+
 static void test_create_device(void)
 {
     D3D_FEATURE_LEVEL feature_level, supported_feature_level;
@@ -2443,6 +2544,247 @@ static void test_private_data(void)
     ok(!refcount, "Test object has %u references left.\n", refcount);
 }
 
+static void test_il_append_aligned(void)
+{
+    ID3D11RenderTargetView *backbuffer_rtv;
+    D3D11_SUBRESOURCE_DATA resource_data;
+    ID3D11InputLayout *input_layout;
+    D3D11_BUFFER_DESC buffer_desc;
+    ID3D11DeviceContext *context;
+    ID3D11Texture2D *backbuffer;
+    unsigned int stride, offset;
+    IDXGISwapChain *swapchain;
+    ID3D11VertexShader *vs;
+    ID3D11PixelShader *ps;
+    ID3D11Device *device;
+    ID3D11Buffer *vb[3];
+    D3D11_VIEWPORT vp;
+    ULONG refcount;
+    DWORD color;
+    HWND window;
+    HRESULT hr;
+
+    static const D3D11_INPUT_ELEMENT_DESC layout_desc[] =
+    {
+        {"COLOR",    2, DXGI_FORMAT_R32G32_FLOAT,       1, D3D11_APPEND_ALIGNED_ELEMENT,
+                D3D11_INPUT_PER_INSTANCE_DATA, 2},
+        {"COLOR",    3, DXGI_FORMAT_R32G32_FLOAT,       2, D3D11_APPEND_ALIGNED_ELEMENT,
+                D3D11_INPUT_PER_INSTANCE_DATA, 1},
+        {"POSITION", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT,
+                D3D11_INPUT_PER_VERTEX_DATA, 0},
+        {"COLOR",    0, DXGI_FORMAT_R32G32_FLOAT,       2, D3D11_APPEND_ALIGNED_ELEMENT,
+                D3D11_INPUT_PER_INSTANCE_DATA, 1},
+        {"COLOR",    1, DXGI_FORMAT_R32G32_FLOAT,       1, D3D11_APPEND_ALIGNED_ELEMENT,
+                D3D11_INPUT_PER_INSTANCE_DATA, 2},
+    };
+    static const DWORD vs_code[] =
+    {
+#if 0
+        struct vs_in
+        {
+            float4 position : POSITION;
+            float2 color_xy : COLOR0;
+            float2 color_zw : COLOR1;
+            unsigned int instance_id : SV_INSTANCEID;
+        };
+
+        struct vs_out
+        {
+            float4 position : SV_POSITION;
+            float2 color_xy : COLOR0;
+            float2 color_zw : COLOR1;
+        };
+
+        struct vs_out main(struct vs_in i)
+        {
+            struct vs_out o;
+
+            o.position = i.position;
+            o.position.x += i.instance_id * 0.5;
+            o.color_xy = i.color_xy;
+            o.color_zw = i.color_zw;
+
+            return o;
+        }
+#endif
+        0x43425844, 0x52e3bf46, 0x6300403d, 0x624cffe4, 0xa4fc0013, 0x00000001, 0x00000214, 0x00000003,
+        0x0000002c, 0x000000bc, 0x00000128, 0x4e475349, 0x00000088, 0x00000004, 0x00000008, 0x00000068,
+        0x00000000, 0x00000000, 0x00000003, 0x00000000, 0x00000f0f, 0x00000071, 0x00000000, 0x00000000,
+        0x00000003, 0x00000001, 0x00000303, 0x00000071, 0x00000001, 0x00000000, 0x00000003, 0x00000002,
+        0x00000303, 0x00000077, 0x00000000, 0x00000008, 0x00000001, 0x00000003, 0x00000101, 0x49534f50,
+        0x4e4f4954, 0x4c4f4300, 0x5300524f, 0x4e495f56, 0x4e415453, 0x44494543, 0xababab00, 0x4e47534f,
+        0x00000064, 0x00000003, 0x00000008, 0x00000050, 0x00000000, 0x00000001, 0x00000003, 0x00000000,
+        0x0000000f, 0x0000005c, 0x00000000, 0x00000000, 0x00000003, 0x00000001, 0x00000c03, 0x0000005c,
+        0x00000001, 0x00000000, 0x00000003, 0x00000001, 0x0000030c, 0x505f5653, 0x5449534f, 0x004e4f49,
+        0x4f4c4f43, 0xabab0052, 0x52444853, 0x000000e4, 0x00010040, 0x00000039, 0x0300005f, 0x001010f2,
+        0x00000000, 0x0300005f, 0x00101032, 0x00000001, 0x0300005f, 0x00101032, 0x00000002, 0x04000060,
+        0x00101012, 0x00000003, 0x00000008, 0x04000067, 0x001020f2, 0x00000000, 0x00000001, 0x03000065,
+        0x00102032, 0x00000001, 0x03000065, 0x001020c2, 0x00000001, 0x02000068, 0x00000001, 0x05000056,
+        0x00100012, 0x00000000, 0x0010100a, 0x00000003, 0x09000032, 0x00102012, 0x00000000, 0x0010000a,
+        0x00000000, 0x00004001, 0x3f000000, 0x0010100a, 0x00000000, 0x05000036, 0x001020e2, 0x00000000,
+        0x00101e56, 0x00000000, 0x05000036, 0x00102032, 0x00000001, 0x00101046, 0x00000001, 0x05000036,
+        0x001020c2, 0x00000001, 0x00101406, 0x00000002, 0x0100003e,
+    };
+    static const DWORD ps_code[] =
+    {
+#if 0
+        struct vs_out
+        {
+            float4 position : SV_POSITION;
+            float2 color_xy : COLOR0;
+            float2 color_zw : COLOR1;
+        };
+
+        float4 main(struct vs_out i) : SV_TARGET
+        {
+            return float4(i.color_xy.xy, i.color_zw.xy);
+        }
+#endif
+        0x43425844, 0x64e48a09, 0xaa484d46, 0xe40a6e78, 0x9885edf3, 0x00000001, 0x00000118, 0x00000003,
+        0x0000002c, 0x00000098, 0x000000cc, 0x4e475349, 0x00000064, 0x00000003, 0x00000008, 0x00000050,
+        0x00000000, 0x00000001, 0x00000003, 0x00000000, 0x0000000f, 0x0000005c, 0x00000000, 0x00000000,
+        0x00000003, 0x00000001, 0x00000303, 0x0000005c, 0x00000001, 0x00000000, 0x00000003, 0x00000001,
+        0x00000c0c, 0x505f5653, 0x5449534f, 0x004e4f49, 0x4f4c4f43, 0xabab0052, 0x4e47534f, 0x0000002c,
+        0x00000001, 0x00000008, 0x00000020, 0x00000000, 0x00000000, 0x00000003, 0x00000000, 0x0000000f,
+        0x545f5653, 0x45475241, 0xabab0054, 0x52444853, 0x00000044, 0x00000040, 0x00000011, 0x03001062,
+        0x00101032, 0x00000001, 0x03001062, 0x001010c2, 0x00000001, 0x03000065, 0x001020f2, 0x00000000,
+        0x05000036, 0x001020f2, 0x00000000, 0x00101e46, 0x00000001, 0x0100003e,
+    };
+    static const struct
+    {
+        struct vec4 position;
+    }
+    stream0[] =
+    {
+        {{-1.0f, -1.0f, 0.0f, 1.0f}},
+        {{-1.0f,  1.0f, 0.0f, 1.0f}},
+        {{-0.5f, -1.0f, 0.0f, 1.0f}},
+        {{-0.5f,  1.0f, 0.0f, 1.0f}},
+    };
+    static const struct
+    {
+        struct vec2 color2;
+        struct vec2 color1;
+    }
+    stream1[] =
+    {
+        {{0.5f, 0.5f}, {0.0f, 1.0f}},
+        {{0.5f, 0.5f}, {1.0f, 1.0f}},
+    };
+    static const struct
+    {
+        struct vec2 color3;
+        struct vec2 color0;
+    }
+    stream2[] =
+    {
+        {{0.5f, 0.5f}, {1.0f, 0.0f}},
+        {{0.5f, 0.5f}, {0.0f, 1.0f}},
+        {{0.5f, 0.5f}, {0.0f, 0.0f}},
+        {{0.5f, 0.5f}, {1.0f, 0.0f}},
+    };
+    static const float red[] = {1.0f, 0.0f, 0.0f, 0.5f};
+
+    if (!(device = create_device(NULL)))
+    {
+        skip("Failed to create device.\n");
+        return;
+    }
+    window = CreateWindowA("static", "d3d11_test", WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+            0, 0, 640, 480, NULL, NULL, NULL, NULL);
+    swapchain = create_swapchain(device, window, TRUE);
+    hr = IDXGISwapChain_GetBuffer(swapchain, 0, &IID_ID3D11Texture2D, (void **)&backbuffer);
+    ok(SUCCEEDED(hr), "Failed to get buffer, hr %#x.\n", hr);
+
+    hr = ID3D11Device_CreateInputLayout(device, layout_desc, sizeof(layout_desc) / sizeof(*layout_desc),
+            vs_code, sizeof(vs_code), &input_layout);
+    ok(SUCCEEDED(hr), "Failed to create input layout, hr %#x.\n", hr);
+
+    buffer_desc.ByteWidth = sizeof(stream0);
+    buffer_desc.Usage = D3D11_USAGE_DEFAULT;
+    buffer_desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+    buffer_desc.CPUAccessFlags = 0;
+    buffer_desc.MiscFlags = 0;
+    buffer_desc.StructureByteStride = 0;
+
+    resource_data.pSysMem = stream0;
+    resource_data.SysMemPitch = 0;
+    resource_data.SysMemSlicePitch = 0;
+
+    hr = ID3D11Device_CreateBuffer(device, &buffer_desc, &resource_data, &vb[0]);
+    ok(SUCCEEDED(hr), "Failed to create vertex buffer, hr %#x.\n", hr);
+
+    buffer_desc.ByteWidth = sizeof(stream1);
+    resource_data.pSysMem = stream1;
+
+    hr = ID3D11Device_CreateBuffer(device, &buffer_desc, &resource_data, &vb[1]);
+    ok(SUCCEEDED(hr), "Failed to create vertex buffer, hr %#x.\n", hr);
+
+    buffer_desc.ByteWidth = sizeof(stream2);
+    resource_data.pSysMem = stream2;
+
+    hr = ID3D11Device_CreateBuffer(device, &buffer_desc, &resource_data, &vb[2]);
+    ok(SUCCEEDED(hr), "Failed to create vertex buffer, hr %#x.\n", hr);
+
+    hr = ID3D11Device_CreateVertexShader(device, vs_code, sizeof(vs_code), NULL, &vs);
+    ok(SUCCEEDED(hr), "Failed to create vertex shader, hr %#x.\n", hr);
+    hr = ID3D11Device_CreatePixelShader(device, ps_code, sizeof(ps_code), NULL, &ps);
+    ok(SUCCEEDED(hr), "Failed to create pixel shader, hr %#x.\n", hr);
+
+    hr = ID3D11Device_CreateRenderTargetView(device, (ID3D11Resource *)backbuffer, NULL, &backbuffer_rtv);
+    ok(SUCCEEDED(hr), "Failed to create rendertarget view, hr %#x.\n", hr);
+
+    ID3D11Device_GetImmediateContext(device, &context);
+
+    ID3D11DeviceContext_OMSetRenderTargets(context, 1, &backbuffer_rtv, NULL);
+    ID3D11DeviceContext_IASetInputLayout(context, input_layout);
+    ID3D11DeviceContext_IASetPrimitiveTopology(context, D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
+    offset = 0;
+    stride = sizeof(*stream0);
+    ID3D11DeviceContext_IASetVertexBuffers(context, 0, 1, &vb[0], &stride, &offset);
+    stride = sizeof(*stream1);
+    ID3D11DeviceContext_IASetVertexBuffers(context, 1, 1, &vb[1], &stride, &offset);
+    stride = sizeof(*stream2);
+    ID3D11DeviceContext_IASetVertexBuffers(context, 2, 1, &vb[2], &stride, &offset);
+    ID3D11DeviceContext_VSSetShader(context, vs, NULL, 0);
+    ID3D11DeviceContext_PSSetShader(context, ps, NULL, 0);
+
+    vp.TopLeftX = 0.0f;
+    vp.TopLeftY = 0.0f;
+    vp.Width = 640.0f;
+    vp.Height = 480.0f;
+    vp.MinDepth = 0.0f;
+    vp.MaxDepth = 1.0f;
+    ID3D11DeviceContext_RSSetViewports(context, 1, &vp);
+
+    ID3D11DeviceContext_ClearRenderTargetView(context, backbuffer_rtv, red);
+
+    ID3D11DeviceContext_DrawInstanced(context, 4, 4, 0, 0);
+
+    color = get_texture_color(backbuffer,  80, 240);
+    ok(compare_color(color, 0xff0000ff, 1), "Got unexpected color 0x%08x.\n", color);
+    color = get_texture_color(backbuffer, 240, 240);
+    ok(compare_color(color, 0xff00ff00, 1), "Got unexpected color 0x%08x.\n", color);
+    color = get_texture_color(backbuffer, 400, 240);
+    ok(compare_color(color, 0xffff0000, 1), "Got unexpected color 0x%08x.\n", color);
+    color = get_texture_color(backbuffer, 560, 240);
+    ok(compare_color(color, 0xffff00ff, 1), "Got unexpected color 0x%08x.\n", color);
+
+    ID3D11PixelShader_Release(ps);
+    ID3D11VertexShader_Release(vs);
+    ID3D11Buffer_Release(vb[2]);
+    ID3D11Buffer_Release(vb[1]);
+    ID3D11Buffer_Release(vb[0]);
+    ID3D11InputLayout_Release(input_layout);
+    ID3D11RenderTargetView_Release(backbuffer_rtv);
+    ID3D11Texture2D_Release(backbuffer);
+    IDXGISwapChain_Release(swapchain);
+    ID3D11DeviceContext_Release(context);
+    refcount = ID3D11Device_Release(device);
+    ok(!refcount, "Device has %u references left.\n", refcount);
+    DestroyWindow(window);
+}
+
 static void test_resource_map(void)
 {
     D3D11_MAPPED_SUBRESOURCE mapped_subresource;
@@ -2607,5 +2949,6 @@ START_TEST(d3d11)
     test_create_predicate();
     test_device_removed_reason();
     test_private_data();
+    test_il_append_aligned();
     test_resource_map();
 }