CUDA layout corner cases/testing (#1881)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Add support for sizeOf/alignOf/offsetOf to stdlib.
Add $G intrinsic expansion that works of the generic parameters not the param type

* Test cuda layout.

* Fix CUDA layout issues.
Fix reflection to handle other built in types.
Fix __offsetOf

* Tests of reflection and layout as reported directly from CUDA.

* Comment about use of aligned size as size.

* Fix warning from VS.

* Check alignment is pow2.

* Small improvements to alignment calcs.

* Tab to spaces.

* Fix alignment pointer sizes on 32 bit OS for CUDA.

* Fix CUDA reflection on 32 bit.

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/cuda/cuda-layout.slang b/tests/cuda/cuda-layout.slang
new file mode 100644
index 000000000..725bf798e
--- /dev/null
+++ b/tests/cuda/cuda-layout.slang
@@ -0,0 +1,24 @@
+//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -output-using-type -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer : register(u0);
+
+#define WRITE_TYPE_ALIGN(base, type) \
+    outputBuffer[base * 4 + 0] = __alignOf<type>(); \
+    outputBuffer[base * 4 + 1] = __alignOf<vector<type, 2> >(); \
+    outputBuffer[base * 4 + 2] = __alignOf<vector<type, 3> >(); \
+    outputBuffer[base * 4 + 3] = __alignOf<vector<type, 4> >();
+    
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    WRITE_TYPE_ALIGN(0, uint8_t)
+    WRITE_TYPE_ALIGN(1, uint16_t)
+    WRITE_TYPE_ALIGN(2, int)
+    WRITE_TYPE_ALIGN(3, int64_t)
+    
+    WRITE_TYPE_ALIGN(4, half)
+    WRITE_TYPE_ALIGN(5, float)
+    WRITE_TYPE_ALIGN(6, double)   
+}