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, 28 insertions, 0 deletions

diff --git a/tests/cuda/cuda-reflection.slang b/tests/cuda/cuda-reflection.slang
new file mode 100644
index 000000000..95bf591c9
--- /dev/null
+++ b/tests/cuda/cuda-reflection.slang
@@ -0,0 +1,28 @@
+// cuda-reflection.slang
+
+//TEST:REFLECTION:-stage compute -entry main -target cuda
+
+struct PadLadenStruct
+{
+    double a;
+    uint8_t b;
+};
+
+// This is to check if the last half can be inserted 'inside' the spare padding of a. It should not be
+struct StructWithArray
+{
+    PadLadenStruct a[1];
+    uint8_t c;
+    
+    matrix<half, 3, 3> d;
+    uint8_t e;
+};
+
+ConstantBuffer<StructWithArray> cb;
+RWStructuredBuffer<StructWithArray> sb;
+
+[numthreads(1, 1, 1)]
+void main(
+    uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+}
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