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, 32 insertions, 0 deletions

diff --git a/tests/cuda/cuda-array-layout.slang b/tests/cuda/cuda-array-layout.slang
new file mode 100644
index 000000000..7fee3b192
--- /dev/null
+++ b/tests/cuda/cuda-array-layout.slang
@@ -0,0 +1,32 @@
+//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -output-using-type -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer : register(u0);
+
+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 b;
+    
+    matrix<half, 3, 3> c;
+    uint8_t d;
+};
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    StructWithArray s;
+    outputBuffer[0] = __sizeOf(s);
+    
+    outputBuffer[1] = __offsetOf(s, s.a);
+    outputBuffer[2] = __offsetOf(s, s.b);
+    outputBuffer[3] = __offsetOf(s, s.c);
+    outputBuffer[4] = __offsetOf(s, s.d);
+}