[CBP] Pointer frontend changes + groupshared pointer support (#7848)

Resolves #7628
Resolves: #8197

Primary Goals:
1. Add `Access` to pointer
2. AddressSpace::GroupShared support for pointers (SPIR-V)
3. Add `__getAddress()` to replace `&`
* `&` is not updated to `require(cpu)` since slangpy uses `&`. This
means we must: (1) merge PR; (2) replace `&` with `__getAddress()`; (3)
add `require(cpu)` to `&`

Changes:
* Added to `Ptr` the `Access` generic argument & logic (for
`Access::Read`).
* Moved the generic argument `AddressSpace` from `Ptr` to the end of the
type.
* Added pointer casting support between any `Ptr` as long as the
`AddressSpace` is the same
* Disallow globallycoherent T* and coherent T*
* Disallow const T*, T const*, and const T*
* Fixed .natvis display of `ConstantValue` `ValOperandNode`
* Support generic resolution of type-casted integers
* Added `VariablePointer` emitting for spirv + other minor logic needed
for groupshared pointers

Breaking Changes:
* Anyone using the `AddressSpace` of `Ptr` will now have to account for
the `Access` argument
* we disallow various syntax paired with `Ptr` and `T*`

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/language-feature/pointer/ptr-to-groupshared.slang b/tests/language-feature/pointer/ptr-to-groupshared.slang
new file mode 100644
index 000000000..3ad4c5e0b
--- /dev/null
+++ b/tests/language-feature/pointer/ptr-to-groupshared.slang
@@ -0,0 +1,30 @@
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-vk -output-using-type -emit-spirv-directly
+
+// Tests if we handle passing groupshared address-space pointers correctly to a function
+// when that data-type needs legalization (Data -> Data_natural due to `lower-buffer-element-type`).
+// CHECK: 1
+// CHECK-NEXT: 2
+// CHECK-NEXT: 0
+
+struct Data
+{
+    int value1;
+    int value2;
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0], stride=4):out,name=outputBuffer
+uniform int* outputBuffer;
+groupshared Data shared;
+
+void foo(Ptr<Data, Access::ReadWrite, AddressSpace::GroupShared> ptr)
+{
+    outputBuffer[0] = ptr.value1;
+    outputBuffer[1] = ptr.value2;
+}
+
+[numthreads(3, 1, 1)]
+void computeMain(uint3 group_thread_id: SV_GroupThreadID)
+{
+    shared = Data(1, 2);
+    foo(__getAddress(shared));
+}
\ No newline at end of file