[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>

3 files changed, 12 insertions, 14 deletions

diff --git a/tests/spirv/pointer-from-user-guide.slang b/tests/spirv/pointer-from-user-guide.slang
index 662579c2b..115530b2b 100644
--- a/tests/spirv/pointer-from-user-guide.slang
+++ b/tests/spirv/pointer-from-user-guide.slang
@@ -15,7 +15,7 @@ float test(MyType* pObj)
 {
     //SPV: OpTypePointer
     MyType* pNext = pObj + 1;
-    MyType* pNext2 = &pNext[1];
+    MyType* pNext2 = __getAddress(pNext[1]);
     return pNext.a + pNext->a + (*pNext2).a + pNext2[0].a;
 }
 
diff --git a/tests/spirv/pointer.slang b/tests/spirv/pointer.slang
index affc52e1b..f3b086e6a 100644
--- a/tests/spirv/pointer.slang
+++ b/tests/spirv/pointer.slang
@@ -28,12 +28,12 @@ void funcWithInOutParam(inout PP p)
 
 // CHECK: OpEntryPoint
 
-StructuredBuffer<Data> buffer;
+uniform Data* buffer;
 RWStructuredBuffer<int> output;
 void main(int id : SV_DispatchThreadID)
 {
     output[0] = buffer[0].pNext.data;
-    let pData = &(buffer[0].pNext->data); // operator -> is also allowed on pointer types.
+    let pData = __getAddress(buffer[0].pNext->data); // operator -> is also allowed on pointer types.
     // CHECK: OpPtrAccessChain
     int* pData1 = pData + 1;
     *pData1 = 3;
diff --git a/tests/spirv/ptr-vector-member.slang b/tests/spirv/ptr-vector-member.slang
index 0683d8838..6e493b4c7 100644
--- a/tests/spirv/ptr-vector-member.slang
+++ b/tests/spirv/ptr-vector-member.slang
@@ -1,19 +1,17 @@
-//TEST:SIMPLE(filecheck=CHECK): -target spirv
+//DISABLE_TEST:SIMPLE(filecheck=SPIRV):-stage compute -entry computeMain -target spirv
+//DISABLE_TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-vk -output-using-type -emit-spirv-directly
 
-// CHECK: %[[PTR:[0-9a-zA-Z_]+]] = OpAccessChain %_ptr_PhysicalStorageBuffer_uint %16 %int_0
-// CHECK: %{{.*}} = OpAtomicIAdd %uint %[[PTR]] %uint_1 %uint_0 %uint_1
+// SPIRV: OpEntryPoint
+// SPIRV-NOT: error
 
-struct Push2
-{
-    uint4 * value;
-};
-
-[[vk::push_constant]] Push2 push2;
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+uniform int4* output;
 
 [shader("compute")]
 [numthreads(1, 1, 1)]
-void main()
+void computeMain()
 {
-    uint * v = &push2.value[0].x;
+    // CHECK: 1
+    int* v = __getAddress(output[0].x);
     InterlockedAdd(*v, 1);
 }
\ No newline at end of file