================
@@ -84,6 +91,11 @@ enum : unsigned {
// Some places use this if the address space can't be determined.
UNKNOWN_ADDRESS_SPACE = ~0u,
};
+
+/// The BARRIER AS is does not have an aperture in HW, so when converting
+/// BARRIER addresses from/to generic, we represent them as LDS addresses
+/// offset by a large amount so they can never alias with real LDS memory.
----------------
nhaehnle wrote:
I agree we need to be able to roundtrip this address space through
`addrspace(0)`, but I don't follow this point.
Taking a barrier pointer, casting it to flat/generic and then trying to
load/store it is inherently undefined behavior as mentioned in AMDGPUUsage.rst
(though perhaps it could be a bit more explicit).
https://github.com/llvm/llvm-project/pull/195613
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