[llvm] Update documentation for buffer fat pointers (PR #92034)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Krzysztof Drewniak (krzysz00)

<details>
<summary>Changes</summary>

Now that we've got (minus some issues around datatypes and invariant loads) working lowerings for address space 7, update the table in the AMDGPU usage guide to proerly indicate the nature of these address spaces.

---
Full diff: https://github.com/llvm/llvm-project/pull/92034.diff


1 Files Affected:

- (modified) llvm/docs/AMDGPUUsage.rst (+2-2) 


``````````diff
diff --git a/llvm/docs/AMDGPUUsage.rst b/llvm/docs/AMDGPUUsage.rst
index 029db00134c09..edf58b562a449 100644
--- a/llvm/docs/AMDGPUUsage.rst
+++ b/llvm/docs/AMDGPUUsage.rst
@@ -824,8 +824,8 @@ supported for the ``amdgcn`` target.
      Constant                              4               constant    *same as global* 64      0x0000000000000000
      Private                               5               private     scratch          32      0xFFFFFFFF
      Constant 32-bit                       6               *TODO*                               0x00000000
-     Buffer Fat Pointer (experimental)     7               *TODO*
-     Buffer Resource (experimental)        8               *TODO*
+     Buffer Fat Pointer                    7               N/A         N/A              160     0
+     Buffer Resource                       8               N/A         V#               128     0x00000000000000000000000000000000
      Buffer Strided Pointer (experimental) 9               *TODO*
      Streamout Registers                   128             N/A         GS_REGS
      ===================================== =============== =========== ================ ======= ============================

``````````

</details>


https://github.com/llvm/llvm-project/pull/92034