[llvm] [LLVM][NVPTX] Add movmatrix intrinsic and PTX instruction support (PR #190109)

[Varad Rahul Kamthe via llvm-commits]

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@@ -3936,6 +3936,36 @@ an event.
 For more information on the pmevent instructions, refer to the `PTX ISA
 <https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#miscellaneous-instructions-pmevent>`__.
 
+Warp-level Matrix Transpose Intrinsics
+---------------------------------------
+
+'``llvm.nvvm.movmatrix.sync.aligned.m8n8.trans.b16``'
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+.. code-block:: llvm
+
+  declare i32 @llvm.nvvm.movmatrix.sync.aligned.m8n8.trans.b16(i32 %src)
+
+Overview:
+"""""""""
+
+The '``@llvm.nvvm.movmatrix.sync.aligned.m8n8.trans.b16``' intrinsic
+transposes an 8x8 matrix of 16-bit elements distributed across all 32
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varadk27 wrote:

Sticking with `i32 `as we wanted to keep the types similar to to ldmatrix which return `i32 `instead of `<2 x i16>`

https://github.com/llvm/llvm-project/pull/190109