[Mlir-commits] [libc] [libcxx] [llvm] [compiler-rt] [clang-tools-extra] [clang] [mlir] [flang] [mlir][nvvm] Introduce `fence.mbarrier.init` (PR #74058)

[Guray Ozen]

https://github.com/grypp updated https://github.com/llvm/llvm-project/pull/74058

>From 9f35504e81246f97a9d8c14a06043685660ae15e Mon Sep 17 00:00:00 2001
From: Guray Ozen <guray.ozen at gmail.com>
Date: Fri, 1 Dec 2023 11:10:40 +0100
Subject: [PATCH 1/2] [mlir][nvvm] Introduce `fence.mbarrier.init`

This PR introduce `fence.mbarrier.init` OP
---
 mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td       | 10 ++++++++++
 mlir/test/Conversion/NVVMToLLVM/nvvm-to-llvm.mlir |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td b/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td
index ecad1a16eb6c5..f400c18b5f32c 100644
--- a/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td
@@ -422,6 +422,16 @@ def NVVM_SetMaxRegisterOp : NVVM_PTXBuilder_Op<"setmaxregister"> {
   let hasVerifier = 1;
 }
 
+def NVVM_FenceMbarrierInitOp : NVVM_PTXBuilder_Op<"fence.mbarrier.init"> {
+  let arguments = (ins );
+  let assemblyFormat = "attr-dict";
+  let extraClassDefinition = [{        
+    std::string $cppClass::getPtx() {
+      return std::string("fence.mbarrier_init.release.cluster;");
+    }
+  }];
+}
+
 def ShflKindBfly : I32EnumAttrCase<"bfly", 0>;
 def ShflKindUp   : I32EnumAttrCase<"up", 1>;
 def ShflKindDown : I32EnumAttrCase<"down", 2>;
diff --git a/mlir/test/Conversion/NVVMToLLVM/nvvm-to-llvm.mlir b/mlir/test/Conversion/NVVMToLLVM/nvvm-to-llvm.mlir
index 5482cc194192d..8366f1d109b1c 100644
--- a/mlir/test/Conversion/NVVMToLLVM/nvvm-to-llvm.mlir
+++ b/mlir/test/Conversion/NVVMToLLVM/nvvm-to-llvm.mlir
@@ -629,3 +629,11 @@ func.func @cp_bulk_commit() {
   nvvm.cp.async.bulk.commit.group
   func.return
 }
+
+// -----
+
+func.func @fence_mbarrier_init() {
+  //CHECK: llvm.inline_asm has_side_effects asm_dialect = att "fence.mbarrier_init.release.cluster;"
+  nvvm.fence.mbarrier.init
+  func.return
+}

>From 34e29b2bef58739dbcc2e34efcec644accd5c089 Mon Sep 17 00:00:00 2001
From: Guray Ozen <guray.ozen at gmail.com>
Date: Fri, 1 Dec 2023 16:00:37 +0100
Subject: [PATCH 2/2] add descripton

---
 mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td b/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td
index f400c18b5f32c..adc60e72fdf82 100644
--- a/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td
@@ -424,6 +424,12 @@ def NVVM_SetMaxRegisterOp : NVVM_PTXBuilder_Op<"setmaxregister"> {
 
 def NVVM_FenceMbarrierInitOp : NVVM_PTXBuilder_Op<"fence.mbarrier.init"> {
   let arguments = (ins );
+    let description = [{
+    Fence operation that applies on the prior nvvm.mbarrier.init
+    [For more information, see PTX ISA]
+    (https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#parallel-synchronization-and-communication-instructions-membar)
+  }];
+  
   let assemblyFormat = "attr-dict";
   let extraClassDefinition = [{        
     std::string $cppClass::getPtx() {