[MLIR][NVVM] Add pmevent

Add nvvm.pmevent Op that Triggers one or more of a fixed number of performance monitor events, with event index or mask specified by immediate operand.

[For more information, see PTX ISA](https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#miscellaneous-instructions-pmevent)

Author: grypp

mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td

@@ -401,6 +401,44 @@ def NVVM_ReduxOp :
    }];   
 }
 
+//===----------------------------------------------------------------------===//
+// NVVM Performance Monitor events
+//===----------------------------------------------------------------------===//
+
+def NVVM_PMEventOp : NVVM_PTXBuilder_Op<"pmevent">,
+  Arguments<(ins OptionalAttr<I16Attr>:$maskedEventId, 
+                 OptionalAttr<I32Attr>:$eventId)> {
+  let summary = "Trigger one or more Performance Monitor events.";
+
+  let description = [{
+    Triggers one or more of a fixed number of performance monitor events, with
+    event index or mask specified by immediate operand.
+
+    Without `mask` it triggers a single performance monitor event indexed by
+    immediate operand a, in the range 0..15.
+
+    With `mask` it triggers one or more of the performance monitor events. Each
+    bit in the 16-bit immediate operand a controls an event.
+
+    [For more information, see PTX ISA](https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#miscellaneous-instructions-pmevent)
+  }];
+  
+  string llvmBuilder = [{
+      llvm::Value *mId = builder.getInt16(* $maskedEventId);
+      createIntrinsicCall(builder, llvm::Intrinsic::nvvm_pm_event_mask, {mId});
+  }];
+
+  let assemblyFormat = "attr-dict (`id` `=` $eventId^)? (`mask` `=` $maskedEventId^)?";
+
+  let extraClassDeclaration = [{
+    bool hasIntrinsic() { if(getEventId()) return false; return true; }
+  }];
+  let extraClassDefinition = [{
+    std::string $cppClass::getPtx() { return std::string("pmevent %0;"); }
+  }];
+  let hasVerifier = 1;
+}
+
 //===----------------------------------------------------------------------===//
 // NVVM Split arrive/wait barrier
 //===----------------------------------------------------------------------===//

mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp

@@ -189,6 +189,24 @@ LogicalResult BulkStoreOp::verify() {
   return success();
 }
 
+LogicalResult PMEventOp::verify() {
+  if (!getMaskedEventId() && !getEventId()) {
+    return emitOpError() << "either `id` or `mask` must be set";
+  }
+
+  if (getMaskedEventId() && getEventId()) {
+    return emitOpError() << "`id` and `mask` cannot be set at the same time";
+  }
+
+  if (getEventId()) {
+    if (getEventId() < 0 || getEventId() > 15) {
+      return emitOpError() << "`id` must be between 0 and 15";
+    }
+  }
+
+  return llvm::success();
+}
+
 // Given the element type of an operand and whether or not it is an accumulator,
 // this function returns the PTX type (`NVVM::MMATypes`) that corresponds to the
 // operand's element type.

mlir/test/Conversion/NVVMToLLVM/nvvm-to-llvm.mlir

@@ -681,3 +681,17 @@ llvm.func @ex2(%input : f32, %pred : i1) {
   %1 = nvvm.inline_ptx "ex2.approx.ftz.f32 $0, $1;" (%input), predicate = %pred  : f32, i1 -> f32
   llvm.return
 }
+
+// -----
+
+// CHECK-LABEL: @nvvm_pmevent
+llvm.func @nvvm_pmevent() {
+  // CHECK: %[[S0:.+]] = llvm.mlir.constant(10 : i32) : i32
+  // CHECK: llvm.inline_asm has_side_effects asm_dialect = att "pmevent $0;", "n" %[[S0]] : (i32) -> ()
+  
+  nvvm.pmevent id = 10
+  // CHECK: %[[S1:.+]] = llvm.mlir.constant(4 : i32) : i32
+  // CHECK: llvm.inline_asm has_side_effects asm_dialect = att "pmevent $0;", "n" %[[S1]] : (i32) -> ()
+  nvvm.pmevent id = 4
+  llvm.return
+}

mlir/test/Target/LLVMIR/nvvmir-invalid.mlir

@@ -1,5 +1,24 @@
 // RUN: mlir-translate -verify-diagnostics -split-input-file -mlir-to-llvmir %s
 
+llvm.func @pmevent_no_id() {
+  // expected-error @below {{either `id` or `mask` must be set}}
+  nvvm.pmevent 
+}
+
+// -----
+
+llvm.func @pmevent_bigger15() {
+  // expected-error @below {{`id` must be between 0 and 15}}
+  nvvm.pmevent id  = 141
+}
+
+// -----
+
+llvm.func @pmevent_many_ids() {
+  // expected-error @below {{`id` and `mask` cannot be set at the same time}}
+  nvvm.pmevent id = 1 mask = 1
+}
+
 // -----
 
 llvm.func @kernel_func(%numberOfThreads : i32) {

mlir/test/Target/LLVMIR/nvvmir.mlir

@@ -918,3 +918,14 @@ llvm.func @nvvm_dot_accumulate_2way(%a: vector<2xi16>, %b: vector<4xi8>, %c: i32
   %7 = nvvm.dot.accumulate.2way %a <signed>, %b <signed>, %c {b_hi = true}: vector<2xi16>, vector<4xi8>
   llvm.return
 }
+
+// -----
+
+// CHECK-LABEL: @nvvm_pmevent
+llvm.func @nvvm_pmevent() {
+  // CHECK: call void @llvm.nvvm.pm.event.mask(i16 15000)
+  nvvm.pmevent mask = 15000
+  // CHECK: call void @llvm.nvvm.pm.event.mask(i16 4)
+  nvvm.pmevent mask = 4
+  llvm.return
+}