[llvm-branch-commits] [mlir] [MLIR][OpenMP] Make omp.taskloop into a loop wrapper (PR #87253)

Sergio Afonso via llvm-branch-commits llvm-branch-commits at lists.llvm.org
Mon Apr 1 09:09:10 PDT 2024


https://github.com/skatrak created https://github.com/llvm/llvm-project/pull/87253

This patch updates the definition of `omp.taskloop` to enforce the restrictions of a wrapper operation.

>From daaf4f7fec79aeebf37b4a1d83d89d19904fb417 Mon Sep 17 00:00:00 2001
From: Sergio Afonso <safonsof at amd.com>
Date: Mon, 1 Apr 2024 17:05:38 +0100
Subject: [PATCH] [MLIR][OpenMP] Make omp.taskloop into a loop wrapper

This patch updates the definition of `omp.taskloop` to enforce the restrictions
of a wrapper operation.
---
 mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td |  39 ++-
 mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp  |  10 +
 mlir/test/Dialect/OpenMP/invalid.mlir         |  92 +++++---
 mlir/test/Dialect/OpenMP/ops.mlir             | 222 ++++++++++--------
 4 files changed, 212 insertions(+), 151 deletions(-)

diff --git a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
index a7bf93deae2fb3..b7660d6cd0ea5d 100644
--- a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
+++ b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
@@ -985,10 +985,10 @@ def TaskOp : OpenMP_Op<"task", [AttrSizedOperandSegments,
 }
 
 def TaskloopOp : OpenMP_Op<"taskloop", [AttrSizedOperandSegments,
-                           AutomaticAllocationScope, RecursiveMemoryEffects,
-                           AllTypesMatch<["lowerBound", "upperBound", "step"]>,
+                           AutomaticAllocationScope,
                            DeclareOpInterfaceMethods<LoopWrapperInterface>,
-                           ReductionClauseInterface]> {
+                           RecursiveMemoryEffects, ReductionClauseInterface,
+                           SingleBlockImplicitTerminator<"TerminatorOp">]> {
   let summary = "taskloop construct";
   let description = [{
     The taskloop construct specifies that the iterations of one or more
@@ -996,21 +996,19 @@ def TaskloopOp : OpenMP_Op<"taskloop", [AttrSizedOperandSegments,
     iterations are distributed across tasks generated by the construct and
     scheduled to be executed.
 
-    The `lowerBound` and `upperBound` specify a half-open range: the range
-    includes the lower bound but does not include the upper bound. If the
-    `inclusive` attribute is specified then the upper bound is also included.
-    The `step` specifies the loop step.
-
-    The body region can contain any number of blocks.
+    The body region can contain a single block which must contain a single
+    operation and a terminator. The operation must be another compatible loop
+    wrapper or an `omp.loop_nest`.
 
     ```
-    omp.taskloop <clauses>
-    for (%i1, %i2) : index = (%c0, %c0) to (%c10, %c10) step (%c1, %c1) {
-      %a = load %arrA[%i1, %i2] : memref<?x?xf32>
-      %b = load %arrB[%i1, %i2] : memref<?x?xf32>
-      %sum = arith.addf %a, %b : f32
-      store %sum, %arrC[%i1, %i2] : memref<?x?xf32>
-      omp.terminator
+    omp.taskloop <clauses> {
+      omp.loop_nest (%i1, %i2) : index = (%c0, %c0) to (%c10, %c10) step (%c1, %c1) {
+        %a = load %arrA[%i1, %i2] : memref<?x?xf32>
+        %b = load %arrB[%i1, %i2] : memref<?x?xf32>
+        %sum = arith.addf %a, %b : f32
+        store %sum, %arrC[%i1, %i2] : memref<?x?xf32>
+        omp.yield
+      }
     }
     ```
 
@@ -1087,11 +1085,7 @@ def TaskloopOp : OpenMP_Op<"taskloop", [AttrSizedOperandSegments,
     created.
   }];
 
-  let arguments = (ins Variadic<IntLikeType>:$lowerBound,
-                       Variadic<IntLikeType>:$upperBound,
-                       Variadic<IntLikeType>:$step,
-                       UnitAttr:$inclusive,
-                       Optional<I1>:$if_expr,
+  let arguments = (ins Optional<I1>:$if_expr,
                        Optional<I1>:$final_expr,
                        UnitAttr:$untied,
                        UnitAttr:$mergeable,
@@ -1130,8 +1124,7 @@ def TaskloopOp : OpenMP_Op<"taskloop", [AttrSizedOperandSegments,
           |`grain_size` `(` $grain_size `:` type($grain_size) `)`
           |`num_tasks` `(` $num_tasks `:` type($num_tasks) `)`
           |`nogroup` $nogroup
-    ) `for` custom<LoopControl>($region, $lowerBound, $upperBound, $step,
-                                  type($step), $inclusive) attr-dict
+    ) $region attr-dict
   }];
 
   let extraClassDeclaration = [{
diff --git a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
index 564c23201db4fd..c92e593c20dc45 100644
--- a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
+++ b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
@@ -1659,6 +1659,16 @@ LogicalResult TaskloopOp::verify() {
         "the grainsize clause and num_tasks clause are mutually exclusive and "
         "may not appear on the same taskloop directive");
   }
+
+  if (!isWrapper())
+    return emitOpError() << "must be a loop wrapper";
+
+  if (LoopWrapperInterface nested = getNestedWrapper()) {
+    // Check for the allowed leaf constructs that may appear in a composite
+    // construct directly after TASKLOOP.
+    if (!isa<SimdLoopOp>(nested))
+      return emitError() << "only supported nested wrapper is 'omp.simdloop'";
+  }
   return success();
 }
 
diff --git a/mlir/test/Dialect/OpenMP/invalid.mlir b/mlir/test/Dialect/OpenMP/invalid.mlir
index 8f4103dabee5df..4e9f3b0cff064d 100644
--- a/mlir/test/Dialect/OpenMP/invalid.mlir
+++ b/mlir/test/Dialect/OpenMP/invalid.mlir
@@ -1561,10 +1561,11 @@ func.func @omp_cancellationpoint2() {
 func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testmemref = "test.memref"() : () -> (memref<i32>)
   // expected-error @below {{expected equal sizes for allocate and allocator variables}}
-  "omp.taskloop"(%lb, %ub, %ub, %lb, %step, %step, %testmemref) ({
-  ^bb0(%arg3: i32, %arg4: i32):
-    "omp.terminator"() : () -> ()
-  }) {operandSegmentSizes = array<i32: 2, 2, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0>} : (i32, i32, i32, i32, i32, i32, memref<i32>) -> ()
+  "omp.taskloop"(%testmemref) ({
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
+  }) {operandSegmentSizes = array<i32: 0, 0, 0, 0, 0, 1, 0, 0, 0>} : (memref<i32>) -> ()
   return
 }
 
@@ -1574,10 +1575,11 @@ func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testf32 = "test.f32"() : () -> (!llvm.ptr)
   %testf32_2 = "test.f32"() : () -> (!llvm.ptr)
   // expected-error @below {{expected as many reduction symbol references as reduction variables}}
-  "omp.taskloop"(%lb, %ub, %ub, %lb, %step, %step, %testf32, %testf32_2) ({
-  ^bb0(%arg3: i32, %arg4: i32):
-    "omp.terminator"() : () -> ()
-  }) {operandSegmentSizes = array<i32: 2, 2, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0>, reductions = [@add_f32]} : (i32, i32, i32, i32, i32, i32, !llvm.ptr, !llvm.ptr) -> ()
+  "omp.taskloop"(%testf32, %testf32_2) ({
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
+  }) {operandSegmentSizes = array<i32: 0, 0, 0, 2, 0, 0, 0, 0, 0>, reductions = [@add_f32]} : (!llvm.ptr, !llvm.ptr) -> ()
   return
 }
 
@@ -1585,12 +1587,12 @@ func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
 
 func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testf32 = "test.f32"() : () -> (!llvm.ptr)
-  %testf32_2 = "test.f32"() : () -> (!llvm.ptr)
   // expected-error @below {{expected as many reduction symbol references as reduction variables}}
-  "omp.taskloop"(%lb, %ub, %ub, %lb, %step, %step, %testf32) ({
-  ^bb0(%arg3: i32, %arg4: i32):
-    "omp.terminator"() : () -> ()
-  }) {operandSegmentSizes = array<i32: 2, 2, 2, 0, 0, 0, 1, 0, 0, 0, 0, 0>, reductions = [@add_f32, @add_f32]} : (i32, i32, i32, i32, i32, i32, !llvm.ptr) -> ()
+  "omp.taskloop"(%testf32) ({
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
+  }) {operandSegmentSizes = array<i32: 0, 0, 0, 1, 0, 0, 0, 0, 0>, reductions = [@add_f32, @add_f32]} : (!llvm.ptr) -> ()
   return
 }
 
@@ -1600,10 +1602,11 @@ func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testf32 = "test.f32"() : () -> (!llvm.ptr)
   %testf32_2 = "test.f32"() : () -> (!llvm.ptr)
   // expected-error @below {{expected as many reduction symbol references as reduction variables}}
-  "omp.taskloop"(%lb, %ub, %ub, %lb, %step, %step, %testf32, %testf32_2) ({
-  ^bb0(%arg3: i32, %arg4: i32):
-    "omp.terminator"() : () -> ()
-  }) {in_reductions = [@add_f32], operandSegmentSizes = array<i32: 2, 2, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0>} : (i32, i32, i32, i32, i32, i32, !llvm.ptr, !llvm.ptr) -> ()
+  "omp.taskloop"(%testf32, %testf32_2) ({
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
+  }) {in_reductions = [@add_f32], operandSegmentSizes = array<i32: 0, 0, 2, 0, 0, 0, 0, 0, 0>} : (!llvm.ptr, !llvm.ptr) -> ()
   return
 }
 
@@ -1611,12 +1614,12 @@ func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
 
 func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testf32 = "test.f32"() : () -> (!llvm.ptr)
-  %testf32_2 = "test.f32"() : () -> (!llvm.ptr)
   // expected-error @below {{expected as many reduction symbol references as reduction variables}}
-  "omp.taskloop"(%lb, %ub, %ub, %lb, %step, %step, %testf32_2) ({
-  ^bb0(%arg3: i32, %arg4: i32):
-    "omp.terminator"() : () -> ()
-  }) {in_reductions = [@add_f32, @add_f32], operandSegmentSizes = array<i32: 2, 2, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0>} : (i32, i32, i32, i32, i32, i32, !llvm.ptr) -> ()
+  "omp.taskloop"(%testf32) ({
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
+  }) {in_reductions = [@add_f32, @add_f32], operandSegmentSizes = array<i32: 0, 0, 1, 0, 0, 0, 0, 0, 0>} : (!llvm.ptr) -> ()
   return
 }
 
@@ -1638,9 +1641,10 @@ func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testf32 = "test.f32"() : () -> (!llvm.ptr)
   %testf32_2 = "test.f32"() : () -> (!llvm.ptr)
   // expected-error @below {{if a reduction clause is present on the taskloop directive, the nogroup clause must not be specified}}
-  omp.taskloop reduction(@add_f32 -> %testf32 : !llvm.ptr, @add_f32 -> %testf32_2 : !llvm.ptr) nogroup
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    omp.terminator
+  omp.taskloop reduction(@add_f32 -> %testf32 : !llvm.ptr, @add_f32 -> %testf32_2 : !llvm.ptr) nogroup {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
   }
   return
 }
@@ -1662,9 +1666,10 @@ combiner {
 func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testf32 = "test.f32"() : () -> (!llvm.ptr)
   // expected-error @below {{the same list item cannot appear in both a reduction and an in_reduction clause}}
-  omp.taskloop reduction(@add_f32 -> %testf32 : !llvm.ptr) in_reduction(@add_f32 -> %testf32 : !llvm.ptr)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    omp.terminator
+  omp.taskloop reduction(@add_f32 -> %testf32 : !llvm.ptr) in_reduction(@add_f32 -> %testf32 : !llvm.ptr) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
   }
   return
 }
@@ -1674,8 +1679,20 @@ func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
 func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
   %testi64 = "test.i64"() : () -> (i64)
   // expected-error @below {{the grainsize clause and num_tasks clause are mutually exclusive and may not appear on the same taskloop directive}}
-  omp.taskloop grain_size(%testi64: i64) num_tasks(%testi64: i64)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+  omp.taskloop grain_size(%testi64: i64) num_tasks(%testi64: i64) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      omp.yield
+    }
+  }
+  return
+}
+
+// -----
+
+func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
+  // expected-error @below {{op must be a loop wrapper}}
+  omp.taskloop {
+    %0 = arith.constant 0 : i32
     omp.terminator
   }
   return
@@ -1683,6 +1700,21 @@ func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
 
 // -----
 
+func.func @taskloop(%lb: i32, %ub: i32, %step: i32) {
+  // expected-error @below {{only supported nested wrapper is 'omp.simdloop'}}
+  omp.taskloop {
+    omp.distribute {
+      omp.loop_nest (%iv) : i32 = (%lb) to (%ub) step (%step) {
+        omp.yield
+      }
+      omp.terminator
+    }
+  }
+  return
+}
+
+// -----
+
 func.func @omp_threadprivate() {
   %1 = llvm.mlir.addressof @_QFsubEx : !llvm.ptr
   // expected-error @below {{op failed to verify that all of {sym_addr, tls_addr} have same type}}
diff --git a/mlir/test/Dialect/OpenMP/ops.mlir b/mlir/test/Dialect/OpenMP/ops.mlir
index 8d9acab67e0358..5b57bbc2cafda1 100644
--- a/mlir/test/Dialect/OpenMP/ops.mlir
+++ b/mlir/test/Dialect/OpenMP/ops.mlir
@@ -171,6 +171,23 @@ func.func @omp_loop_nest(%lb : index, %ub : index, %step : index) -> () {
     omp.yield
   }
 
+  // TODO Remove induction variables from omp.wsloop.
+  omp.wsloop for (%iv) : index = (%lb) to (%ub) step (%step) {
+    // CHECK: omp.loop_nest
+    // CHECK-SAME: (%{{.*}}) : index =
+    // CHECK-SAME: (%{{.*}}) to (%{{.*}}) step (%{{.*}})
+    "omp.loop_nest" (%lb, %ub, %step) ({
+    ^bb0(%iv2: index):
+      // CHECK: test.op1
+      "test.op1"(%lb) : (index) -> ()
+      // CHECK: test.op2
+      "test.op2"() : () -> ()
+      // CHECK: omp.yield
+      omp.yield
+    }) : (index, index, index) -> ()
+    omp.yield
+  }
+
   return
 }
 
@@ -209,6 +226,22 @@ func.func @omp_loop_nest_pretty(%lb : index, %ub : index, %step : index) -> () {
     omp.yield
   }
 
+  // TODO Remove induction variables from omp.wsloop.
+  omp.wsloop for (%iv) : index = (%lb) to (%ub) step (%step) {
+    // CHECK: omp.loop_nest
+    // CHECK-SAME: (%{{.*}}) : index =
+    // CHECK-SAME: (%{{.*}}) to (%{{.*}}) step (%{{.*}})
+    omp.loop_nest (%iv2) : index = (%lb) to (%ub) step (%step)  {
+      // CHECK: test.op1
+      "test.op1"(%lb) : (index) -> ()
+      // CHECK: test.op2
+      "test.op2"() : () -> ()
+      // CHECK: omp.yield
+      omp.yield
+    }
+    omp.yield
+  }
+
   return
 }
 
@@ -1993,135 +2026,128 @@ func.func @omp_taskgroup_clauses() -> () {
 // CHECK-LABEL: @omp_taskloop
 func.func @omp_taskloop(%lb: i32, %ub: i32, %step: i32) -> () {
 
-  // CHECK: omp.taskloop for (%{{.+}}) : i32 = (%{{.+}}) to (%{{.+}}) step (%{{.+}}) {
-  omp.taskloop for (%i) : i32 = (%lb) to (%ub) step (%step)  {
-    // CHECK: omp.terminator
-    omp.terminator
-  }
-
-  // CHECK: omp.taskloop for (%{{.+}}) : i32 = (%{{.+}}) to (%{{.+}}) step (%{{.+}}) {
-  omp.taskloop for (%i) : i32 = (%lb) to (%ub) step (%step)  {
-    // CHECK: test.op1
-    "test.op1"(%lb) : (i32) -> ()
-    // CHECK: test.op2
-    "test.op2"() : () -> ()
-    // CHECK: omp.terminator
-    omp.terminator
-  }
-
-  // CHECK: omp.taskloop for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
-  }
-
-  // CHECK: omp.taskloop for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) inclusive step (%{{.+}}, %{{.+}}) {
-  omp.taskloop for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) inclusive step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop {
+  omp.taskloop {
+    omp.loop_nest (%i) : i32 = (%lb) to (%ub) step (%step)  {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
   %testbool = "test.bool"() : () -> (i1)
 
-  // CHECK: omp.taskloop if(%{{[^)]+}})
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop if(%testbool)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop if(%{{[^)]+}}) {
+  omp.taskloop if(%testbool) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
-  // CHECK: omp.taskloop final(%{{[^)]+}})
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop final(%testbool)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop final(%{{[^)]+}}) {
+  omp.taskloop final(%testbool) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
-  // CHECK: omp.taskloop untied
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop untied
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop untied {
+  omp.taskloop untied {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
-  // CHECK: omp.taskloop mergeable
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop mergeable
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop mergeable {
+  omp.taskloop mergeable {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
   %testf32 = "test.f32"() : () -> (!llvm.ptr)
   %testf32_2 = "test.f32"() : () -> (!llvm.ptr)
-  // CHECK: omp.taskloop in_reduction(@add_f32 -> %{{.+}} : !llvm.ptr, @add_f32 -> %{{.+}} : !llvm.ptr)
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop in_reduction(@add_f32 -> %testf32 : !llvm.ptr, @add_f32 -> %testf32_2 : !llvm.ptr)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop in_reduction(@add_f32 -> %{{.+}} : !llvm.ptr, @add_f32 -> %{{.+}} : !llvm.ptr) {
+  omp.taskloop in_reduction(@add_f32 -> %testf32 : !llvm.ptr, @add_f32 -> %testf32_2 : !llvm.ptr) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
-  // CHECK: omp.taskloop reduction(@add_f32 -> %{{.+}} : !llvm.ptr, @add_f32 -> %{{.+}} : !llvm.ptr)
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop reduction(@add_f32 -> %testf32 : !llvm.ptr, @add_f32 -> %testf32_2 : !llvm.ptr)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop reduction(@add_f32 -> %{{.+}} : !llvm.ptr, @add_f32 -> %{{.+}} : !llvm.ptr) {
+  omp.taskloop reduction(@add_f32 -> %testf32 : !llvm.ptr, @add_f32 -> %testf32_2 : !llvm.ptr) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
-  // CHECK: omp.taskloop in_reduction(@add_f32 -> %{{.+}} : !llvm.ptr) reduction(@add_f32 -> %{{.+}} : !llvm.ptr)
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop in_reduction(@add_f32 -> %testf32 : !llvm.ptr) reduction(@add_f32 -> %testf32_2 : !llvm.ptr)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop in_reduction(@add_f32 -> %{{.+}} : !llvm.ptr) reduction(@add_f32 -> %{{.+}} : !llvm.ptr) {
+  omp.taskloop in_reduction(@add_f32 -> %testf32 : !llvm.ptr) reduction(@add_f32 -> %testf32_2 : !llvm.ptr) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
   %testi32 = "test.i32"() : () -> (i32)
-  // CHECK: omp.taskloop priority(%{{[^:]+}}: i32)
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop priority(%testi32: i32)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop priority(%{{[^:]+}}: i32) {
+  omp.taskloop priority(%testi32: i32) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
   %testmemref = "test.memref"() : () -> (memref<i32>)
-  // CHECK: omp.taskloop allocate(%{{.+}} : memref<i32> -> %{{.+}} : memref<i32>)
-  omp.taskloop allocate(%testmemref : memref<i32> -> %testmemref : memref<i32>)
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop allocate(%{{.+}} : memref<i32> -> %{{.+}} : memref<i32>) {
+  omp.taskloop allocate(%testmemref : memref<i32> -> %testmemref : memref<i32>) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
   %testi64 = "test.i64"() : () -> (i64)
-  // CHECK: omp.taskloop grain_size(%{{[^:]+}}: i64)
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop grain_size(%testi64: i64)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop grain_size(%{{[^:]+}}: i64) {
+  omp.taskloop grain_size(%testi64: i64) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
-  // CHECK: omp.taskloop num_tasks(%{{[^:]+}}: i64)
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop num_tasks(%testi64: i64)
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop num_tasks(%{{[^:]+}}: i64) {
+  omp.taskloop num_tasks(%testi64: i64) {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
-  // CHECK: omp.taskloop nogroup
-  // CHECK-SAME: for (%{{.+}}, %{{.+}}) : i32 = (%{{.+}}, %{{.+}}) to (%{{.+}}, %{{.+}}) step (%{{.+}}, %{{.+}}) {
-  omp.taskloop nogroup
-  for (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
-    // CHECK: omp.terminator
-    omp.terminator
+  // CHECK: omp.taskloop nogroup {
+  omp.taskloop nogroup {
+    omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+      // CHECK: omp.yield
+      omp.yield
+    }
+  }
+
+  // CHECK: omp.taskloop {
+  omp.taskloop {
+    // TODO Remove induction variables from omp.simdloop.
+    omp.simdloop for (%iv) : i32 = (%lb) to (%ub) step (%step) {
+      omp.loop_nest (%i, %j) : i32 = (%lb, %ub) to (%ub, %lb) step (%step, %step) {
+        // CHECK: omp.yield
+        omp.yield
+      }
+      // CHECK: omp.yield
+      omp.yield
+    }
   }
 
   // CHECK: return



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