[MLIR][omp] Add omp.workshare op #101443

ivanradanov · 2024-08-01T02:15:01Z

1/4 in stack for workshare implementation

1/4 #101443
2/4 #101444
3/4 #101445
4/4 #101446

tblah

Thanks for your work on this. Please could you also add a parse/print test in mlir/test/Dialect/OpenMP/ops.mlir

mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp

kiranchandramohan

Please add some roundtrip tests in mlir/test/Dialect/OpenMP/ops.mlir.

The questions here would be:

Should we have an alternative representation like hlfir.elemental that exposes the implicit loop of the constructs in it.
Should enforce additional constraints on the operations inside the body of the workshare construct? Like should they have loop interfaces?

mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp

llvmbot · 2024-08-19T08:25:35Z

@llvm/pr-subscribers-flang-driver
@llvm/pr-subscribers-flang-fir-hlfir
@llvm/pr-subscribers-mlir

@llvm/pr-subscribers-flang-openmp

Author: Ivan R. Ivanov (ivanradanov)

Changes

1/4 in stack for workshare implementation

1/4 #101443
2/4 #101444
3/4 #101445
4/4 #101446

Full diff: https://github.com/llvm/llvm-project/pull/101443.diff

5 Files Affected:

(modified) mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h (+2)
(modified) mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td (+43)
(modified) mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp (+23)
(modified) mlir/test/Dialect/OpenMP/invalid.mlir (+42)
(modified) mlir/test/Dialect/OpenMP/ops.mlir (+69)

diff --git a/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h b/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h
index 38e4d8f245e4fa..896ca9581c3fc8 100644
--- a/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h
+++ b/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h
@@ -316,6 +316,8 @@ using TeamsOperands =
     detail::Clauses<AllocateClauseOps, IfClauseOps, NumTeamsClauseOps,
                     PrivateClauseOps, ReductionClauseOps, ThreadLimitClauseOps>;
 
+using WorkshareOperands = detail::Clauses<NowaitClauseOps>;
+
 using WsloopOperands =
     detail::Clauses<AllocateClauseOps, LinearClauseOps, NowaitClauseOps,
                     OrderClauseOps, OrderedClauseOps, PrivateClauseOps,
diff --git a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
index 68f92e6952694b..74497def8fd1ab 100644
--- a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
+++ b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
@@ -286,6 +286,49 @@ def SingleOp : OpenMP_Op<"single", traits = [
   let hasVerifier = 1;
 }
 
+//===----------------------------------------------------------------------===//
+// 2.8.3 Workshare Construct
+//===----------------------------------------------------------------------===//
+
+def WorkshareOp : OpenMP_Op<"workshare", traits = [
+    RecursiveMemoryEffects,
+  ], clauses = [
+    OpenMP_NowaitClause,
+  ], singleRegion = true> {
+  let summary = "workshare directive";
+  let description = [{
+    The workshare construct divides the execution of the enclosed structured
+    block into separate units of work, and causes the threads of the team to
+    share the work such that each unit is executed only once by one thread, in
+    the context of its implicit task
+
+    This operation is used for the intermediate representation of the workshare
+    block before the work gets divided between the threads. See the flang
+    LowerWorkshare pass for details.
+  }] # clausesDescription;
+
+  let builders = [
+    OpBuilder<(ins CArg<"const WorkshareOperands &">:$clauses)>
+  ];
+}
+
+def WorkshareLoopWrapperOp : OpenMP_Op<"workshare_loop_wrapper", traits = [
+    DeclareOpInterfaceMethods<LoopWrapperInterface>,
+    RecursiveMemoryEffects, SingleBlock
+  ], singleRegion = true> {
+  let summary = "contains loop nests to be parallelized by workshare";
+  let description = [{
+    This operation wraps a loop nest that is marked for dividing into units of
+    work by an encompassing omp.workshare operation.
+  }];
+
+  let builders = [
+    OpBuilder<(ins), [{ build($_builder, $_state, {}); }]>
+  ];
+  let assemblyFormat = "$region attr-dict";
+  let hasVerifier = 1;
+}
+
 //===----------------------------------------------------------------------===//
 // Loop Nest
 //===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
index 11780f84697b15..90f9a19ebe32b5 100644
--- a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
+++ b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
@@ -1683,6 +1683,29 @@ LogicalResult SingleOp::verify() {
                                   getCopyprivateSyms());
 }
 
+//===----------------------------------------------------------------------===//
+// WorkshareOp
+//===----------------------------------------------------------------------===//
+
+void WorkshareOp::build(OpBuilder &builder, OperationState &state,
+                        const WorkshareOperands &clauses) {
+  WorkshareOp::build(builder, state, clauses.nowait);
+}
+
+//===----------------------------------------------------------------------===//
+// WorkshareLoopWrapperOp
+//===----------------------------------------------------------------------===//
+
+LogicalResult WorkshareLoopWrapperOp::verify() {
+  if (!isWrapper())
+    return emitOpError() << "must be a loop wrapper";
+  if (getNestedWrapper())
+    return emitError() << "nested wrappers not supported";
+  if (!(*this)->getParentOfType<WorkshareOp>())
+    return emitError() << "must be nested in an omp.workshare";
+  return success();
+}
+
 //===----------------------------------------------------------------------===//
 // WsloopOp
 //===----------------------------------------------------------------------===//
diff --git a/mlir/test/Dialect/OpenMP/invalid.mlir b/mlir/test/Dialect/OpenMP/invalid.mlir
index 1d1d93f0977588..ee7c448c467cf5 100644
--- a/mlir/test/Dialect/OpenMP/invalid.mlir
+++ b/mlir/test/Dialect/OpenMP/invalid.mlir
@@ -2383,3 +2383,45 @@ func.func @masked_arg_count_mismatch(%arg0: i32, %arg1: i32) {
     }) : (i32, i32) -> ()
   return
 }
+
+// -----
+func.func @nested_wrapper(%idx : index) {
+  omp.workshare {
+    // expected-error @below {{nested wrappers not supported}}
+    omp.workshare_loop_wrapper {
+      omp.simd {
+        omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+          omp.yield
+        }
+        omp.terminator
+      }
+      omp.terminator
+    }
+    omp.terminator
+  }
+  return
+}
+
+// -----
+func.func @not_wrapper() {
+  omp.workshare {
+    // expected-error @below {{must be a loop wrapper}}
+    omp.workshare_loop_wrapper {
+      omp.terminator
+    }
+    omp.terminator
+  }
+  return
+}
+
+// -----
+func.func @missing_workshare(%idx : index) {
+  // expected-error @below {{must be nested in an omp.workshare}}
+  omp.workshare_loop_wrapper {
+    omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+      omp.yield
+    }
+    omp.terminator
+  }
+  return
+}
diff --git a/mlir/test/Dialect/OpenMP/ops.mlir b/mlir/test/Dialect/OpenMP/ops.mlir
index d2924998f41b87..24363334b4cb54 100644
--- a/mlir/test/Dialect/OpenMP/ops.mlir
+++ b/mlir/test/Dialect/OpenMP/ops.mlir
@@ -2789,3 +2789,72 @@ func.func @omp_target_private(%map1: memref<?xi32>, %map2: memref<?xi32>, %priv_
 
   return
 }
+
+// CHECK-LABEL: func @omp_workshare
+func.func @omp_workshare() {
+  // CHECK: omp.workshare {
+  omp.workshare {
+    "test.payload"() : () -> ()
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_nowait
+func.func @omp_workshare_nowait() {
+  // CHECK: omp.workshare nowait {
+  omp.workshare nowait {
+    "test.payload"() : () -> ()
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_multiple_blocks
+func.func @omp_workshare_multiple_blocks() {
+  // CHECK: omp.workshare {
+  omp.workshare {
+    cf.br ^bb2
+    ^bb2:
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_loop_wrapper
+func.func @omp_workshare_loop_wrapper(%idx : index) {
+  // CHECK-NEXT: omp.workshare {
+  omp.workshare {
+    // CHECK-NEXT: omp.workshare_loop_wrapper
+    omp.workshare_loop_wrapper {
+      // CHECK-NEXT: omp.loop_nest
+      omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+        omp.yield
+      }
+      omp.terminator
+    }
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_loop_wrapper_attrs
+func.func @omp_workshare_loop_wrapper_attrs(%idx : index) {
+  // CHECK-NEXT: omp.workshare {
+  omp.workshare {
+    // CHECK-NEXT: omp.workshare_loop_wrapper {
+    omp.workshare_loop_wrapper {
+      // CHECK-NEXT: omp.loop_nest
+      omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+        omp.yield
+      }
+      omp.terminator
+    // CHECK: } {attr_in_dict}
+    } {attr_in_dict}
+    omp.terminator
+  }
+  return
+}

llvmbot · 2024-08-19T08:25:36Z

@llvm/pr-subscribers-mlir-openmp

Author: Ivan R. Ivanov (ivanradanov)

Changes

1/4 in stack for workshare implementation

1/4 #101443
2/4 #101444
3/4 #101445
4/4 #101446

Full diff: https://github.com/llvm/llvm-project/pull/101443.diff

5 Files Affected:

(modified) mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h (+2)
(modified) mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td (+43)
(modified) mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp (+23)
(modified) mlir/test/Dialect/OpenMP/invalid.mlir (+42)
(modified) mlir/test/Dialect/OpenMP/ops.mlir (+69)

diff --git a/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h b/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h
index 38e4d8f245e4fa..896ca9581c3fc8 100644
--- a/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h
+++ b/mlir/include/mlir/Dialect/OpenMP/OpenMPClauseOperands.h
@@ -316,6 +316,8 @@ using TeamsOperands =
     detail::Clauses<AllocateClauseOps, IfClauseOps, NumTeamsClauseOps,
                     PrivateClauseOps, ReductionClauseOps, ThreadLimitClauseOps>;
 
+using WorkshareOperands = detail::Clauses<NowaitClauseOps>;
+
 using WsloopOperands =
     detail::Clauses<AllocateClauseOps, LinearClauseOps, NowaitClauseOps,
                     OrderClauseOps, OrderedClauseOps, PrivateClauseOps,
diff --git a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
index 68f92e6952694b..74497def8fd1ab 100644
--- a/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
+++ b/mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td
@@ -286,6 +286,49 @@ def SingleOp : OpenMP_Op<"single", traits = [
   let hasVerifier = 1;
 }
 
+//===----------------------------------------------------------------------===//
+// 2.8.3 Workshare Construct
+//===----------------------------------------------------------------------===//
+
+def WorkshareOp : OpenMP_Op<"workshare", traits = [
+    RecursiveMemoryEffects,
+  ], clauses = [
+    OpenMP_NowaitClause,
+  ], singleRegion = true> {
+  let summary = "workshare directive";
+  let description = [{
+    The workshare construct divides the execution of the enclosed structured
+    block into separate units of work, and causes the threads of the team to
+    share the work such that each unit is executed only once by one thread, in
+    the context of its implicit task
+
+    This operation is used for the intermediate representation of the workshare
+    block before the work gets divided between the threads. See the flang
+    LowerWorkshare pass for details.
+  }] # clausesDescription;
+
+  let builders = [
+    OpBuilder<(ins CArg<"const WorkshareOperands &">:$clauses)>
+  ];
+}
+
+def WorkshareLoopWrapperOp : OpenMP_Op<"workshare_loop_wrapper", traits = [
+    DeclareOpInterfaceMethods<LoopWrapperInterface>,
+    RecursiveMemoryEffects, SingleBlock
+  ], singleRegion = true> {
+  let summary = "contains loop nests to be parallelized by workshare";
+  let description = [{
+    This operation wraps a loop nest that is marked for dividing into units of
+    work by an encompassing omp.workshare operation.
+  }];
+
+  let builders = [
+    OpBuilder<(ins), [{ build($_builder, $_state, {}); }]>
+  ];
+  let assemblyFormat = "$region attr-dict";
+  let hasVerifier = 1;
+}
+
 //===----------------------------------------------------------------------===//
 // Loop Nest
 //===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
index 11780f84697b15..90f9a19ebe32b5 100644
--- a/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
+++ b/mlir/lib/Dialect/OpenMP/IR/OpenMPDialect.cpp
@@ -1683,6 +1683,29 @@ LogicalResult SingleOp::verify() {
                                   getCopyprivateSyms());
 }
 
+//===----------------------------------------------------------------------===//
+// WorkshareOp
+//===----------------------------------------------------------------------===//
+
+void WorkshareOp::build(OpBuilder &builder, OperationState &state,
+                        const WorkshareOperands &clauses) {
+  WorkshareOp::build(builder, state, clauses.nowait);
+}
+
+//===----------------------------------------------------------------------===//
+// WorkshareLoopWrapperOp
+//===----------------------------------------------------------------------===//
+
+LogicalResult WorkshareLoopWrapperOp::verify() {
+  if (!isWrapper())
+    return emitOpError() << "must be a loop wrapper";
+  if (getNestedWrapper())
+    return emitError() << "nested wrappers not supported";
+  if (!(*this)->getParentOfType<WorkshareOp>())
+    return emitError() << "must be nested in an omp.workshare";
+  return success();
+}
+
 //===----------------------------------------------------------------------===//
 // WsloopOp
 //===----------------------------------------------------------------------===//
diff --git a/mlir/test/Dialect/OpenMP/invalid.mlir b/mlir/test/Dialect/OpenMP/invalid.mlir
index 1d1d93f0977588..ee7c448c467cf5 100644
--- a/mlir/test/Dialect/OpenMP/invalid.mlir
+++ b/mlir/test/Dialect/OpenMP/invalid.mlir
@@ -2383,3 +2383,45 @@ func.func @masked_arg_count_mismatch(%arg0: i32, %arg1: i32) {
     }) : (i32, i32) -> ()
   return
 }
+
+// -----
+func.func @nested_wrapper(%idx : index) {
+  omp.workshare {
+    // expected-error @below {{nested wrappers not supported}}
+    omp.workshare_loop_wrapper {
+      omp.simd {
+        omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+          omp.yield
+        }
+        omp.terminator
+      }
+      omp.terminator
+    }
+    omp.terminator
+  }
+  return
+}
+
+// -----
+func.func @not_wrapper() {
+  omp.workshare {
+    // expected-error @below {{must be a loop wrapper}}
+    omp.workshare_loop_wrapper {
+      omp.terminator
+    }
+    omp.terminator
+  }
+  return
+}
+
+// -----
+func.func @missing_workshare(%idx : index) {
+  // expected-error @below {{must be nested in an omp.workshare}}
+  omp.workshare_loop_wrapper {
+    omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+      omp.yield
+    }
+    omp.terminator
+  }
+  return
+}
diff --git a/mlir/test/Dialect/OpenMP/ops.mlir b/mlir/test/Dialect/OpenMP/ops.mlir
index d2924998f41b87..24363334b4cb54 100644
--- a/mlir/test/Dialect/OpenMP/ops.mlir
+++ b/mlir/test/Dialect/OpenMP/ops.mlir
@@ -2789,3 +2789,72 @@ func.func @omp_target_private(%map1: memref<?xi32>, %map2: memref<?xi32>, %priv_
 
   return
 }
+
+// CHECK-LABEL: func @omp_workshare
+func.func @omp_workshare() {
+  // CHECK: omp.workshare {
+  omp.workshare {
+    "test.payload"() : () -> ()
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_nowait
+func.func @omp_workshare_nowait() {
+  // CHECK: omp.workshare nowait {
+  omp.workshare nowait {
+    "test.payload"() : () -> ()
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_multiple_blocks
+func.func @omp_workshare_multiple_blocks() {
+  // CHECK: omp.workshare {
+  omp.workshare {
+    cf.br ^bb2
+    ^bb2:
+    // CHECK: omp.terminator
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_loop_wrapper
+func.func @omp_workshare_loop_wrapper(%idx : index) {
+  // CHECK-NEXT: omp.workshare {
+  omp.workshare {
+    // CHECK-NEXT: omp.workshare_loop_wrapper
+    omp.workshare_loop_wrapper {
+      // CHECK-NEXT: omp.loop_nest
+      omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+        omp.yield
+      }
+      omp.terminator
+    }
+    omp.terminator
+  }
+  return
+}
+
+// CHECK-LABEL: func @omp_workshare_loop_wrapper_attrs
+func.func @omp_workshare_loop_wrapper_attrs(%idx : index) {
+  // CHECK-NEXT: omp.workshare {
+  omp.workshare {
+    // CHECK-NEXT: omp.workshare_loop_wrapper {
+    omp.workshare_loop_wrapper {
+      // CHECK-NEXT: omp.loop_nest
+      omp.loop_nest (%iv) : index = (%idx) to (%idx) step (%idx) {
+        omp.yield
+      }
+      omp.terminator
+    // CHECK: } {attr_in_dict}
+    } {attr_in_dict}
+    omp.terminator
+  }
+  return
+}

tblah

LGTM. Thanks for the updates

skatrak

Thank you, this LGTM as well. Just a small nit about the name for WorkshareLoopWrapperOp.

mlir/include/mlir/Dialect/OpenMP/OpenMPOps.td

Add custom omp loop wrapper Add recursive memory effects trait to workshare Remove stray include Remove omp.workshare verifier Add assembly format for wrapper and add test Add verification and descriptions wrong replace Fix wsloopwrapperop Fix op tests

ivanradanov requested review from kiranchandramohan and Thirumalai-Shaktivel August 1, 2024 02:15

This was referenced Aug 1, 2024

[flang][omp] Emit omp.workshare in frontend #101444

Merged

[flang] Introduce custom loop nest generation for loops in workshare construct #101445

Merged

[flang] Lower omp.workshare to other omp constructs #101446

Merged

tblah reviewed Aug 1, 2024

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kiranchandramohan requested a review from skatrak August 1, 2024 09:34

kiranchandramohan reviewed Aug 2, 2024

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ivanradanov force-pushed the flang-workshare-omp branch from cc551ca to 7376fd4 Compare August 19, 2024 04:02

ivanradanov changed the base branch from main to users/ivanradanov/flang-openmp-passes August 19, 2024 04:06

ivanradanov marked this pull request as ready for review August 19, 2024 08:25

ivanradanov requested review from tblah and kiranchandramohan August 19, 2024 08:25

llvmbot added mlir mlir:openmp flang:openmp labels Aug 19, 2024

ivanradanov force-pushed the users/ivanradanov/flang-openmp-passes branch from ce3ad06 to 7065222 Compare August 19, 2024 08:40

ivanradanov force-pushed the flang-workshare-omp branch from d030f24 to 72e19fa Compare August 19, 2024 08:40

tblah approved these changes Aug 21, 2024

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ivanradanov deleted the branch llvm:main August 21, 2024 13:59

ivanradanov closed this Aug 21, 2024

ivanradanov reopened this Aug 21, 2024

ivanradanov changed the base branch from users/ivanradanov/flang-openmp-passes to main August 21, 2024 14:01

llvmbot added flang:driver flang Flang issues not falling into any other category flang:fir-hlfir labels Aug 21, 2024

ivanradanov force-pushed the flang-workshare-omp branch from 72e19fa to 45a8aa4 Compare August 21, 2024 14:07

skatrak approved these changes Aug 21, 2024

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ivanradanov force-pushed the flang-workshare-omp branch 2 times, most recently from 8503797 to d343f3a Compare August 22, 2024 08:59

ivanradanov force-pushed the flang-workshare-omp branch from 45a5069 to f8d7b47 Compare October 19, 2024 16:37

[MLIR][omp] Add omp.workshare op

fa6e0dd

Add custom omp loop wrapper Add recursive memory effects trait to workshare Remove stray include Remove omp.workshare verifier Add assembly format for wrapper and add test Add verification and descriptions wrong replace Fix wsloopwrapperop Fix op tests

ivanradanov force-pushed the flang-workshare-omp branch from d001eec to fa6e0dd Compare November 19, 2024 04:02

ivanradanov merged commit 980d5fb into llvm:main Nov 19, 2024
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ivanradanov deleted the flang-workshare-omp branch November 19, 2024 07:44

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