https://github.com/ivanradanov created
https://github.com/llvm/llvm-project/pull/104748
WIP I will be adding unit tests and I am considering if we should have
integrations tests for the entire omp.workshare pipeline.
>From 793ae50dd00c4347bea78ca6ecd33783c69de354 Mon Sep 17 00:00:00 2001
From: Ivan Radanov Ivanov <ivanov.i...@m.titech.ac.jp>
Date: Sun, 4 Aug 2024 17:33:52 +0900
Subject: [PATCH 1/5] Add workshare loop wrapper lowerings
---
.../lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp | 6 ++++--
.../HLFIR/Transforms/OptimizedBufferization.cpp | 10 +++++++---
2 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp
b/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp
index b608677c526310..1848dbe2c7a2c2 100644
--- a/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp
+++ b/flang/lib/Optimizer/HLFIR/Transforms/BufferizeHLFIR.cpp
@@ -26,12 +26,13 @@
#include "flang/Optimizer/HLFIR/HLFIRDialect.h"
#include "flang/Optimizer/HLFIR/HLFIROps.h"
#include "flang/Optimizer/HLFIR/Passes.h"
+#include "flang/Optimizer/OpenMP/Passes.h"
+#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include "mlir/IR/Dominance.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Pass/PassManager.h"
#include "mlir/Transforms/DialectConversion.h"
-#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include "llvm/ADT/TypeSwitch.h"
namespace hlfir {
@@ -792,7 +793,8 @@ struct ElementalOpConversion
// Generate a loop nest looping around the fir.elemental shape and clone
// fir.elemental region inside the inner loop.
hlfir::LoopNest loopNest =
- hlfir::genLoopNest(loc, builder, extents, !elemental.isOrdered());
+ hlfir::genLoopNest(loc, builder, extents, !elemental.isOrdered(),
+ flangomp::shouldUseWorkshareLowering(elemental));
auto insPt = builder.saveInsertionPoint();
builder.setInsertionPointToStart(loopNest.body);
auto yield = hlfir::inlineElementalOp(loc, builder, elemental,
diff --git a/flang/lib/Optimizer/HLFIR/Transforms/OptimizedBufferization.cpp
b/flang/lib/Optimizer/HLFIR/Transforms/OptimizedBufferization.cpp
index c4aed6b79df923..150e3e91197241 100644
--- a/flang/lib/Optimizer/HLFIR/Transforms/OptimizedBufferization.cpp
+++ b/flang/lib/Optimizer/HLFIR/Transforms/OptimizedBufferization.cpp
@@ -20,6 +20,7 @@
#include "flang/Optimizer/HLFIR/HLFIRDialect.h"
#include "flang/Optimizer/HLFIR/HLFIROps.h"
#include "flang/Optimizer/HLFIR/Passes.h"
+#include "flang/Optimizer/OpenMP/Passes.h"
#include "flang/Optimizer/Transforms/Utils.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/Dominance.h"
@@ -482,7 +483,8 @@ llvm::LogicalResult
ElementalAssignBufferization::matchAndRewrite(
// Generate a loop nest looping around the hlfir.elemental shape and clone
// hlfir.elemental region inside the inner loop
hlfir::LoopNest loopNest =
- hlfir::genLoopNest(loc, builder, extents, !elemental.isOrdered());
+ hlfir::genLoopNest(loc, builder, extents, !elemental.isOrdered(),
+ flangomp::shouldUseWorkshareLowering(elemental));
builder.setInsertionPointToStart(loopNest.body);
auto yield = hlfir::inlineElementalOp(loc, builder, elemental,
loopNest.oneBasedIndices);
@@ -553,7 +555,8 @@ llvm::LogicalResult
BroadcastAssignBufferization::matchAndRewrite(
llvm::SmallVector<mlir::Value> extents =
hlfir::getIndexExtents(loc, builder, shape);
hlfir::LoopNest loopNest =
- hlfir::genLoopNest(loc, builder, extents, /*isUnordered=*/true);
+ hlfir::genLoopNest(loc, builder, extents, /*isUnordered=*/true,
+ flangomp::shouldUseWorkshareLowering(assign));
builder.setInsertionPointToStart(loopNest.body);
auto arrayElement =
hlfir::getElementAt(loc, builder, lhs, loopNest.oneBasedIndices);
@@ -648,7 +651,8 @@ llvm::LogicalResult
VariableAssignBufferization::matchAndRewrite(
llvm::SmallVector<mlir::Value> extents =
hlfir::getIndexExtents(loc, builder, shape);
hlfir::LoopNest loopNest =
- hlfir::genLoopNest(loc, builder, extents, /*isUnordered=*/true);
+ hlfir::genLoopNest(loc, builder, extents, /*isUnordered=*/true,
+ flangomp::shouldUseWorkshareLowering(assign));
builder.setInsertionPointToStart(loopNest.body);
auto rhsArrayElement =
hlfir::getElementAt(loc, builder, rhs, loopNest.oneBasedIndices);
>From d7ba8a1598f517a5a3c8401d22b81b50114112f1 Mon Sep 17 00:00:00 2001
From: Ivan Radanov Ivanov <ivanov.i...@m.titech.ac.jp>
Date: Mon, 19 Aug 2024 15:01:31 +0900
Subject: [PATCH 2/5] Bufferize test
---
flang/test/HLFIR/bufferize-workshare.fir | 58 ++++++++++++++++++++++++
1 file changed, 58 insertions(+)
create mode 100644 flang/test/HLFIR/bufferize-workshare.fir
diff --git a/flang/test/HLFIR/bufferize-workshare.fir
b/flang/test/HLFIR/bufferize-workshare.fir
new file mode 100644
index 00000000000000..86a2f031478dd7
--- /dev/null
+++ b/flang/test/HLFIR/bufferize-workshare.fir
@@ -0,0 +1,58 @@
+// RUN: fir-opt --bufferize-hlfir %s | FileCheck %s
+
+// CHECK-LABEL: func.func @simple(
+// CHECK-SAME: %[[VAL_0:.*]]:
!fir.ref<!fir.array<42xi32>>) {
+// CHECK: omp.parallel {
+// CHECK: omp.workshare {
+// CHECK: %[[VAL_1:.*]] = arith.constant 42 : index
+// CHECK: %[[VAL_2:.*]] = arith.constant 1 : i32
+// CHECK: %[[VAL_3:.*]] = fir.shape %[[VAL_1]] : (index) ->
!fir.shape<1>
+// CHECK: %[[VAL_4:.*]]:2 = hlfir.declare %[[VAL_0]](%[[VAL_3]])
{uniq_name = "array"} : (!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) ->
(!fir.ref<!fir.array<42xi32>>, !fir.ref<!fir.array<42xi32>>)
+// CHECK: %[[VAL_5:.*]] = fir.allocmem !fir.array<42xi32>
{bindc_name = ".tmp.array", uniq_name = ""}
+// CHECK: %[[VAL_6:.*]]:2 = hlfir.declare %[[VAL_5]](%[[VAL_3]])
{uniq_name = ".tmp.array"} : (!fir.heap<!fir.array<42xi32>>, !fir.shape<1>) ->
(!fir.heap<!fir.array<42xi32>>, !fir.heap<!fir.array<42xi32>>)
+// CHECK: %[[VAL_7:.*]] = arith.constant true
+// CHECK: %[[VAL_8:.*]] = arith.constant 1 : index
+// CHECK: omp.wsloop {
+// CHECK: omp.loop_nest (%[[VAL_9:.*]]) : index = (%[[VAL_8]])
to (%[[VAL_1]]) inclusive step (%[[VAL_8]]) {
+// CHECK: %[[VAL_10:.*]] = hlfir.designate %[[VAL_4]]#0
(%[[VAL_9]]) : (!fir.ref<!fir.array<42xi32>>, index) -> !fir.ref<i32>
+// CHECK: %[[VAL_11:.*]] = fir.load %[[VAL_10]] :
!fir.ref<i32>
+// CHECK: %[[VAL_12:.*]] = arith.subi %[[VAL_11]],
%[[VAL_2]] : i32
+// CHECK: %[[VAL_13:.*]] = hlfir.designate %[[VAL_6]]#0
(%[[VAL_9]]) : (!fir.heap<!fir.array<42xi32>>, index) -> !fir.ref<i32>
+// CHECK: hlfir.assign %[[VAL_12]] to %[[VAL_13]]
temporary_lhs : i32, !fir.ref<i32>
+// CHECK: omp.yield
+// CHECK: }
+// CHECK: omp.terminator
+// CHECK: }
+// CHECK: %[[VAL_14:.*]] = fir.undefined
tuple<!fir.heap<!fir.array<42xi32>>, i1>
+// CHECK: %[[VAL_15:.*]] = fir.insert_value %[[VAL_14]],
%[[VAL_7]], [1 : index] : (tuple<!fir.heap<!fir.array<42xi32>>, i1>, i1) ->
tuple<!fir.heap<!fir.array<42xi32>>, i1>
+// CHECK: %[[VAL_16:.*]] = fir.insert_value %[[VAL_15]],
%[[VAL_6]]#0, [0 : index] : (tuple<!fir.heap<!fir.array<42xi32>>, i1>,
!fir.heap<!fir.array<42xi32>>) -> tuple<!fir.heap<!fir.array<42xi32>>, i1>
+// CHECK: hlfir.assign %[[VAL_6]]#0 to %[[VAL_4]]#0 :
!fir.heap<!fir.array<42xi32>>, !fir.ref<!fir.array<42xi32>>
+// CHECK: fir.freemem %[[VAL_6]]#0 :
!fir.heap<!fir.array<42xi32>>
+// CHECK: omp.terminator
+// CHECK: }
+// CHECK: omp.terminator
+// CHECK: }
+// CHECK: return
+// CHECK: }
+func.func @simple(%arg: !fir.ref<!fir.array<42xi32>>) {
+ omp.parallel {
+ omp.workshare {
+ %c42 = arith.constant 42 : index
+ %c1_i32 = arith.constant 1 : i32
+ %shape = fir.shape %c42 : (index) -> !fir.shape<1>
+ %array:2 = hlfir.declare %arg(%shape) {uniq_name = "array"} :
(!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<42xi32>>,
!fir.ref<!fir.array<42xi32>>)
+ %elemental = hlfir.elemental %shape unordered : (!fir.shape<1>) ->
!hlfir.expr<42xi32> {
+ ^bb0(%i: index):
+ %ref = hlfir.designate %array#0 (%i) : (!fir.ref<!fir.array<42xi32>>,
index) -> !fir.ref<i32>
+ %val = fir.load %ref : !fir.ref<i32>
+ %sub = arith.subi %val, %c1_i32 : i32
+ hlfir.yield_element %sub : i32
+ }
+ hlfir.assign %elemental to %array#0 : !hlfir.expr<42xi32>,
!fir.ref<!fir.array<42xi32>>
+ hlfir.destroy %elemental : !hlfir.expr<42xi32>
+ omp.terminator
+ }
+ omp.terminator
+ }
+ return
+}
>From 98d96651e9e9ebf4418d0a5ce22cc1ed99deafbc Mon Sep 17 00:00:00 2001
From: Ivan Radanov Ivanov <ivanov.i...@m.titech.ac.jp>
Date: Mon, 19 Aug 2024 15:03:42 +0900
Subject: [PATCH 3/5] Bufferize test
---
flang/test/HLFIR/bufferize-workshare.fir | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/flang/test/HLFIR/bufferize-workshare.fir
b/flang/test/HLFIR/bufferize-workshare.fir
index 86a2f031478dd7..33b368a62eaabf 100644
--- a/flang/test/HLFIR/bufferize-workshare.fir
+++ b/flang/test/HLFIR/bufferize-workshare.fir
@@ -12,7 +12,7 @@
// CHECK: %[[VAL_6:.*]]:2 = hlfir.declare %[[VAL_5]](%[[VAL_3]])
{uniq_name = ".tmp.array"} : (!fir.heap<!fir.array<42xi32>>, !fir.shape<1>) ->
(!fir.heap<!fir.array<42xi32>>, !fir.heap<!fir.array<42xi32>>)
// CHECK: %[[VAL_7:.*]] = arith.constant true
// CHECK: %[[VAL_8:.*]] = arith.constant 1 : index
-// CHECK: omp.wsloop {
+// CHECK: "omp.workshare_loop_wrapper"() ({
// CHECK: omp.loop_nest (%[[VAL_9:.*]]) : index = (%[[VAL_8]])
to (%[[VAL_1]]) inclusive step (%[[VAL_8]]) {
// CHECK: %[[VAL_10:.*]] = hlfir.designate %[[VAL_4]]#0
(%[[VAL_9]]) : (!fir.ref<!fir.array<42xi32>>, index) -> !fir.ref<i32>
// CHECK: %[[VAL_11:.*]] = fir.load %[[VAL_10]] :
!fir.ref<i32>
@@ -22,7 +22,7 @@
// CHECK: omp.yield
// CHECK: }
// CHECK: omp.terminator
-// CHECK: }
+// CHECK: }) : () -> ()
// CHECK: %[[VAL_14:.*]] = fir.undefined
tuple<!fir.heap<!fir.array<42xi32>>, i1>
// CHECK: %[[VAL_15:.*]] = fir.insert_value %[[VAL_14]],
%[[VAL_7]], [1 : index] : (tuple<!fir.heap<!fir.array<42xi32>>, i1>, i1) ->
tuple<!fir.heap<!fir.array<42xi32>>, i1>
// CHECK: %[[VAL_16:.*]] = fir.insert_value %[[VAL_15]],
%[[VAL_6]]#0, [0 : index] : (tuple<!fir.heap<!fir.array<42xi32>>, i1>,
!fir.heap<!fir.array<42xi32>>) -> tuple<!fir.heap<!fir.array<42xi32>>, i1>
>From 4cf8f35f8ffdc12686d61bdfa23ee48fe91cebac Mon Sep 17 00:00:00 2001
From: Ivan Radanov Ivanov <ivanov.i...@m.titech.ac.jp>
Date: Mon, 19 Aug 2024 15:04:39 +0900
Subject: [PATCH 4/5] Bufferize test
---
flang/test/HLFIR/bufferize-workshare.fir | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/flang/test/HLFIR/bufferize-workshare.fir
b/flang/test/HLFIR/bufferize-workshare.fir
index 33b368a62eaabf..02fe6b1d1799c3 100644
--- a/flang/test/HLFIR/bufferize-workshare.fir
+++ b/flang/test/HLFIR/bufferize-workshare.fir
@@ -12,7 +12,7 @@
// CHECK: %[[VAL_6:.*]]:2 = hlfir.declare %[[VAL_5]](%[[VAL_3]])
{uniq_name = ".tmp.array"} : (!fir.heap<!fir.array<42xi32>>, !fir.shape<1>) ->
(!fir.heap<!fir.array<42xi32>>, !fir.heap<!fir.array<42xi32>>)
// CHECK: %[[VAL_7:.*]] = arith.constant true
// CHECK: %[[VAL_8:.*]] = arith.constant 1 : index
-// CHECK: "omp.workshare_loop_wrapper"() ({
+// CHECK: omp.workshare_loop_wrapper {
// CHECK: omp.loop_nest (%[[VAL_9:.*]]) : index = (%[[VAL_8]])
to (%[[VAL_1]]) inclusive step (%[[VAL_8]]) {
// CHECK: %[[VAL_10:.*]] = hlfir.designate %[[VAL_4]]#0
(%[[VAL_9]]) : (!fir.ref<!fir.array<42xi32>>, index) -> !fir.ref<i32>
// CHECK: %[[VAL_11:.*]] = fir.load %[[VAL_10]] :
!fir.ref<i32>
@@ -22,7 +22,7 @@
// CHECK: omp.yield
// CHECK: }
// CHECK: omp.terminator
-// CHECK: }) : () -> ()
+// CHECK: }
// CHECK: %[[VAL_14:.*]] = fir.undefined
tuple<!fir.heap<!fir.array<42xi32>>, i1>
// CHECK: %[[VAL_15:.*]] = fir.insert_value %[[VAL_14]],
%[[VAL_7]], [1 : index] : (tuple<!fir.heap<!fir.array<42xi32>>, i1>, i1) ->
tuple<!fir.heap<!fir.array<42xi32>>, i1>
// CHECK: %[[VAL_16:.*]] = fir.insert_value %[[VAL_15]],
%[[VAL_6]]#0, [0 : index] : (tuple<!fir.heap<!fir.array<42xi32>>, i1>,
!fir.heap<!fir.array<42xi32>>) -> tuple<!fir.heap<!fir.array<42xi32>>, i1>
>From c948ec66218853bcc5c7d985ddacb58ab1fdc4e0 Mon Sep 17 00:00:00 2001
From: Ivan Radanov Ivanov <ivanov.i...@m.titech.ac.jp>
Date: Mon, 19 Aug 2024 16:53:40 +0900
Subject: [PATCH 5/5] Add test for should use workshare lowering
---
.../OpenMP/should-use-workshare-lowering.mlir | 140 ++++++++++++++++++
1 file changed, 140 insertions(+)
create mode 100644
flang/test/Transforms/OpenMP/should-use-workshare-lowering.mlir
diff --git a/flang/test/Transforms/OpenMP/should-use-workshare-lowering.mlir
b/flang/test/Transforms/OpenMP/should-use-workshare-lowering.mlir
new file mode 100644
index 00000000000000..2ba445faf780ea
--- /dev/null
+++ b/flang/test/Transforms/OpenMP/should-use-workshare-lowering.mlir
@@ -0,0 +1,140 @@
+// RUN: fir-opt --bufferize-hlfir %s | FileCheck %s
+
+// Checks that we correctly identify when to use the lowering to
+// omp.workshare_loop_wrapper
+
+// CHECK-LABEL: @should_parallelize_0
+// CHECK: omp.workshare_loop_wrapper
+func.func @should_parallelize_0(%arg: !fir.ref<!fir.array<42xi32>>, %idx :
index) {
+ omp.workshare {
+ %c42 = arith.constant 42 : index
+ %c1_i32 = arith.constant 1 : i32
+ %shape = fir.shape %c42 : (index) -> !fir.shape<1>
+ %array:2 = hlfir.declare %arg(%shape) {uniq_name = "array"} :
(!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<42xi32>>,
!fir.ref<!fir.array<42xi32>>)
+ %elemental = hlfir.elemental %shape unordered : (!fir.shape<1>) ->
!hlfir.expr<42xi32> {
+ ^bb0(%i: index):
+ hlfir.yield_element %c1_i32 : i32
+ }
+ hlfir.assign %elemental to %array#0 : !hlfir.expr<42xi32>,
!fir.ref<!fir.array<42xi32>>
+ hlfir.destroy %elemental : !hlfir.expr<42xi32>
+ omp.terminator
+ }
+ return
+}
+
+// CHECK-LABEL: @should_parallelize_1
+// CHECK: omp.workshare_loop_wrapper
+func.func @should_parallelize_1(%arg: !fir.ref<!fir.array<42xi32>>, %idx :
index) {
+ omp.parallel {
+ omp.workshare {
+ %c42 = arith.constant 42 : index
+ %c1_i32 = arith.constant 1 : i32
+ %shape = fir.shape %c42 : (index) -> !fir.shape<1>
+ %array:2 = hlfir.declare %arg(%shape) {uniq_name = "array"} :
(!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<42xi32>>,
!fir.ref<!fir.array<42xi32>>)
+ %elemental = hlfir.elemental %shape unordered : (!fir.shape<1>) ->
!hlfir.expr<42xi32> {
+ ^bb0(%i: index):
+ hlfir.yield_element %c1_i32 : i32
+ }
+ hlfir.assign %elemental to %array#0 : !hlfir.expr<42xi32>,
!fir.ref<!fir.array<42xi32>>
+ hlfir.destroy %elemental : !hlfir.expr<42xi32>
+ omp.terminator
+ }
+ omp.terminator
+ }
+ return
+}
+
+
+// CHECK-LABEL: @should_not_parallelize_0
+// CHECK-NOT: omp.workshare_loop_wrapper
+func.func @should_not_parallelize_0(%arg: !fir.ref<!fir.array<42xi32>>, %idx :
index) {
+ omp.workshare {
+ omp.single {
+ %c42 = arith.constant 42 : index
+ %c1_i32 = arith.constant 1 : i32
+ %shape = fir.shape %c42 : (index) -> !fir.shape<1>
+ %array:2 = hlfir.declare %arg(%shape) {uniq_name = "array"} :
(!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<42xi32>>,
!fir.ref<!fir.array<42xi32>>)
+ %elemental = hlfir.elemental %shape unordered : (!fir.shape<1>) ->
!hlfir.expr<42xi32> {
+ ^bb0(%i: index):
+ hlfir.yield_element %c1_i32 : i32
+ }
+ hlfir.assign %elemental to %array#0 : !hlfir.expr<42xi32>,
!fir.ref<!fir.array<42xi32>>
+ hlfir.destroy %elemental : !hlfir.expr<42xi32>
+ omp.terminator
+ }
+ omp.terminator
+ }
+ return
+}
+
+// CHECK-LABEL: @should_not_parallelize_1
+// CHECK-NOT: omp.workshare_loop_wrapper
+func.func @should_not_parallelize_1(%arg: !fir.ref<!fir.array<42xi32>>, %idx :
index) {
+ omp.workshare {
+ omp.critical {
+ %c42 = arith.constant 42 : index
+ %c1_i32 = arith.constant 1 : i32
+ %shape = fir.shape %c42 : (index) -> !fir.shape<1>
+ %array:2 = hlfir.declare %arg(%shape) {uniq_name = "array"} :
(!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<42xi32>>,
!fir.ref<!fir.array<42xi32>>)
+ %elemental = hlfir.elemental %shape unordered : (!fir.shape<1>) ->
!hlfir.expr<42xi32> {
+ ^bb0(%i: index):
+ hlfir.yield_element %c1_i32 : i32
+ }
+ hlfir.assign %elemental to %array#0 : !hlfir.expr<42xi32>,
!fir.ref<!fir.array<42xi32>>
+ hlfir.destroy %elemental : !hlfir.expr<42xi32>
+ omp.terminator
+ }
+ omp.terminator
+ }
+ return
+}
+
+// CHECK-LABEL: @should_not_parallelize_2
+// CHECK-NOT: omp.workshare_loop_wrapper
+func.func @should_not_parallelize_2(%arg: !fir.ref<!fir.array<42xi32>>, %idx :
index) {
+ omp.workshare {
+ omp.parallel {
+ %c42 = arith.constant 42 : index
+ %c1_i32 = arith.constant 1 : i32
+ %shape = fir.shape %c42 : (index) -> !fir.shape<1>
+ %array:2 = hlfir.declare %arg(%shape) {uniq_name = "array"} :
(!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<42xi32>>,
!fir.ref<!fir.array<42xi32>>)
+ %elemental = hlfir.elemental %shape unordered : (!fir.shape<1>) ->
!hlfir.expr<42xi32> {
+ ^bb0(%i: index):
+ hlfir.yield_element %c1_i32 : i32
+ }
+ hlfir.assign %elemental to %array#0 : !hlfir.expr<42xi32>,
!fir.ref<!fir.array<42xi32>>
+ hlfir.destroy %elemental : !hlfir.expr<42xi32>
+ omp.terminator
+ }
+ omp.terminator
+ }
+ return
+}
+
+// CHECK-LABEL: @should_not_parallelize_3
+// CHECK-NOT: omp.workshare_loop_wrapper
+func.func @should_not_parallelize_3(%arg: !fir.ref<!fir.array<42xi32>>, %idx :
index) {
+ omp.workshare {
+ omp.parallel {
+ omp.workshare {
+ omp.parallel {
+ %c42 = arith.constant 42 : index
+ %c1_i32 = arith.constant 1 : i32
+ %shape = fir.shape %c42 : (index) -> !fir.shape<1>
+ %array:2 = hlfir.declare %arg(%shape) {uniq_name = "array"} :
(!fir.ref<!fir.array<42xi32>>, !fir.shape<1>) -> (!fir.ref<!fir.array<42xi32>>,
!fir.ref<!fir.array<42xi32>>)
+ %elemental = hlfir.elemental %shape unordered : (!fir.shape<1>) ->
!hlfir.expr<42xi32> {
+ ^bb0(%i: index):
+ hlfir.yield_element %c1_i32 : i32
+ }
+ hlfir.assign %elemental to %array#0 : !hlfir.expr<42xi32>,
!fir.ref<!fir.array<42xi32>>
+ hlfir.destroy %elemental : !hlfir.expr<42xi32>
+ omp.terminator
+ }
+ omp.terminator
+ }
+ omp.terminator
+ }
+ omp.terminator
+ }
+ return
+}
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