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Merged
kparzysz merged 14 commits into from
Jan 22, 2024
Merged

[Flang][OpenMP] Restructure recursive lowering in createBodyOfOp #77761

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62f3165
[Flang][OpenMP] Separate creation of work-sharing and SIMD loops, NFC
kparzysz Dec 20, 2023
841ae5f
[Flang][OpenMP] Push genEval calls to individual operations, NFC
kparzysz Jan 9, 2024
67ea0e5
[Flang][OpenMP] Handle SECTION construct from within SECTIONS
kparzysz Jan 9, 2024
883afd9
[Flang][OpenMP] Push genEval closer to leaf lowering functions
kparzysz Jan 8, 2024
1b5524a
[Flang][OpenMP] Restructure recursive lowering in `createBodyOfOp`
kparzysz Jan 8, 2024
cc411f2
Merge branch 'main' into users/kparzysz/spr/a04-geneval-in-leafs
kparzysz Jan 15, 2024
cb3f267
Add parameter description for genNested
kparzysz Jan 15, 2024
51a9edf
Merge branch 'users/kparzysz/spr/a04-geneval-in-leafs' into users/kpa…
kparzysz Jan 15, 2024
a1b59bf
Add more detailed checks to testcase
kparzysz Jan 15, 2024
8ead6c5
Add testcase from https://github.com/llvm/llvm-project/pull/77329
kparzysz Jan 15, 2024
9394b96
Trigger new build
kparzysz Jan 16, 2024
00ad95a
Merge branch 'main' into users/kparzysz/spr/a05-complete-createBodyOfOp
kparzysz Jan 18, 2024
1207d60
Replace assertion with constructing unique block
kparzysz Jan 18, 2024
bb6795e
Update flang/lib/Lower/OpenMP.cpp
kparzysz Jan 19, 2024
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4 changes: 2 additions & 2 deletions flang/include/flang/Lower/OpenMP.h
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Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,8 @@ struct Variable;
} // namespace pft

// Generate the OpenMP terminator for Operation at Location.
void genOpenMPTerminator(fir::FirOpBuilder &, mlir::Operation *,
mlir::Location);
mlir::Operation *genOpenMPTerminator(fir::FirOpBuilder &, mlir::Operation *,
mlir::Location);

void genOpenMPConstruct(AbstractConverter &, Fortran::lower::SymMap &,
semantics::SemanticsContext &, pft::Evaluation &,
Expand Down
133 changes: 92 additions & 41 deletions flang/lib/Lower/OpenMP.cpp
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Expand Up @@ -385,7 +385,8 @@ void DataSharingProcessor::insertLastPrivateCompare(mlir::Operation *op) {
// construct
mlir::OpBuilder::InsertPoint unstructuredSectionsIP =
firOpBuilder.saveInsertionPoint();
firOpBuilder.setInsertionPointToStart(&op->getRegion(0).back());
mlir::Operation *lastOper = op->getRegion(0).back().getTerminator();
firOpBuilder.setInsertionPoint(lastOper);
lastPrivIP = firOpBuilder.saveInsertionPoint();
firOpBuilder.restoreInsertionPoint(unstructuredSectionsIP);
}
Expand Down Expand Up @@ -2135,15 +2136,6 @@ static mlir::Type getLoopVarType(Fortran::lower::AbstractConverter &converter,
return converter.getFirOpBuilder().getIntegerType(loopVarTypeSize);
}

static void resetBeforeTerminator(fir::FirOpBuilder &firOpBuilder,
mlir::Operation *storeOp,
mlir::Block &block) {
if (storeOp)
firOpBuilder.setInsertionPointAfter(storeOp);
else
firOpBuilder.setInsertionPointToStart(&block);
}

static mlir::Operation *
createAndSetPrivatizedLoopVar(Fortran::lower::AbstractConverter &converter,
mlir::Location loc, mlir::Value indexVal,
Expand Down Expand Up @@ -2186,11 +2178,43 @@ static void createBodyOfOp(
const llvm::SmallVector<const Fortran::semantics::Symbol *> &args = {},
bool outerCombined = false, DataSharingProcessor *dsp = nullptr) {
fir::FirOpBuilder &firOpBuilder = converter.getFirOpBuilder();

auto insertMarker = [](fir::FirOpBuilder &builder) {
mlir::Value undef = builder.create<fir::UndefOp>(builder.getUnknownLoc(),
builder.getIndexType());
return undef.getDefiningOp();
};

// Find the block where the OMP terminator should go. In simple cases
// it is the single block in the operation's region. When the region
// is more complicated, especially with unstructured control flow, there
// may be multiple blocks, and some of them may have non-OMP terminators
// resulting from lowering of the code contained within the operation.
// By OpenMP rules, there should be a single exit point from the region:
// here exit means transfering control to the code following the operation.
// STOP statement is allowed and does not count as exit for the purpose of
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@kiranchandramohan kiranchandramohan Jan 18, 2024

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Where is the STOP statement accounted for here? The code here looks like find the block without a terminator and assert that there is only ONE.

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@kparzysz kparzysz Jan 18, 2024

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STOP is lowered as a function call, so we don't really see it as a control-flow construct in FIR.

Otherwise, you're right---it looks for blocks that haven't been terminated by any nested construct (i.e. after removing the temporary terminator at the end of the region), and asserts if there are more than 1.

// inserting terminators.
auto findExitBlock = [&](mlir::Region &region) -> mlir::Block * {
auto isTerminated = [](mlir::Block &block) -> bool {
if (block.empty())
return false;
return block.back().hasTrait<mlir::OpTrait::IsTerminator>();
};

mlir::Block *exit = nullptr;
for (auto &block : region) {
if (!isTerminated(block)) {
assert(exit == nullptr && "Multiple exit block in OpenMP region");
exit = &block;
}
}
return exit;
};

// If an argument for the region is provided then create the block with that
// argument. Also update the symbol's address with the mlir argument value.
// e.g. For loops the argument is the induction variable. And all further
// uses of the induction variable should use this mlir value.
mlir::Operation *storeOp = nullptr;
if (args.size()) {
std::size_t loopVarTypeSize = 0;
for (const Fortran::semantics::Symbol *arg : args)
Expand All @@ -2201,20 +2225,20 @@ static void createBodyOfOp(
firOpBuilder.createBlock(&op.getRegion(), {}, tiv, locs);
// The argument is not currently in memory, so make a temporary for the
// argument, and store it there, then bind that location to the argument.
mlir::Operation *storeOp = nullptr;
for (auto [argIndex, argSymbol] : llvm::enumerate(args)) {
mlir::Value indexVal =
fir::getBase(op.getRegion().front().getArgument(argIndex));
storeOp =
createAndSetPrivatizedLoopVar(converter, loc, indexVal, argSymbol);
}
firOpBuilder.setInsertionPointAfter(storeOp);
} else {
firOpBuilder.createBlock(&op.getRegion());
}
// Set the insert for the terminator operation to go at the end of the
// block - this is either empty or the block with the stores above,
// the end of the block works for both.
mlir::Block &block = op.getRegion().back();
firOpBuilder.setInsertionPointToEnd(&block);

// Mark the earliest insertion point.
mlir::Operation *marker = insertMarker(firOpBuilder);

// If it is an unstructured region and is not the outer region of a combined
// construct, create empty blocks for all evaluations.
Expand All @@ -2223,37 +2247,64 @@ static void createBodyOfOp(
mlir::omp::YieldOp>(
firOpBuilder, eval.getNestedEvaluations());

// Insert the terminator.
Fortran::lower::genOpenMPTerminator(firOpBuilder, op.getOperation(), loc);
// Reset the insert point to before the terminator.
resetBeforeTerminator(firOpBuilder, storeOp, block);
// Start with privatization, so that the lowering of the nested
// code will use the right symbols.
constexpr bool isLoop = std::is_same_v<Op, mlir::omp::WsLoopOp> ||
std::is_same_v<Op, mlir::omp::SimdLoopOp>;
bool privatize = clauses && !outerCombined;

// Handle privatization. Do not privatize if this is the outer operation.
if (clauses && !outerCombined) {
constexpr bool isLoop = std::is_same_v<Op, mlir::omp::WsLoopOp> ||
std::is_same_v<Op, mlir::omp::SimdLoopOp>;
firOpBuilder.setInsertionPoint(marker);
std::optional<DataSharingProcessor> tempDsp;
if (privatize) {
if (!dsp) {
DataSharingProcessor proc(converter, *clauses, eval);
proc.processStep1();
proc.processStep2(op, isLoop);
} else {
if (isLoop && args.size() > 0)
dsp->setLoopIV(converter.getSymbolAddress(*args[0]));
dsp->processStep2(op, isLoop);
tempDsp.emplace(converter, *clauses, eval);
tempDsp->processStep1();
}

if (storeOp)
firOpBuilder.setInsertionPointAfter(storeOp);
}

if constexpr (std::is_same_v<Op, mlir::omp::ParallelOp>) {
threadPrivatizeVars(converter, eval);
if (clauses)
if (clauses) {
firOpBuilder.setInsertionPoint(marker);
ClauseProcessor(converter, *clauses).processCopyin();
}
}

if (genNested)
if (genNested) {
// genFIR(Evaluation&) tries to patch up unterminated blocks, causing
// a lot of trouble if the terminator generation is delayed past this
// point. Insert a temporary terminator here, then delete it.
firOpBuilder.setInsertionPointToEnd(&op.getRegion().back());
auto *temp = Fortran::lower::genOpenMPTerminator(firOpBuilder,
op.getOperation(), loc);
firOpBuilder.setInsertionPointAfter(marker);
genNestedEvaluations(converter, eval);
temp->erase();
}

if (auto *exitBlock = findExitBlock(op.getRegion())) {
firOpBuilder.setInsertionPointToEnd(exitBlock);
auto *term = Fortran::lower::genOpenMPTerminator(firOpBuilder,
op.getOperation(), loc);
// Only insert lastprivate code when there actually is an exit block.
// Such a block may not exist if the nested code produced an infinite
// loop (this may not make sense in production code, but a user could
// write that and we should handle it).
Comment on lines +2300 to +2303
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@kiranchandramohan kiranchandramohan Jan 18, 2024

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Is it guaranteed that it is only when there is an infinite loop that no exit block exists?
Also who/what inserts the terminator for this case (when there is infinite loop)?

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@kparzysz kparzysz Jan 18, 2024

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We rely on the genEval for the nested code to do its thing. If we consider the nested code (PFT/Evaluation) on its own, it will have a single entry point, and zero or more exit points. If it creates multiple blocks, it will need to create its own branches to facilitate the control flow. After genEval we remove the temporary terminator, then we look at all the blocks created during genEval. We know that everything that is present inside of these blocks was created for the nested code (and not the enclosing construct we're lowering). Terminators for our op haven't been created yet, and they can only placed in blocks that don't yet have a terminator. If every block has a terminator then there is no way to leave the region by means of reaching the end of it (that is aside from function calls).

Based on that, the logical thing to do would be to insert a terminator into all non-terminated blocks. This would work even if there is always at most one such block.

The assertion that there can only be one comes mostly from two things:

  • the requirement from the OpenMP standard that a structured block exits at the bottom of the program text, and
  • the current lowering seems to provide a single FIR location that corresponds to the "bottom".

If we can't be sure that the assertion is correct, we should be able to remove it, and process all exiting blocks.

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@kparzysz kparzysz Jan 18, 2024

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What I'm going to do is to create a unique exiting block: create a new block, and for each yet-unterminated block, will insert a branch to the new one. Then insert the OMP terminator into it, and process the lastprivate in there.

This will get rid of the assertion.

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@kiranchandramohan kiranchandramohan Jan 19, 2024

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OK. Makes sense.

firOpBuilder.setInsertionPoint(term);
if (privatize) {
if (!dsp) {
assert(tempDsp.has_value());
tempDsp->processStep2(op, isLoop);
} else {
if (isLoop && args.size() > 0)
dsp->setLoopIV(converter.getSymbolAddress(*args[0]));
dsp->processStep2(op, isLoop);
}
}
}

firOpBuilder.setInsertionPointAfter(marker);
marker->erase();
}

static void genBodyOfTargetDataOp(
Expand Down Expand Up @@ -3685,14 +3736,14 @@ genOMP(Fortran::lower::AbstractConverter &converter,
// Public functions
//===----------------------------------------------------------------------===//

void Fortran::lower::genOpenMPTerminator(fir::FirOpBuilder &builder,
mlir::Operation *op,
mlir::Location loc) {
mlir::Operation *Fortran::lower::genOpenMPTerminator(fir::FirOpBuilder &builder,
mlir::Operation *op,
mlir::Location loc) {
if (mlir::isa<mlir::omp::WsLoopOp, mlir::omp::ReductionDeclareOp,
mlir::omp::AtomicUpdateOp, mlir::omp::SimdLoopOp>(op))
builder.create<mlir::omp::YieldOp>(loc);
return builder.create<mlir::omp::YieldOp>(loc);
else
builder.create<mlir::omp::TerminatorOp>(loc);
return builder.create<mlir::omp::TerminatorOp>(loc);
}

void Fortran::lower::genOpenMPConstruct(
Expand Down
6 changes: 3 additions & 3 deletions flang/test/Lower/OpenMP/FIR/sections.f90
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Expand Up @@ -126,11 +126,11 @@ subroutine lastprivate()
x = x * 10
!CHECK: omp.section {
!CHECK: %[[PRIVATE_X:.*]] = fir.alloca i32 {bindc_name = "x", pinned, uniq_name = "_QFlastprivateEx"}
!CHECK: %[[true:.*]] = arith.constant true
!CHECK: %[[temp:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: %[[const:.*]] = arith.constant 1 : i32
!CHECK: %[[result:.*]] = arith.addi %[[temp]], %[[const]] : i32
!CHECK: fir.store %[[result]] to %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: %[[true:.*]] = arith.constant true
!CHECK: fir.if %[[true]] {
!CHECK: %[[temp:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: fir.store %[[temp]] to %[[X]] : !fir.ref<i32>
Expand Down Expand Up @@ -163,11 +163,11 @@ subroutine lastprivate()
!CHECK: %[[temp:.*]] = fir.load %[[X]] : !fir.ref<i32>
!CHECK: fir.store %[[temp]] to %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: omp.barrier
!CHECK: %[[true:.*]] = arith.constant true
!CHECK: %[[temp:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: %[[const:.*]] = arith.constant 1 : i32
!CHECK: %[[result:.*]] = arith.addi %[[temp]], %[[const]] : i32
!CHECK: fir.store %[[result]] to %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: %[[true:.*]] = arith.constant true
!CHECK: fir.if %true {
!CHECK: %[[temp:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: fir.store %[[temp]] to %[[X]] : !fir.ref<i32>
Expand Down Expand Up @@ -200,11 +200,11 @@ subroutine lastprivate()
!CHECK: %[[temp:.*]] = fir.load %[[X]] : !fir.ref<i32>
!CHECK: fir.store %[[temp]] to %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: omp.barrier
!CHECK: %[[true:.*]] = arith.constant true
!CHECK: %[[temp:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: %[[const:.*]] = arith.constant 1 : i32
!CHECK: %[[result:.*]] = arith.addi %[[temp]], %[[const]] : i32
!CHECK: fir.store %[[result]] to %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: %[[true:.*]] = arith.constant true
!CHECK: fir.if %true {
!CHECK: %[[temp:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<i32>
!CHECK: fir.store %[[temp]] to %[[X]] : !fir.ref<i32>
Expand Down
26 changes: 26 additions & 0 deletions flang/test/Lower/OpenMP/infinite-loop-in-construct.f90
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@@ -0,0 +1,26 @@
! RUN: bbc -fopenmp -o - %s | FileCheck %s

! Check that this test can be lowered successfully.
! See https://github.com/llvm/llvm-project/issues/74348

! CHECK-LABEL: func.func @_QPsb
! CHECK: omp.parallel
! CHECK: cf.cond_br %{{[0-9]+}}, ^bb1, ^bb2
! CHECK-NEXT: ^bb1: // pred: ^bb0
! CHECK: cf.br ^bb2
! CHECK-NEXT: ^bb2: // 3 preds: ^bb0, ^bb1, ^bb2
! CHECK-NEXT: cf.br ^bb2
! CHECK-NEXT: }

subroutine sb(ninter, numnod)
integer :: ninter, numnod
integer, dimension(:), allocatable :: indx_nm

!$omp parallel
if (ninter>0) then
allocate(indx_nm(numnod))
endif
220 continue
goto 220
!$omp end parallel
end subroutine
6 changes: 3 additions & 3 deletions flang/test/Lower/OpenMP/sections.f90
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Expand Up @@ -141,11 +141,11 @@ subroutine lastprivate()
!CHECK: omp.section {
!CHECK: %[[PRIVATE_X:.*]] = fir.alloca i32 {bindc_name = "x", pinned, uniq_name = "_QFlastprivateEx"}
!CHECK: %[[PRIVATE_X_DECL:.*]]:2 = hlfir.declare %[[PRIVATE_X]] {uniq_name = "_QFlastprivateEx"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
!CHECK: %[[TRUE:.*]] = arith.constant true
!CHECK: %[[TEMP:.*]] = fir.load %[[PRIVATE_X_DECL]]#0 : !fir.ref<i32>
!CHECK: %[[CONST:.*]] = arith.constant 1 : i32
!CHECK: %[[RESULT:.*]] = arith.addi %[[TEMP]], %[[CONST]] : i32
!CHECK: hlfir.assign %[[RESULT]] to %[[PRIVATE_X_DECL]]#0 : i32, !fir.ref<i32>
!CHECK: %[[TRUE:.*]] = arith.constant true
!CHECK: fir.if %[[TRUE]] {
!CHECK: %[[TEMP1:.*]] = fir.load %[[PRIVATE_X_DECL]]#0 : !fir.ref<i32>
!CHECK: hlfir.assign %[[TEMP1]] to %[[X_DECL]]#0 temporary_lhs : i32, !fir.ref<i32>
Expand Down Expand Up @@ -180,11 +180,11 @@ subroutine lastprivate()
!CHECK: %[[TEMP:.*]] = fir.load %[[X_DECL]]#0 : !fir.ref<i32>
!CHECK: hlfir.assign %[[TEMP]] to %[[PRIVATE_X_DECL]]#0 temporary_lhs : i32, !fir.ref<i32>
!CHECK: omp.barrier
!CHECK: %[[TRUE:.*]] = arith.constant true
!CHECK: %[[TEMP:.*]] = fir.load %[[PRIVATE_X_DECL]]#0 : !fir.ref<i32>
!CHECK: %[[CONST:.*]] = arith.constant 1 : i32
!CHECK: %[[RESULT:.*]] = arith.addi %[[TEMP]], %[[CONST]] : i32
!CHECK: hlfir.assign %[[RESULT]] to %[[PRIVATE_X_DECL]]#0 : i32, !fir.ref<i32>
!CHECK: %[[TRUE:.*]] = arith.constant true
!CHECK: fir.if %[[TRUE]] {
!CHECK: %[[TEMP:.*]] = fir.load %[[PRIVATE_X_DECL]]#0 : !fir.ref<i32>
!CHECK: hlfir.assign %[[TEMP]] to %[[X_DECL]]#0 temporary_lhs : i32, !fir.ref<i32>
Expand Down Expand Up @@ -219,11 +219,11 @@ subroutine lastprivate()
!CHECK: %[[TEMP:.*]] = fir.load %[[X_DECL]]#0 : !fir.ref<i32>
!CHECK: hlfir.assign %[[TEMP]] to %[[PRIVATE_X_DECL]]#0 temporary_lhs : i32, !fir.ref<i32>
!CHECK: omp.barrier
!CHECK: %[[TRUE:.*]] = arith.constant true
!CHECK: %[[TEMP:.*]] = fir.load %[[PRIVATE_X_DECL]]#0 : !fir.ref<i32>
!CHECK: %[[CONST:.*]] = arith.constant 1 : i32
!CHECK: %[[RESULT:.*]] = arith.addi %[[TEMP]], %[[CONST]] : i32
!CHECK: hlfir.assign %[[RESULT]] to %[[PRIVATE_X_DECL]]#0 : i32, !fir.ref<i32>
!CHECK: %[[TRUE:.*]] = arith.constant true
!CHECK: fir.if %[[TRUE]] {
!CHECK: %[[TEMP:.*]] = fir.load %[[PRIVATE_X_DECL]]#0 : !fir.ref<i32>
!CHECK: hlfir.assign %[[TEMP]] to %[[X_DECL]]#0 temporary_lhs : i32, !fir.ref<i32>
Expand Down
61 changes: 61 additions & 0 deletions flang/test/Lower/OpenMP/wsloop-unstructured.f90
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Original file line number Diff line number Diff line change
@@ -0,0 +1,61 @@
! RUN: bbc -emit-hlfir -fopenmp -o - %s | FileCheck %s

subroutine sub(imax, jmax, x, y)
integer, intent(in) :: imax, jmax
real, intent(in), dimension(1:imax, 1:jmax) :: x, y

integer :: i, j, ii

! collapse(2) is needed to reproduce the issue
!$omp parallel do collapse(2)
do j = 1, jmax
do i = 1, imax
do ii = 1, imax ! note that this loop is not collapsed
if (x(i,j) < y(ii,j)) then
! exit needed to force unstructured control flow
exit
endif
enddo
enddo
enddo
end subroutine sub

! this is testing that we don't crash generating code for this: in particular
! that all blocks are terminated

! CHECK-LABEL: func.func @_QPsub(
! CHECK-SAME: %[[VAL_0:.*]]: !fir.ref<i32> {fir.bindc_name = "imax"},
! CHECK-SAME: %[[VAL_1:.*]]: !fir.ref<i32> {fir.bindc_name = "jmax"},
! CHECK-SAME: %[[VAL_2:.*]]: !fir.ref<!fir.array<?x?xf32>> {fir.bindc_name = "x"},
! CHECK-SAME: %[[VAL_3:.*]]: !fir.ref<!fir.array<?x?xf32>> {fir.bindc_name = "y"}) {
! [...]
! CHECK: omp.wsloop for (%[[VAL_53:.*]], %[[VAL_54:.*]]) : i32 = ({{.*}}) to ({{.*}}) inclusive step ({{.*}}) {
! [...]
! CHECK: cf.br ^bb1
! CHECK: ^bb1:
! CHECK: cf.br ^bb2
! CHECK: ^bb2:
! [...]
! CHECK: cf.br ^bb3
! CHECK: ^bb3:
! [...]
! CHECK: %[[VAL_63:.*]] = arith.cmpi sgt, %{{.*}}, %{{.*}} : i32
! CHECK: cf.cond_br %[[VAL_63]], ^bb4, ^bb7
! CHECK: ^bb4:
! [...]
! CHECK: %[[VAL_76:.*]] = arith.cmpf olt, %{{.*}}, %{{.*}} fastmath<contract> : f32
! CHECK: cf.cond_br %[[VAL_76]], ^bb5, ^bb6
! CHECK: ^bb5:
! CHECK: cf.br ^bb7
! CHECK: ^bb6:
! [...]
! CHECK: cf.br ^bb3
! CHECK: ^bb7:
! CHECK: omp.yield
! CHECK: }
! CHECK: omp.terminator
! CHECK: }
! CHECK: cf.br ^bb1
! CHECK: ^bb1:
! CHECK: return
! CHECK: }