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[flang][cuda] Add interface and lower barrier_init #162929

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Merged
merged 2 commits into from
Oct 10, 2025
Merged

[flang][cuda] Add interface and lower barrier_init #162929

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bc1ee80
[flang][cuda] Add interface and lower barrier_init
clementval Oct 10, 2025
ea8c806
Remove check lines that don't matter
clementval Oct 10, 2025
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1 change: 1 addition & 0 deletions flang/include/flang/Optimizer/Builder/IntrinsicCall.h
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,7 @@ struct IntrinsicLibrary {
fir::ExtendedValue genAssociated(mlir::Type,
llvm::ArrayRef<fir::ExtendedValue>);
mlir::Value genAtand(mlir::Type, llvm::ArrayRef<mlir::Value>);
void genBarrierInit(llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genBesselJn(mlir::Type,
llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genBesselYn(mlir::Type,
Expand Down
20 changes: 20 additions & 0 deletions flang/lib/Optimizer/Builder/IntrinsicCall.cpp
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Expand Up @@ -346,6 +346,10 @@ static constexpr IntrinsicHandler handlers[]{
&I::genVoteSync<mlir::NVVM::VoteSyncKind::ballot>,
{{{"mask", asValue}, {"pred", asValue}}},
/*isElemental=*/false},
{"barrier_init",
&I::genBarrierInit,
{{{"barrier", asAddr}, {"count", asValue}}},
/*isElemental=*/false},
{"bessel_jn",
&I::genBesselJn,
{{{"n1", asValue}, {"n2", asValue}, {"x", asValue}}},
Expand Down Expand Up @@ -3176,6 +3180,22 @@ IntrinsicLibrary::genAssociated(mlir::Type resultType,
return fir::runtime::genAssociated(builder, loc, pointerBox, targetBox);
}

// BARRIER_INIT (CUDA)
void IntrinsicLibrary::genBarrierInit(llvm::ArrayRef<fir::ExtendedValue> args) {
assert(args.size() == 2);
auto llvmPtr = fir::ConvertOp::create(
builder, loc, mlir::LLVM::LLVMPointerType::get(builder.getContext()),
fir::getBase(args[0]));
auto addrCast = mlir::LLVM::AddrSpaceCastOp::create(
builder, loc,
mlir::LLVM::LLVMPointerType::get(
builder.getContext(),
static_cast<unsigned>(mlir::NVVM::NVVMMemorySpace::Shared)),
llvmPtr);
mlir::NVVM::MBarrierInitSharedOp::create(builder, loc, addrCast,
fir::getBase(args[1]), {});
}

// BESSEL_JN
fir::ExtendedValue
IntrinsicLibrary::genBesselJn(mlir::Type resultType,
Expand Down
7 changes: 7 additions & 0 deletions flang/module/cudadevice.f90
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Expand Up @@ -1987,6 +1987,13 @@ attributes(device,host) logical function on_device() bind(c)
end function
end interface

interface
attributes(device) subroutine barrier_init(barrier, count)
integer(8) :: barrier
integer(4) :: count
end subroutine
end interface

contains

attributes(device) subroutine syncthreads()
Expand Down
15 changes: 15 additions & 0 deletions flang/test/Lower/CUDA/cuda-device-proc.cuf
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Expand Up @@ -417,3 +417,18 @@ end subroutine
! CHECK-DAG: func.func private @__ldcs_r8x2_(!fir.ref<!fir.array<2xf64>>, !fir.ref<!fir.array<2xf64>>)
! CHECK-DAG: func.func private @__ldlu_r8x2_(!fir.ref<!fir.array<2xf64>>, !fir.ref<!fir.array<2xf64>>)
! CHECK-DAG: func.func private @__ldcv_r8x2_(!fir.ref<!fir.array<2xf64>>, !fir.ref<!fir.array<2xf64>>)

attributes(global) subroutine test_barrier()
integer(8), shared :: barrier
call barrier_init(barrier, 256)
end subroutine


! CHECK-LABEL: func.func @_QPtest_barrier()

! CHECK: %[[SHARED:.*]] = cuf.shared_memory i64 {bindc_name = "barrier", uniq_name = "_QFtest_barrierEbarrier"} -> !fir.ref<i64>
! CHECK: %[[DECL_SHARED:.*]]:2 = hlfir.declare %[[SHARED]] {data_attr = #cuf.cuda<shared>, uniq_name = "_QFtest_barrierEbarrier"} : (!fir.ref<i64>) -> (!fir.ref<i64>, !fir.ref<i64>)
! CHECK: %[[COUNT:.*]] = arith.constant 256 : i32
! CHECK: %[[LLVM_PTR:.*]] = fir.convert %[[DECL_SHARED]]#0 : (!fir.ref<i64>) -> !llvm.ptr
! CHECK: %[[SHARED_PTR:.*]] = llvm.addrspacecast %[[LLVM_PTR]] : !llvm.ptr to !llvm.ptr<3>
! CHECK: nvvm.mbarrier.init.shared %[[SHARED_PTR]], %[[COUNT]] : !llvm.ptr<3>, i32
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