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[flang][cuda] Lower clock64 to nvvm intrinsic #127155

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Merged
merged 1 commit into from
Feb 14, 2025
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[flang][cuda] Lower clock64 to nvvm intrinsic #127155

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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 @@ -231,6 +231,7 @@ struct IntrinsicLibrary {
void genCFProcPointer(llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genCFunLoc(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genCLoc(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
mlir::Value genClock64(mlir::Type, llvm::ArrayRef<mlir::Value>);
template <mlir::arith::CmpIPredicate pred>
fir::ExtendedValue genCPtrCompare(mlir::Type,
llvm::ArrayRef<fir::ExtendedValue>);
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11 changes: 11 additions & 0 deletions flang/lib/Optimizer/Builder/IntrinsicCall.cpp
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Expand Up @@ -209,6 +209,7 @@ static constexpr IntrinsicHandler handlers[]{
&I::genChdir,
{{{"name", asAddr}, {"status", asAddr, handleDynamicOptional}}},
/*isElemental=*/false},
{"clock64", &I::genClock64, {}, /*isElemental=*/false},
{"cmplx",
&I::genCmplx,
{{{"x", asValue}, {"y", asValue, handleDynamicOptional}}}},
Expand Down Expand Up @@ -3228,6 +3229,16 @@ IntrinsicLibrary::genChdir(std::optional<mlir::Type> resultType,
return {};
}

// CLOCK64
mlir::Value IntrinsicLibrary::genClock64(mlir::Type resultType,
llvm::ArrayRef<mlir::Value> args) {
constexpr llvm::StringLiteral funcName = "llvm.nvvm.read.ptx.sreg.clock64";
mlir::MLIRContext *context = builder.getContext();
mlir::FunctionType ftype = mlir::FunctionType::get(context, {}, {resultType});
auto funcOp = builder.createFunction(loc, funcName, ftype);
return builder.create<fir::CallOp>(loc, funcOp, args).getResult(0);
}

// CMPLX
mlir::Value IntrinsicLibrary::genCmplx(mlir::Type resultType,
llvm::ArrayRef<mlir::Value> args) {
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5 changes: 5 additions & 0 deletions flang/module/cudadevice.f90
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Expand Up @@ -628,5 +628,10 @@ attributes(device) pure integer function atomicdeci(address, val)
end interface
public :: atomicdec

interface
attributes(device) integer(8) function clock64()
end function
end interface
public :: clock64

end module
5 changes: 5 additions & 0 deletions flang/test/Lower/CUDA/cuda-device-proc.cuf
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Expand Up @@ -9,6 +9,7 @@ attributes(global) subroutine devsub()
real(8) :: ad
integer(4) :: ai
integer(8) :: al
integer(8) :: time

call syncthreads()
call syncwarp(1)
Expand Down Expand Up @@ -43,6 +44,8 @@ attributes(global) subroutine devsub()
ai = atomicor(ai, 1_4)
ai = atomicinc(ai, 1_4)
ai = atomicdec(ai, 1_4)

time = clock64()
end

! CHECK-LABEL: func.func @_QPdevsub() attributes {cuf.proc_attr = #cuf.cuda_proc<global>}
Expand Down Expand Up @@ -79,6 +82,8 @@ end
! CHECK: %{{.*}} = llvm.atomicrmw uinc_wrap %{{.*}}, %{{.*}} seq_cst : !llvm.ptr, i32
! CHECK: %{{.*}} = llvm.atomicrmw udec_wrap %{{.*}}, %{{.*}} seq_cst : !llvm.ptr, i32

! CHECK: fir.call @llvm.nvvm.read.ptx.sreg.clock64()

subroutine host1()
integer, device :: a(32)
integer, device :: ret
Expand Down