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Differential D121841

[flang] Lower array related intrinsics
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Authored by clementval on Mar 16 2022, 1:01 PM.

Details

Reviewers
jeanPerier
PeteSteinfeld
schweitz
svedanayagam
klausler
Commits
rGeea7c935d296: [flang] Lower array related intrinsics
Summary

This patch adds lowering for somw array related intrinsics:

  • reshape
  • spread

This patch is part of the upstreaming effort from fir-dev branch.

Diff Detail

Event Timeline

clementval created this revision.Mar 16 2022, 1:01 PM
Herald added projects: Restricted Project, Restricted Project. · View Herald TranscriptMar 16 2022, 1:01 PM
Herald added a subscriber: mehdi_amini. · View Herald Transcript
clementval requested review of this revision.Mar 16 2022, 1:01 PM
Herald added a subscriber: jdoerfert. · View Herald TranscriptMar 16 2022, 1:01 PM
Harbormaster completed remote builds in B154679: Diff 415948.Mar 16 2022, 1:21 PM
schweitz accepted this revision.Mar 16 2022, 3:28 PM
This revision is now accepted and ready to land.Mar 16 2022, 3:28 PM
Closed by commit rGeea7c935d296: [flang] Lower array related intrinsics (authored by clementval). · Explain WhyMar 16 2022, 11:22 PM
This revision was automatically updated to reflect the committed changes.
clementval added a commit: rGeea7c935d296: [flang] Lower array related intrinsics.

Revision Contents

PathSize
flang/
lib/
Lower/
91 lines
test/
Lower/
Intrinsics/
56 lines
39 lines

Diff 416073

flang/lib/Lower/IntrinsicCall.cpp

Show First 20 Lines • Show All 480 Lines • ▼ Show 20 Linesstruct IntrinsicLibrary {
mlir::Value genNint(mlir::Type, llvm::ArrayRef<mlir::Value>); mlir::Value genNint(mlir::Type, llvm::ArrayRef<mlir::Value>);
mlir::Value genNot(mlir::Type, llvm::ArrayRef<mlir::Value>); mlir::Value genNot(mlir::Type, llvm::ArrayRef<mlir::Value>);
fir::ExtendedValue genNull(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genNull(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genPack(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genPack(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genProduct(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genProduct(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
void genRandomInit(llvm::ArrayRef<fir::ExtendedValue>); void genRandomInit(llvm::ArrayRef<fir::ExtendedValue>);
void genRandomNumber(llvm::ArrayRef<fir::ExtendedValue>); void genRandomNumber(llvm::ArrayRef<fir::ExtendedValue>);
void genRandomSeed(llvm::ArrayRef<fir::ExtendedValue>); void genRandomSeed(llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genReshape(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genScan(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genScan(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
mlir::Value genSetExponent(mlir::Type resultType, mlir::Value genSetExponent(mlir::Type resultType,
llvm::ArrayRef<mlir::Value> args); llvm::ArrayRef<mlir::Value> args);
fir::ExtendedValue genSize(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genSize(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genSum(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genSum(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genSpread(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
void genSystemClock(llvm::ArrayRef<fir::ExtendedValue>); void genSystemClock(llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genTransfer(mlir::Type, fir::ExtendedValue genTransfer(mlir::Type,
llvm::ArrayRef<fir::ExtendedValue>); llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genUbound(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genUbound(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genUnpack(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genUnpack(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
fir::ExtendedValue genVerify(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>); fir::ExtendedValue genVerify(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
/// Define the different FIR generators that can be mapped to intrinsic to /// Define the different FIR generators that can be mapped to intrinsic to
▲ Show 20 Lines • Show All 222 Lines • ▼ Show 20 Linesstatic constexpr IntrinsicHandler handlers[]{
{"random_number", {"random_number",
&I::genRandomNumber, &I::genRandomNumber,
{{{"harvest", asBox}}}, {{{"harvest", asBox}}},
/*isElemental=*/false}, /*isElemental=*/false},
{"random_seed", {"random_seed",
&I::genRandomSeed, &I::genRandomSeed,
{{{"size", asBox}, {"put", asBox}, {"get", asBox}}}, {{{"size", asBox}, {"put", asBox}, {"get", asBox}}},
/*isElemental=*/false}, /*isElemental=*/false},
{"reshape",
&I::genReshape,
{{{"source", asBox},
{"shape", asBox},
{"pad", asBox, handleDynamicOptional},
{"order", asBox, handleDynamicOptional}}},
/*isElemental=*/false},
{"scan", {"scan",
&I::genScan, &I::genScan,
{{{"string", asAddr}, {{{"string", asAddr},
{"set", asAddr}, {"set", asAddr},
{"back", asValue, handleDynamicOptional}, {"back", asValue, handleDynamicOptional},
{"kind", asValue}}}, {"kind", asValue}}},
/*isElemental=*/true}, /*isElemental=*/true},
{"set_exponent", &I::genSetExponent}, {"set_exponent", &I::genSetExponent},
{"size", {"size",
&I::genSize, &I::genSize,
{{{"array", asBox}, {{{"array", asBox},
{"dim", asAddr, handleDynamicOptional}, {"dim", asAddr, handleDynamicOptional},
{"kind", asValue}}}, {"kind", asValue}}},
/*isElemental=*/false}, /*isElemental=*/false},
{"spread",
&I::genSpread,
{{{"source", asAddr}, {"dim", asValue}, {"ncopies", asValue}}},
/*isElemental=*/false},
{"sum", {"sum",
&I::genSum, &I::genSum,
{{{"array", asBox}, {{{"array", asBox},
{"dim", asValue}, {"dim", asValue},
{"mask", asBox, handleDynamicOptional}}}, {"mask", asBox, handleDynamicOptional}}},
/*isElemental=*/false}, /*isElemental=*/false},
{"system_clock", {"system_clock",
&I::genSystemClock, &I::genSystemClock,
▲ Show 20 Lines • Show All 1,742 Lines • ▼ Show 20 Linesvoid IntrinsicLibrary::genRandomSeed(llvm::ArrayRef<fir::ExtendedValue> args) {
for (int i = 0; i < 3; ++i) for (int i = 0; i < 3; ++i)
if (isPresent(args[i])) { if (isPresent(args[i])) {
Fortran::lower::genRandomSeed(builder, loc, i, fir::getBase(args[i])); Fortran::lower::genRandomSeed(builder, loc, i, fir::getBase(args[i]));
return; return;
} }
Fortran::lower::genRandomSeed(builder, loc, -1, mlir::Value{}); Fortran::lower::genRandomSeed(builder, loc, -1, mlir::Value{});
} }
// RESHAPE
fir::ExtendedValue
IntrinsicLibrary::genReshape(mlir::Type resultType,
llvm::ArrayRef<fir::ExtendedValue> args) {
assert(args.size() == 4);
// Handle source argument
mlir::Value source = builder.createBox(loc, args[0]);
// Handle shape argument
mlir::Value shape = builder.createBox(loc, args[1]);
assert(fir::BoxValue(shape).rank() == 1);
mlir::Type shapeTy = shape.getType();
mlir::Type shapeArrTy = fir::dyn_cast_ptrOrBoxEleTy(shapeTy);
auto resultRank = shapeArrTy.cast<fir::SequenceType>().getShape();
assert(resultRank[0] != fir::SequenceType::getUnknownExtent() &&
"shape arg must have constant size");
// Handle optional pad argument
mlir::Value pad = isAbsent(args[2])
? builder.create<fir::AbsentOp>(
loc, fir::BoxType::get(builder.getI1Type()))
: builder.createBox(loc, args[2]);
// Handle optional order argument
mlir::Value order = isAbsent(args[3])
? builder.create<fir::AbsentOp>(
loc, fir::BoxType::get(builder.getI1Type()))
: builder.createBox(loc, args[3]);
// Create mutable fir.box to be passed to the runtime for the result.
mlir::Type type = builder.getVarLenSeqTy(resultType, resultRank[0]);
fir::MutableBoxValue resultMutableBox =
fir::factory::createTempMutableBox(builder, loc, type);
mlir::Value resultIrBox =
fir::factory::getMutableIRBox(builder, loc, resultMutableBox);
fir::runtime::genReshape(builder, loc, resultIrBox, source, shape, pad,
order);
return readAndAddCleanUp(resultMutableBox, resultType,
"unexpected result for RESHAPE");
}
// SCAN // SCAN
fir::ExtendedValue fir::ExtendedValue
IntrinsicLibrary::genScan(mlir::Type resultType, IntrinsicLibrary::genScan(mlir::Type resultType,
llvm::ArrayRef<fir::ExtendedValue> args) { llvm::ArrayRef<fir::ExtendedValue> args) {
assert(args.size() == 4); assert(args.size() == 4);
if (isAbsent(args[3])) { if (isAbsent(args[3])) {
▲ Show 20 Lines • Show All 72 Lines • ▼ Show 20 Linesmlir::Value IntrinsicLibrary::genSetExponent(mlir::Type resultType,
assert(args.size() == 2); assert(args.size() == 2);
return builder.createConvert( return builder.createConvert(
loc, resultType, loc, resultType,
fir::runtime::genSetExponent(builder, loc, fir::getBase(args[0]), fir::runtime::genSetExponent(builder, loc, fir::getBase(args[0]),
fir::getBase(args[1]))); fir::getBase(args[1])));
} }
// SPREAD
fir::ExtendedValue
IntrinsicLibrary::genSpread(mlir::Type resultType,
llvm::ArrayRef<fir::ExtendedValue> args) {
assert(args.size() == 3);
// Handle source argument
mlir::Value source = builder.createBox(loc, args[0]);
fir::BoxValue sourceTmp = source;
unsigned sourceRank = sourceTmp.rank();
// Handle Dim argument
mlir::Value dim = fir::getBase(args[1]);
// Handle ncopies argument
mlir::Value ncopies = fir::getBase(args[2]);
// Generate result descriptor
mlir::Type resultArrayType =
builder.getVarLenSeqTy(resultType, sourceRank + 1);
fir::MutableBoxValue resultMutableBox =
fir::factory::createTempMutableBox(builder, loc, resultArrayType);
mlir::Value resultIrBox =
fir::factory::getMutableIRBox(builder, loc, resultMutableBox);
fir::runtime::genSpread(builder, loc, resultIrBox, source, dim, ncopies);
return readAndAddCleanUp(resultMutableBox, resultType,
"unexpected result for SPREAD");
}
// SUM // SUM
fir::ExtendedValue fir::ExtendedValue
IntrinsicLibrary::genSum(mlir::Type resultType, IntrinsicLibrary::genSum(mlir::Type resultType,
llvm::ArrayRef<fir::ExtendedValue> args) { llvm::ArrayRef<fir::ExtendedValue> args) {
return genProdOrSum(fir::runtime::genSum, fir::runtime::genSumDim, resultType, return genProdOrSum(fir::runtime::genSum, fir::runtime::genSumDim, resultType,
builder, loc, stmtCtx, "unexpected result for Sum", args); builder, loc, stmtCtx, "unexpected result for Sum", args);
} }
▲ Show 20 Lines • Show All 337 Lines • Show Last 20 Lines

flang/test/Lower/Intrinsics/reshape.f90

  • This file was added.
! RUN: bbc -emit-fir %s -o - | FileCheck %s
! CHECK-LABEL: func @_QPreshape_test(
! CHECK-SAME: %[[arg0:.*]]: !fir.box<!fir.array<?x?xi32>>{{.*}}, %[[arg1:[^:]+]]: !fir.box<!fir.array<?x?x?xi32>>{{.*}}, %[[arg2:[^:]+]]: !fir.box<!fir.array<?x?x?xi32>>{{.*}}, %[[arg3:.*]]: !fir.ref<!fir.array<2xi32>>{{.*}}, %[[arg4:.*]]: !fir.ref<!fir.array<2xi32>>{{.*}}) {
subroutine reshape_test(x, source, pd, sh, ord)
integer :: x(:,:)
integer :: source(:,:,:)
integer :: pd(:,:,:)
integer :: sh(2)
integer :: ord(2)
! CHECK-DAG: %[[c2:.*]] = arith.constant 2 : index
! CHECK-DAG: %[[a0:.*]] = fir.alloca !fir.box<!fir.heap<!fir.array<?x?xi32>>>
! CHECK-DAG: %[[a1:.*]] = fir.shape %[[c2]] : (index) -> !fir.shape<1>
! CHECK-DAG: %[[a2:.*]] = fir.embox %[[arg3]](%{{.*}}) : (!fir.ref<!fir.array<2xi32>>, !fir.shape<1>) -> !fir.box<!fir.array<2xi32>>
! CHECK-DAG: %[[a3:.*]] = fir.embox %[[arg4]](%{{.*}}) : (!fir.ref<!fir.array<2xi32>>, !fir.shape<1>) -> !fir.box<!fir.array<2xi32>>
! CHECK-DAG: %[[a8:.*]] = fir.convert %[[a0]] : (!fir.ref<!fir.box<!fir.heap<!fir.array<?x?xi32>>>>) -> !fir.ref<!fir.box<none>>
! CHECK-DAG: %[[a9:.*]] = fir.convert %[[arg1]] : (!fir.box<!fir.array<?x?x?xi32>>) -> !fir.box<none>
! CHECK-DAG: %[[a10:.*]] = fir.convert %[[a2]] : (!fir.box<!fir.array<2xi32>>) -> !fir.box<none>
! CHECK-DAG: %[[a11:.*]] = fir.convert %[[arg2]] : (!fir.box<!fir.array<?x?x?xi32>>) -> !fir.box<none>
! CHECK-DAG: %[[a12:.*]] = fir.convert %[[a3]] : (!fir.box<!fir.array<2xi32>>) -> !fir.box<none>
x = reshape(source, sh, pd, ord)
! CHECK: %{{.*}} = fir.call @_FortranAReshape(%[[a8]], %[[a9]], %[[a10]], %[[a11]], %[[a12]], %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.box<none>, !fir.box<none>, !fir.box<none>, !fir.box<none>, !fir.ref<i8>, i32) -> none
! CHECK-DAG: %[[a15:.*]] = fir.load %[[a0]] : !fir.ref<!fir.box<!fir.heap<!fir.array<?x?xi32>>>>
! CHECK-DAG: %[[a18:.*]] = fir.box_addr %[[a15]] : (!fir.box<!fir.heap<!fir.array<?x?xi32>>>) -> !fir.heap<!fir.array<?x?xi32>>
! CHECK-DAG: fir.freemem %[[a18]]
end subroutine
! CHECK-LABEL: func @_QPtest_reshape_optional(
! CHECK-SAME: %[[VAL_0:.*]]: !fir.ref<!fir.box<!fir.ptr<!fir.array<?x?xf32>>>>
! CHECK-SAME: %[[VAL_1:.*]]: !fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>
subroutine test_reshape_optional(pad, order, source, shape)
real, pointer :: pad(:, :)
integer, pointer :: order(:)
real :: source(:, :, :)
integer :: shape(4)
print *, reshape(source=source, shape=shape, pad=pad, order=order)
! CHECK: %[[VAL_13:.*]] = fir.load %[[VAL_0]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?x?xf32>>>>
! CHECK: %[[VAL_14:.*]] = fir.box_addr %[[VAL_13]] : (!fir.box<!fir.ptr<!fir.array<?x?xf32>>>) -> !fir.ptr<!fir.array<?x?xf32>>
! CHECK: %[[VAL_15:.*]] = fir.convert %[[VAL_14]] : (!fir.ptr<!fir.array<?x?xf32>>) -> i64
! CHECK: %[[VAL_16:.*]] = arith.constant 0 : i64
! CHECK: %[[VAL_17:.*]] = arith.cmpi ne, %[[VAL_15]], %[[VAL_16]] : i64
! CHECK: %[[VAL_18:.*]] = fir.load %[[VAL_0]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?x?xf32>>>>
! CHECK: %[[VAL_19:.*]] = fir.absent !fir.box<!fir.ptr<!fir.array<?x?xf32>>>
! CHECK: %[[VAL_20:.*]] = arith.select %[[VAL_17]], %[[VAL_18]], %[[VAL_19]] : !fir.box<!fir.ptr<!fir.array<?x?xf32>>>
! CHECK: %[[VAL_21:.*]] = fir.load %[[VAL_1]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>
! CHECK: %[[VAL_22:.*]] = fir.box_addr %[[VAL_21]] : (!fir.box<!fir.ptr<!fir.array<?xi32>>>) -> !fir.ptr<!fir.array<?xi32>>
! CHECK: %[[VAL_23:.*]] = fir.convert %[[VAL_22]] : (!fir.ptr<!fir.array<?xi32>>) -> i64
! CHECK: %[[VAL_24:.*]] = arith.constant 0 : i64
! CHECK: %[[VAL_25:.*]] = arith.cmpi ne, %[[VAL_23]], %[[VAL_24]] : i64
! CHECK: %[[VAL_26:.*]] = fir.load %[[VAL_1]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?xi32>>>>
! CHECK: %[[VAL_27:.*]] = fir.absent !fir.box<!fir.ptr<!fir.array<?xi32>>>
! CHECK: %[[VAL_28:.*]] = arith.select %[[VAL_25]], %[[VAL_26]], %[[VAL_27]] : !fir.box<!fir.ptr<!fir.array<?xi32>>>
! CHECK: %[[VAL_38:.*]] = fir.convert %[[VAL_20]] : (!fir.box<!fir.ptr<!fir.array<?x?xf32>>>) -> !fir.box<none>
! CHECK: %[[VAL_39:.*]] = fir.convert %[[VAL_28]] : (!fir.box<!fir.ptr<!fir.array<?xi32>>>) -> !fir.box<none>
! CHECK: %[[VAL_41:.*]] = fir.call @_FortranAReshape({{.*}}, {{.*}}, %{{.*}}, %[[VAL_38]], %[[VAL_39]], %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.box<none>, !fir.box<none>, !fir.box<none>, !fir.box<none>, !fir.ref<i8>, i32) -> none
end subroutine

flang/test/Lower/Intrinsics/spread.f90

  • This file was added.
! RUN: bbc -emit-fir %s -o - | FileCheck %s
! CHECK-LABEL: func @_QPspread_test(
! CHECK-SAME: %[[arg0:[^:]+]]: !fir.ref<i32>{{.*}}, %[[arg1:[^:]+]]: !fir.ref<i32>{{.*}}, %[[arg2:[^:]+]]: !fir.ref<i32>{{.*}}, %[[arg3:.*]]: !fir.box<!fir.array<?xi32>>{{.*}}) {
subroutine spread_test(s,d,n,r)
integer :: s,d,n
integer :: r(:)
! CHECK-DAG: %[[a0:.*]] = fir.alloca !fir.box<!fir.heap<!fir.array<?xi32>>>
! CHECK-DAG: %[[a1:.*]] = fir.load %[[arg1]] : !fir.ref<i32>
! CHECK-DAG: %[[a2:.*]] = fir.load %[[arg2]] : !fir.ref<i32>
! CHECK-DAG: %[[a3:.*]] = fir.embox %[[arg0]] : (!fir.ref<i32>) -> !fir.box<i32>
! CHECK-DAG: %[[a8:.*]] = fir.convert %[[a0]] : (!fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>) -> !fir.ref<!fir.box<none>>
! CHECK-DAG: %[[a9:.*]] = fir.convert %[[a3]] : (!fir.box<i32>) -> !fir.box<none>
! CHECK-DAG: %[[a10:.*]] = fir.convert %[[a2]] : (i32) -> i64
r = spread(s,d,n)
! CHECK: %{{.*}} = fir.call @_FortranASpread(%[[a8]], %[[a9]], %[[a1]], %[[a10]], %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.box<none>, i32, i64, !fir.ref<i8>, i32) -> none
! CHECK-DAG: %[[a13:.*]] = fir.load %[[a0]] : !fir.ref<!fir.box<!fir.heap<!fir.array<?xi32>>>>
! CHECK-DAG: %[[a15:.*]] = fir.box_addr %[[a13]] : (!fir.box<!fir.heap<!fir.array<?xi32>>>) -> !fir.heap<!fir.array<?xi32>>
! CHECK: fir.freemem %[[a15]]
end subroutine
! CHECK-LABEL: func @_QPspread_test2(
! CHECK-SAME: %[[arg0:.*]]: !fir.box<!fir.array<?xi32>>{{.*}}, %[[arg1:[^:]+]]: !fir.ref<i32>{{.*}}, %[[arg2:[^:]+]]: !fir.ref<i32>{{.*}}, %[[arg3:.*]]: !fir.box<!fir.array<?x?xi32>>{{.*}}) {
subroutine spread_test2(s,d,n,r)
integer :: s(:),d,n
integer :: r(:,:)
! CHECK-DAG: %[[a0:.*]] = fir.alloca !fir.box<!fir.heap<!fir.array<?x?xi32>>>
! CHECK-DAG: %[[a1:.*]] = fir.load %[[arg1]] : !fir.ref<i32>
! CHECK-DAG: %[[a2:.*]] = fir.load %[[arg2]] : !fir.ref<i32>
! CHECK-DAG: %[[a7:.*]] = fir.convert %[[a0]] : (!fir.ref<!fir.box<!fir.heap<!fir.array<?x?xi32>>>>) -> !fir.ref<!fir.box<none>>
! CHECK-DAG: %[[a8:.*]] = fir.convert %[[arg0]] : (!fir.box<!fir.array<?xi32>>) -> !fir.box<none>
! CHECK-DAG: %[[a9:.*]] = fir.convert %[[a2]] : (i32) -> i64
r = spread(s,d,n)
! CHECK: %{{.*}} = fir.call @_FortranASpread(%[[a7]], %[[a8]], %[[a1]], %[[a9]], %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.box<none>, i32, i64, !fir.ref<i8>, i32) -> none
! CHECK-DAG: %[[a12:.*]] = fir.load %[[a0]] : !fir.ref<!fir.box<!fir.heap<!fir.array<?x?xi32>>>>
! CHECK-DAG: %[[a15:.*]] = fir.box_addr %[[a12]] : (!fir.box<!fir.heap<!fir.array<?x?xi32>>>) -> !fir.heap<!fir.array<?x?xi32>>
! CHECK: fir.freemem %[[a15:.*]]
end subroutine
No newline at end of file