[Flang][OpenMP] - Fix the mapping flags used on descriptors mapped by MapsForPrivatizedSymbolsPass#167554
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bhandarkar-pranav merged 2 commits intollvm:mainfrom Nov 12, 2025
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… MapsForPrivatizedSymbolsPass The descriptors of a variable that has been privatized should be mapped `tofrom` instead of `to`.
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@llvm/pr-subscribers-flang-openmp @llvm/pr-subscribers-flang-fir-hlfir Author: Pranav Bhandarkar (bhandarkar-pranav) ChangesThe descriptors of a variable that has been privatized should be mapped Full diff: https://github.com/llvm/llvm-project/pull/167554.diff 4 Files Affected:
diff --git a/flang/lib/Optimizer/OpenMP/MapsForPrivatizedSymbols.cpp b/flang/lib/Optimizer/OpenMP/MapsForPrivatizedSymbols.cpp
index 0972861b8450a..6404e1892ca5d 100644
--- a/flang/lib/Optimizer/OpenMP/MapsForPrivatizedSymbols.cpp
+++ b/flang/lib/Optimizer/OpenMP/MapsForPrivatizedSymbols.cpp
@@ -104,21 +104,31 @@ class MapsForPrivatizedSymbolsPass
llvm::SmallVector<mlir::Value> boundsOps;
if (needsBoundsOps(varPtr))
genBoundsOps(builder, varPtr, boundsOps);
+ mlir::Type varType = varPtr.getType();
mlir::omp::VariableCaptureKind captureKind =
mlir::omp::VariableCaptureKind::ByRef;
- if (fir::isa_trivial(fir::unwrapRefType(varPtr.getType())) ||
- fir::isa_char(fir::unwrapRefType(varPtr.getType()))) {
- if (canPassByValue(fir::unwrapRefType(varPtr.getType()))) {
+ if (fir::isa_trivial(fir::unwrapRefType(varType)) ||
+ fir::isa_char(fir::unwrapRefType(varType))) {
+ if (canPassByValue(fir::unwrapRefType(varType))) {
captureKind = mlir::omp::VariableCaptureKind::ByCopy;
}
}
+ // Use tofrom if what we are mapping is not a trivial type. In all
+ // likelihood, it is a descriptor
+ mlir::omp::ClauseMapFlags mapFlag;
+ if (fir::isa_trivial(fir::unwrapRefType(varType)) ||
+ fir::isa_char(fir::unwrapRefType(varType)))
+ mapFlag = mlir::omp::ClauseMapFlags::to;
+ else
+ mapFlag = mlir::omp::ClauseMapFlags::to | mlir::omp::ClauseMapFlags::from;
+
return omp::MapInfoOp::create(
- builder, loc, varPtr.getType(), varPtr,
- TypeAttr::get(llvm::cast<omp::PointerLikeType>(varPtr.getType())
- .getElementType()),
- builder.getAttr<omp::ClauseMapFlagsAttr>(omp::ClauseMapFlags::to),
+ builder, loc, varType, varPtr,
+ TypeAttr::get(
+ llvm::cast<omp::PointerLikeType>(varType).getElementType()),
+ builder.getAttr<omp::ClauseMapFlagsAttr>(mapFlag),
builder.getAttr<omp::VariableCaptureKindAttr>(captureKind),
/*varPtrPtr=*/Value{},
/*members=*/SmallVector<Value>{},
diff --git a/flang/test/Lower/OpenMP/DelayedPrivatization/target-private-allocatable.f90 b/flang/test/Lower/OpenMP/DelayedPrivatization/target-private-allocatable.f90
index 272f34fc0fd1a..cfe42367b051b 100644
--- a/flang/test/Lower/OpenMP/DelayedPrivatization/target-private-allocatable.f90
+++ b/flang/test/Lower/OpenMP/DelayedPrivatization/target-private-allocatable.f90
@@ -72,7 +72,7 @@ end subroutine target_allocatable
! CPU-SAME: {bindc_name = "alloc_var", {{.*}}}
! CPU: %[[VAR_DECL:.*]]:2 = hlfir.declare %[[VAR_ALLOC]]
! CPU: %[[BASE_ADDR:.*]] = fir.box_offset %[[VAR_DECL]]#0 base_addr : (!fir.ref<!fir.box<!fir.heap<i32>>>) -> [[MEMBER_TYPE:.*]]
-! CPU: %[[MEMBER:.*]] = omp.map.info var_ptr(%[[VAR_DECL]]#0 : [[TYPE]], i32) map_clauses(to) capture(ByRef) var_ptr_ptr(%[[BASE_ADDR]] : [[MEMBER_TYPE:.*]]) -> {{.*}}
+! CPU: %[[MEMBER:.*]] = omp.map.info var_ptr(%[[VAR_DECL]]#0 : [[TYPE]], i32) map_clauses(tofrom) capture(ByRef) var_ptr_ptr(%[[BASE_ADDR]] : [[MEMBER_TYPE:.*]]) -> {{.*}}
! CPU: %[[MAP_VAR:.*]] = omp.map.info var_ptr(%[[VAR_DECL]]#0 : [[TYPE]], [[DESC_TYPE]]) map_clauses(to) capture(ByRef) members(%[[MEMBER]] : [0] : !fir.llvm_ptr<!fir.ref<i32>>) -> !fir.ref<!fir.box<!fir.heap<i32>>>
! CPU: omp.target map_entries(%[[MAP_VAR]] -> %arg0, %[[MEMBER]] -> %arg1 : [[TYPE]], [[MEMBER_TYPE]]) private(
diff --git a/flang/test/Lower/OpenMP/optional-argument-map-2.f90 b/flang/test/Lower/OpenMP/optional-argument-map-2.f90
index a787ad78dfafd..5d64b95d13ad6 100644
--- a/flang/test/Lower/OpenMP/optional-argument-map-2.f90
+++ b/flang/test/Lower/OpenMP/optional-argument-map-2.f90
@@ -72,7 +72,7 @@ end module mod
! CHECK-FPRIV: %[[VAL_13:.*]] = arith.subi %[[VAL_12]]#1, %[[VAL_11]] : index
! CHECK-FPRIV: %[[VAL_14:.*]] = omp.map.bounds lower_bound(%[[VAL_10]] : index) upper_bound(%[[VAL_13]] : index) extent(%[[VAL_12]]#1 : index) stride(%[[VAL_11]] : index) start_idx(%[[VAL_10]] : index) {stride_in_bytes = true}
! CHECK-FPRIV: %[[VAL_16:.*]] = fir.box_offset %[[VAL_0]] base_addr : (!fir.ref<!fir.boxchar<1>>) -> !fir.llvm_ptr<!fir.ref<!fir.char<1,?>>>
-! CHECK-FPRIV: %[[VAL_17:.*]] = omp.map.info var_ptr(%[[VAL_0]] : !fir.ref<!fir.boxchar<1>>, !fir.char<1,?>) map_clauses(to) capture(ByRef) var_ptr_ptr(%[[VAL_16]] : !fir.llvm_ptr<!fir.ref<!fir.char<1,?>>>) bounds(%[[VAL_14]]) -> !fir.llvm_ptr<!fir.ref<!fir.char<1,?>>> {name = ""}
+! CHECK-FPRIV: %[[VAL_17:.*]] = omp.map.info var_ptr(%[[VAL_0]] : !fir.ref<!fir.boxchar<1>>, !fir.char<1,?>) map_clauses(tofrom) capture(ByRef) var_ptr_ptr(%[[VAL_16]] : !fir.llvm_ptr<!fir.ref<!fir.char<1,?>>>) bounds(%[[VAL_14]]) -> !fir.llvm_ptr<!fir.ref<!fir.char<1,?>>> {name = ""}
! CHECK-FPRIV: %[[VAL_18:.*]] = omp.map.info var_ptr(%[[VAL_0]] : !fir.ref<!fir.boxchar<1>>, !fir.boxchar<1>) map_clauses(to) capture(ByRef) members(%[[VAL_17]] : [0] : !fir.llvm_ptr<!fir.ref<!fir.char<1,?>>>) -> !fir.ref<!fir.boxchar<1>>
! CHECK-FPRIV: omp.target map_entries(%[[VAL_7]] -> %[[VAL_19:.*]], %[[VAL_18]] -> %[[VAL_20:.*]], %[[VAL_17]] -> %[[VAL_21:.*]] : !fir.ref<!fir.char<1,4>>, !fir.ref<!fir.boxchar<1>>, !fir.llvm_ptr<!fir.ref<!fir.char<1,?>>>) private(@_QMmodFroutine_boxcharEa_firstprivate_boxchar_c8xU %[[VAL_3]]#0 -> %[[VAL_22:.*]] [map_idx=1] : !fir.boxchar<1>) {
! CHECK-FPRIV: %[[VAL_23:.*]] = arith.constant 4 : index
diff --git a/flang/test/Transforms/omp-maps-for-privatized-symbols.fir b/flang/test/Transforms/omp-maps-for-privatized-symbols.fir
index 10a76126ed054..6054c70a2700d 100644
--- a/flang/test/Transforms/omp-maps-for-privatized-symbols.fir
+++ b/flang/test/Transforms/omp-maps-for-privatized-symbols.fir
@@ -6,7 +6,12 @@ module attributes {omp.is_target_device = false} {
// extract box address, see if it is null, etc
omp.yield(%arg1: !fir.ref<!fir.box<!fir.heap<i32>>>)
}
-
+ omp.private {type = firstprivate} @_QFtarget_simpleEfp_int_firstprivate_i32 : i32 copy {
+ ^bb0(%arg0: !fir.ref<i32>, %arg1: !fir.ref<i32>):
+ %0 = fir.load %arg0 : !fir.ref<i32>
+ hlfir.assign %0 to %arg1 : i32, !fir.ref<i32>
+ omp.yield(%arg1 : !fir.ref<i32>)
+ }
func.func @_QPtarget_simple() {
%0 = fir.alloca i32 {bindc_name = "a", uniq_name = "_QFtarget_simpleEa"}
%1:2 = hlfir.declare %0 {uniq_name = "_QFtarget_simpleEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
@@ -15,34 +20,18 @@ module attributes {omp.is_target_device = false} {
%4 = fir.embox %3 : (!fir.heap<i32>) -> !fir.box<!fir.heap<i32>>
fir.store %4 to %2 : !fir.ref<!fir.box<!fir.heap<i32>>>
%5:2 = hlfir.declare %2 {fortran_attrs = #fir.var_attrs<allocatable>, uniq_name = "_QFtarget_simpleEsimple_var"} : (!fir.ref<!fir.box<!fir.heap<i32>>>) -> (!fir.ref<!fir.box<!fir.heap<i32>>>, !fir.ref<!fir.box<!fir.heap<i32>>>)
+ %6 = fir.alloca i32 {bindc_name = "fp_int", uniq_name = "_QFtarget_simpleEfp_int"}
+ %7:2 = hlfir.declare %6 {uniq_name = "_QFtarget_simpleEfp_int"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
%c2_i32 = arith.constant 2 : i32
hlfir.assign %c2_i32 to %1#0 : i32, !fir.ref<i32>
- %6 = omp.map.info var_ptr(%1#1 : !fir.ref<i32>, i32) map_clauses(to) capture(ByRef) -> !fir.ref<i32> {name = "a"}
- omp.target map_entries(%6 -> %arg0 : !fir.ref<i32>) private(@_QFtarget_simpleEsimple_var_private_ref_box_heap_i32 %5#0 -> %arg1 : !fir.ref<!fir.box<!fir.heap<i32>>>) {
- %11:2 = hlfir.declare %arg0 {uniq_name = "_QFtarget_simpleEa"} : (!fir.ref<i32>) -> (!fir.ref<i32>, !fir.ref<i32>)
- %12:2 = hlfir.declare %arg1 {fortran_attrs = #fir.var_attrs<allocatable>, uniq_name = "_QFtarget_simpleEsimple_var"} : (!fir.ref<!fir.box<!fir.heap<i32>>>) -> (!fir.ref<!fir.box<!fir.heap<i32>>>, !fir.ref<!fir.box<!fir.heap<i32>>>)
- %c10_i32 = arith.constant 10 : i32
- %13 = fir.load %11#0 : !fir.ref<i32>
- %14 = arith.addi %c10_i32, %13 : i32
- hlfir.assign %14 to %12#0 realloc : i32, !fir.ref<!fir.box<!fir.heap<i32>>>
+ %8 = omp.map.info var_ptr(%1#1 : !fir.ref<i32>, i32) map_clauses(to) capture(ByRef) -> !fir.ref<i32> {name = "a"}
+ omp.target map_entries(%8 -> %arg0 : !fir.ref<i32>) private(@_QFtarget_simpleEsimple_var_private_ref_box_heap_i32 %5#0 -> %arg1, @_QFtarget_simpleEfp_int_firstprivate_i32 %7#0 -> %arg2 : !fir.ref<!fir.box<!fir.heap<i32>>>, !fir.ref<i32>) {
omp.terminator
}
- %7 = fir.load %5#1 : !fir.ref<!fir.box<!fir.heap<i32>>>
- %8 = fir.box_addr %7 : (!fir.box<!fir.heap<i32>>) -> !fir.heap<i32>
- %9 = fir.convert %8 : (!fir.heap<i32>) -> i64
- %c0_i64 = arith.constant 0 : i64
- %10 = arith.cmpi ne, %9, %c0_i64 : i64
- fir.if %10 {
- %11 = fir.load %5#1 : !fir.ref<!fir.box<!fir.heap<i32>>>
- %12 = fir.box_addr %11 : (!fir.box<!fir.heap<i32>>) -> !fir.heap<i32>
- fir.freemem %12 : !fir.heap<i32>
- %13 = fir.zero_bits !fir.heap<i32>
- %14 = fir.embox %13 : (!fir.heap<i32>) -> !fir.box<!fir.heap<i32>>
- fir.store %14 to %5#1 : !fir.ref<!fir.box<!fir.heap<i32>>>
- }
return
}
}
// CHECK: %[[MAP0:.*]] = omp.map.info var_ptr({{.*}} : !fir.ref<i32>, i32) map_clauses(to) capture(ByRef) -> !fir.ref<i32> {name = "a"}
-// CHECK: %[[MAP1:.*]] = omp.map.info var_ptr({{.*}} : !fir.ref<!fir.box<!fir.heap<i32>>>, !fir.box<!fir.heap<i32>>) map_clauses(to) capture(ByRef) -> !fir.ref<!fir.box<!fir.heap<i32>>>
-// CHECK: omp.target map_entries(%[[MAP0]] -> %arg0, %[[MAP1]] -> %arg1 : !fir.ref<i32>, !fir.ref<!fir.box<!fir.heap<i32>>>)
+// CHECK: %[[MAP1:.*]] = omp.map.info var_ptr({{.*}} : !fir.ref<!fir.box<!fir.heap<i32>>>, !fir.box<!fir.heap<i32>>) map_clauses(tofrom) capture(ByRef) -> !fir.ref<!fir.box<!fir.heap<i32>>>
+// CHECK: %[[MAP2:.*]] = omp.map.info var_ptr({{.*}} : !fir.ref<i32>, i32) map_clauses(to) capture(ByCopy) -> !fir.ref<i32>
+// CHECK: omp.target map_entries(%[[MAP0]] -> %arg0, %[[MAP1]] -> %arg1, %[[MAP2]] -> %arg2 : !fir.ref<i32>, !fir.ref<!fir.box<!fir.heap<i32>>>, !fir.ref<i32>)
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agozillon
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LGTM @bhandarkar-pranav thank you for the fix!
mhalk
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LGTM, at least as far as I can tell -- thank you Pranav for fixing this!
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Nov 13, 2025
… MapsForPrivatizedSymbolsPass (llvm#167554) The descriptors of a variable that has been privatized should be mapped `tofrom` instead of `to`.
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The descriptors of a variable that has been privatized should be mapped
tofrominstead ofto.