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[Flang] Propogate fir.declare attributes through cg-rewrite #137207

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[Flang] Propogate fir.declare attributes through cg-rewrite #137207

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3301f3e
propogate attributes through cg-rewrite
SusanTan Apr 24, 2025
353e86a
format
SusanTan Apr 24, 2025
a26f871
Merge remote-tracking branch 'origin/main' into susant/cg-rewrite
SusanTan Apr 28, 2025
aa366ae
remove propogation when fir.declare is removed
SusanTan Apr 28, 2025
196dfeb
update comment
SusanTan Apr 28, 2025
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8 changes: 7 additions & 1 deletion flang/lib/Optimizer/CodeGen/PreCGRewrite.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -299,11 +299,17 @@ class DeclareOpConversion : public mlir::OpRewritePattern<fir::DeclareOp> {
else
return mlir::failure();
}
// FIXME: Add FortranAttrs and CudaAttrs

auto xDeclOp = rewriter.create<fir::cg::XDeclareOp>(
loc, declareOp.getType(), declareOp.getMemref(), shapeOpers, shiftOpers,
declareOp.getTypeparams(), declareOp.getDummyScope(),
declareOp.getUniqName());

// Propagate all attributes to fircg.ext_declare to avoid losing metadata
// including CUDA and OpenACC attributes.
for (const mlir::NamedAttribute &attr : declareOp->getAttrs())
xDeclOp->setAttr(attr.getName(), attr.getValue());
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@jeanPerier jeanPerier Apr 30, 2025

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How is this not overriding the operandSegmentSizes attribute of the AttrSizedOperandSegments interface of the newly created xDeclOp with the one from the declareOp?

I would suggest checking if the attributes names are not already used in the xDeclop to avoid any issues.


LLVM_DEBUG(llvm::dbgs()
<< "rewriting " << declareOp << " to " << xDeclOp << '\n');
rewriter.replaceOp(declareOp, xDeclOp.getOperation()->getResults());
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17 changes: 14 additions & 3 deletions flang/test/Fir/declare-codegen.fir
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Expand Up @@ -23,7 +23,7 @@ func.func private @bar(%arg0: !fir.ref<!fir.array<12x23xi32>>)

// DECL-LABEL: func.func @test(
// DECL-SAME: %[[arg0:.*]]: !fir.ref<!fir.array<12x23xi32>>) {
// DECL: fircg.ext_declare
// DECL: fircg.ext_declare{{.*}}{uniq_name = "_QFarray_numeric_lboundsEx"}


func.func @useless_shape_with_duplicate_extent_operand(%arg0: !fir.ref<!fir.array<3x3xf32>>) {
Expand All @@ -37,7 +37,7 @@ func.func @useless_shape_with_duplicate_extent_operand(%arg0: !fir.ref<!fir.arra
// NODECL-NEXT: return

// DECL-LABEL: func.func @useless_shape_with_duplicate_extent_operand(
// DECL: fircg.ext_declare
// DECL: fircg.ext_declare{{.*}}{uniq_name = "u"}

// Test DCE does not crash because of unreachable code.
func.func @unreachable_code(%arg0: !fir.ref<!fir.char<1,10>>) {
Expand All @@ -51,4 +51,15 @@ func.func @unreachable_code(%arg0: !fir.ref<!fir.char<1,10>>) {
// NODECL-LABEL: func.func @unreachable_code(
// NODECL-NOT: uniq_name = "live_code"
// DECL-LABEL: func.func @unreachable_code(
// DECL: uniq_name = "live_code"
// DECL: fircg.ext_declare{{.*}}{uniq_name = "live_code"}
// DECL: fir.declare{{.*}}{uniq_name = "dead_code"}


// Test that attributes get attached to the memref operation when fir.declare is not preserved
func.func @test_local_memref() {
%0 = fir.alloca !fir.array<10xi32> {uniq_name = "local_array"}
%1 = fir.declare %0 {uniq_name = "local_array_declare", acc.declare = #acc.declare<dataClause = acc_create>} : (!fir.ref<!fir.array<10xi32>>) -> !fir.ref<!fir.array<10xi32>>
return
}
// DECL-LABEL: func.func @test_local_memref() {
// DECL: fircg.ext_declare{{.*}}{acc.declare = #acc.declare<dataClause = acc_create>, uniq_name = "local_array_declare"}