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[MLIR][TOSA] Lower tosa.identity and tosa.identitiyn to linalg

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Both identity ops can be loweried by replacing their results with their
inputs. We keep this as a linalg lowering as other backends may choose to
create copies.

Differential Revision: https://reviews.llvm.org/D97517
This commit is contained in:
Rob Suderman 2021-02-25 17:46:23 -08:00
parent 016f0ee686
commit f685c9ac86
2 changed files with 30 additions and 1 deletions
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18
mlir/lib/Conversion/TosaToLinalg/TosaToLinalg.cpp
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@ -442,6 +442,21 @@ public:
}
};
// At the codegen level any identity operations should be removed. Any cases
// where identity is load-bearing (e.g. cross device computation) should be
// handled before lowering to codegen.
template <typename SrcOp>
class IdentityNConverter : public OpRewritePattern<SrcOp> {
public:
using OpRewritePattern<SrcOp>::OpRewritePattern;
LogicalResult matchAndRewrite(SrcOp op,
PatternRewriter &rewriter) const final {
rewriter.replaceOp(op, op.getOperation()->getOperands());
return success();
}
};
} // namespace
void mlir::tosa::populateTosaToLinalgOnTensorsConversionPatterns(
@ -462,5 +477,6 @@ void mlir::tosa::populateTosaToLinalgOnTensorsConversionPatterns(
PointwiseConverter<tosa::MaximumOp>, PointwiseConverter<tosa::MinimumOp>,
PointwiseConverter<tosa::CeilOp>, PointwiseConverter<tosa::FloorOp>,
PointwiseConverter<tosa::ClampOp>, PointwiseConverter<tosa::ReluNOp>,
ReshapeOpConverter>(context);
IdentityNConverter<tosa::IdentityOp>,
IdentityNConverter<tosa::IdentityNOp>, ReshapeOpConverter>(context);
}

13
mlir/test/Conversion/TosaToLinalg/tosa-to-linalg.mlir
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@ -304,3 +304,16 @@ func @test_reshape_downrank_6D(%arg0: tensor<1x2x3x5x7x11xf32>) -> tensor<6x5x77
%0 = "tosa.reshape"(%arg0) {new_shape = [2, 3]} : (tensor<1x2x3x5x7x11xf32>) -> tensor<6x5x77xf32>
return %0 : tensor<6x5x77xf32>
}
// -----
// CHECK-LABEL: @test_identity
func @test_identity(%arg0: tensor<1xf32>, %arg1: tensor<1xi32>) -> (tensor<1xf32>, tensor<1xi32>) {
%0 = "tosa.identity"(%arg0) : (tensor<1xf32>) -> tensor<1xf32>
%1 = "tosa.identity"(%arg1) : (tensor<1xi32>) -> tensor<1xi32>
%2:2 = "tosa.identityn"(%0, %1) : (tensor<1xf32>, tensor<1xi32>) -> (tensor<1xf32>, tensor<1xi32>)
// CHECK: return %arg0, %arg1
return %2#0, %2#1 : tensor<1xf32>, tensor<1xi32>
}