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Add a canonicalization pattern to remove redundant dynamic_reshapes. 

PiperOrigin-RevId: 344517381
This commit is contained in:
Adrian Kuegel 2020-11-27 04:46:02 -08:00 committed by TensorFlow MLIR Team
parent f183e95e69
commit d14c63da54
3 changed files with 21 additions and 2 deletions
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4
lib/Dialect/mhlo/IR/hlo_ops.cc
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@ -1268,8 +1268,8 @@ class DynamicReshapeOpNotActuallyDynamic
void DynamicReshapeOp::getCanonicalizationPatterns(
OwningRewritePatternList& results, MLIRContext* context) {
results.insert<DynamicReshapeOpNotActuallyDynamic, ShapeOfDynamicReshape>(
context);
results.insert<DynamicReshapeOpNotActuallyDynamic,
RemoveRedundantDynamicReshape, ShapeOfDynamicReshape>(context);
}
//===----------------------------------------------------------------------===//

5
lib/Dialect/mhlo/IR/mhlo_canonicalize.td
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@ -28,3 +28,8 @@ def UnaryEinsumToEinsum : Pat<
(HLO_UnaryEinsumOp $operand, $equation),
(HLO_EinsumOp (HLO_ConstOp (GetScalarOfType<1> $operand)),
$operand, (UnaryToBinaryEinsumEq $equation))>;
// A dynamic reshape of a dynamic reshape is a dynamic reshape.
def RemoveRedundantDynamicReshape : Pat<
(HLO_DynamicReshapeOp (HLO_DynamicReshapeOp $operand, $shape1), $shape2),
(HLO_DynamicReshapeOp $operand, $shape2)>;

14
tests/canonicalize.mlir
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@ -585,6 +585,20 @@ func @shape_of_dynamic_reshape(%arg0: tensor<*xf32>, %shape: tensor<2xindex>) ->
return %1 : tensor<2xindex>
}
// CHECK-LABEL: func @dynamic_reshape_of_dynamic_reshape
// CHECK-SAME: [[ARG0:%[a-zA-Z0-9]+]]
// CHECK-SAME: [[ARG1:%[a-zA-Z0-9]+]]
func @dynamic_reshape_of_dynamic_reshape(%arg0: tensor<?xf16>, %shape: tensor<?xindex>) -> tensor<?xf16> {
// CHECK: [[RES:%[a-zA-Z0-9]+]] = "mhlo.dynamic_reshape"([[ARG0]], %{{[a-zA-Z0-9]+}}) : (tensor<?xf16>, tensor<1xindex>) -> tensor<?xf16>
// CHECK: return [[RES]]
%0 = "mhlo.dynamic_reshape"(%arg0, %shape) : (tensor<?xf16>, tensor<?xindex>) -> tensor<*xf16>
%1 = shape.shape_of %0 : tensor<*xf16> -> tensor<?xindex>
%2 = shape.num_elements %1 : tensor<?xindex> -> index
%3 = tensor_from_elements %2 : tensor<1xindex>
%4 = "mhlo.dynamic_reshape"(%0, %3) : (tensor<*xf16>, tensor<1xindex>) -> tensor<?xf16>
return %4 : tensor<?xf16>
}
// CHECK-LABEL: do_not_dce_while_with_outfeed
func @do_not_dce_while_with_outfeed(%arg0: tensor<i64>) -> tensor<i64> {
// CHECK: mhlo.while