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mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp: cast-to-iN(cast-t… #21

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Merged
merged 1 commit into from
Apr 14, 2023
Merged

mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp: cast-to-iN(cast-t… #21

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12 changes: 12 additions & 0 deletions mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -622,6 +622,18 @@ OpFoldResult CastOp::fold(ArrayRef<Attribute> operands) {
if (getInput().getType() == getType())
return getInput();

// cast-to-iN(cast-to-iM(x)) -> cast-to-iN(x) when N <= M
if (auto cast = getInput().getDefiningOp<CastOp>()) {
auto intermediateElTy = cast.getType().getElementType().dyn_cast<IntegerType>();
auto finalElTy = getType().getElementType().dyn_cast<IntegerType>();
if (intermediateElTy && finalElTy &&
intermediateElTy.getSignedness() == finalElTy.getSignedness() &&
intermediateElTy.getWidth() >= finalElTy.getWidth()) {
getInputMutable().assign(cast.getInput());
return getResult();
}
}

auto operand = operands[0].dyn_cast_or_null<ElementsAttr>();
if (!operand)
return {};
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26 changes: 26 additions & 0 deletions mlir/test/Dialect/Tosa/canonicalize.mlir
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Expand Up @@ -39,6 +39,32 @@ func.func @cast_nofold(%arg0: tensor<?x1xf32>) -> tensor<?x1xi32> {
return %0 : tensor<?x1xi32>
}

// CHECK-LABEL: @cast_fold_double
func.func @cast_fold_double(%arg0: tensor<?x1xf32>) -> tensor<?x1xi8> {
// CHECK: "tosa.cast"{{.*}} (tensor<?x1xf32>) -> tensor<?x1xi8>
%0 = "tosa.cast"(%arg0) : (tensor<?x1xf32>) -> tensor<?x1xi16>
%1 = "tosa.cast"(%0) : (tensor<?x1xi16>) -> tensor<?x1xi8>
return %1 : tensor<?x1xi8>
}

// CHECK-LABEL: @cast_no_fold_double1
func.func @cast_no_fold_double1(%arg0: tensor<?x1xf32>) -> tensor<?x1xi8> {
// CHECK: "tosa.cast"{{.*}} (tensor<?x1xf32>) -> tensor<?x1xui16>
// CHECK: "tosa.cast"{{.*}} (tensor<?x1xui16>) -> tensor<?x1xi8>
%0 = "tosa.cast"(%arg0) : (tensor<?x1xf32>) -> tensor<?x1xui16>
%1 = "tosa.cast"(%0) : (tensor<?x1xui16>) -> tensor<?x1xi8>
return %1 : tensor<?x1xi8>
}

// CHECK-LABEL: @cast_no_fold_double2
func.func @cast_no_fold_double2(%arg0: tensor<?x1xf32>) -> tensor<?x1xi16> {
// CHECK: "tosa.cast"{{.*}} (tensor<?x1xf32>) -> tensor<?x1xi8>
// CHECK: "tosa.cast"{{.*}} (tensor<?x1xi8>) -> tensor<?x1xi16>
%0 = "tosa.cast"(%arg0) : (tensor<?x1xf32>) -> tensor<?x1xi8>
%1 = "tosa.cast"(%0) : (tensor<?x1xi8>) -> tensor<?x1xi16>
return %1 : tensor<?x1xi16>
}

// CHECK-LABEL: @clamp_not_noop
func.func @clamp_not_noop(%arg0: tensor<4xi32>) -> tensor<4xi32> {
// CHECK: "tosa.clamp"
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