P4C
The P4 Compiler
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BFN::RemoveSelectBooleans

Set of passes that convert boolean values in select statements to bit<1> values. The node is also transformed to IR:BFN:ReinterpretCasts.

Collaboration diagram for BFN::RemoveSelectBooleans:

Set of passes that convert boolean values in select statements to bit<1> values. The node is also transformed to IR:BFN:ReinterpretCasts.

Copyright (C) 2024 Intel Corporation

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

SPDX-License-Identifier: Apache-2.0

These passes take care of select statements with boolean values such as this one:

(...)

header example_bridge_h { bit<32> dst_mac_addr_low; bit<32> src_mac_addr_low; bool ipv4_valid_in_ingress; }

struct metadata_t { example_bridge_h example_bridge_hdr; }

(...)

transition select(eg_md.example_bridge_hdr.ipv4_valid_in_ingress) { true: accept; default: reject; }

Expression "eg_md.example_bridge_hdr.ipv4_valid_in_ingress" is translated to "(bit<1>)eg_md.example_bridge_hdr.ipv4_valid_in_ingress", select value "true" is translated to (bit<1>)1 while the associated nodes are transformed to IR::BFN::ReinterpretCast.