pseudocode/library/apply_broadcast.tosac


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//
// This confidential and proprietary software may be used only as
// authorised by a licensing agreement from ARM Limited
// (C) COPYRIGHT 2020-2024 ARM Limited
// ALL RIGHTS RESERVED
// The entire notice above must be reproduced on all authorised
// copies and copies may only be made to the extent permitted
// by a licensing agreement from ARM Limited.

// The index argument should be a valid location within out_shape.
// The function returns the location within in_shape that contributes
// to the output based on broadcasting rules.

shape_t apply_broadcast(shape_t out_shape, shape_t in_shape, shape_t index) {
    ERROR_IF(rank(out_shape) != rank(in_shape));
    ERROR_IF(rank(out_shape) != rank(index));
    for (int32_t i = 0; i < rank(out_shape); i++) {
        if (out_shape[i] != in_shape[i]) {
            ERROR_IF(in_shape[i] != 1);
            index[i] = 0;
        }
    }
    return index;
}