pseudocode/library/type_conversion_helpers.tosac

//
// 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.

// Returns a signed version of the given type
// A no-op for floating-point types
Type make_signed(Type in_t)
{
    switch(in_t) {
        case bool_t:
            return bool_t;
        case i8_t:
            return int8_t;
        case i16_t:
            return int16_t;
        case i32_t:
            return int32_t;
        case i48_t:
            return int48_t;
        case fp16_t:
            return fp16_t;
        case bf16_t:
            return bf16_t;
        case fp32_t:
            return fp32_t;
    }
}

// Returns the usigned type of the given type
// Error to call this with anything but i8_t or i16_t

Type make_unsigned(Type in_t)
{
    ERROR_IF(in_t != i8_t && in_t != i16_t);
    switch(in_t) {
        case i8_t:
            return uint8_t;
        case i16_t:
            return uint16_t;
    }
}

out_t static_cast<out_t>(in_t value)
{
    // Operates similar to the c++ standard static_cast
    // Limited to simple numeric conversion for TOSA.
    // Sign extends signed integer input types if needed
    // Zero extends unsigned integer input types if needed
    // Truncates when converting to a smaller width data type
    // Conversion from integer to floating-point is exact if possible
    // If converting between signless integer types, treated as signed integer
}

out_t bitcast<out_t>(in_t value)
{
    // Treats the bits of value as if they were of type out_t
    // Only supported for integer types of the same bit width
}