bit field order - EAS

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  1. Bit order matters when a field uses part of a byte, or spans bytes starting or ending (or both) part way through a byte. Example: 2 bytes of data first 235 (decimal) second 173 (decimal), aka hex EB and AD. I want a bit field beginning at the fourth bit, through the 12th bit.

    c - bit ordering and endianess - Stack Overflow

    stackoverflow.com/questions/2635484/bit-ordering-and-endianess
    stackoverflow.com/questions/2635484/bit-ordering-and-endianess
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    What is bit order?Bit order matters when a field uses part of a byte, or spans bytes starting or ending (or both) part way through a byte. Example: 2 bytes of data first 235 (decimal) second 173 (decimal), aka hex EB and AD. I want a bit field beginning at the fourth bit, through the 12th bit. So, skip over 3 bits, make a 9 bit unsigned integer from the next 9 bits.

    c - bit ordering and endianess - Stack Overflow

    stackoverflow.com/questions/2635484/bit-ordering-and-e…
    Is the Order of bit field allocation implementation-defined?In addition to that, C99 §6.7.2.1, paragraph 10 says: "The order of allocation of bit-fields within a unit (high-order to low-order or low-order to high-order) is implementation-defined." Even a single compiler might lay the bit field out differently depending on the endianness of the target platform, for example.

    C/C++: Force Bit Field Order and Alignment - Stack Overflow

    stackoverflow.com/questions/1490092/c-c-force-bit-field-…
    What is the Order of bit-fields in C?While the C specification does not dictate the ordering of bit-fields, the platform's ABI does. In the case of System V AMD 64, the allocation order of bit-fields is defined as "right to left" (section 3.1.2). For ARM 64, it depends on the endianness of the data type (section 8.1.8.2).

    gcc - Order of fields when using a bit field in C - Stack

    stackoverflow.com/questions/19376426/order-of-fields-w…
    What is bit field type?It is an integer type that determines the bit-field value which is to be interpreted. The type may be int, signed int, or unsigned int. The member name is the name of the bit field. The number of bits in the bit-field. The width must be less than or equal to the bit width of the specified type.

    Bit Fields in C - GeeksforGeeks

    www.geeksforgeeks.org/bit-fields-c/
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  3. gcc - Order of fields when using a bit field in C - Stack …

    https://stackoverflow.com/questions/19376426

    Web16 rows · If enough space remains, a bit-field that immediately follows another bit-field in a ...

    • Reviews: 5

      Code sample

      #define SHIFT_C 14
      unsigned GetField(unsigned all, unsigned mask, unsigned shift) {
        return (all & mask) >> shift;
      }
      unsigned SetField(unsigned all, unsigned mask, unsigned shift, unsigned value) {...
      Clarification about Bit-field ordering semantics in CAug 28, 2015
      C/C++: Force Bit Field Order and Alignment
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    • Bit fields - cppreference.com

      https://en.cppreference.com/w/c/language/bit_field

      WebOct 26, 2022 · Whether a bit field can straddle an allocation unit boundary The order of bit fields within an allocation unit (on some platforms, bit fields are packed left-to-right, on …

    • c - bit ordering and endianess - Stack Overflow

      https://stackoverflow.com/questions/2635484

      WebApr 14, 2010 · Bit order matters when a field uses part of a byte, or spans bytes starting or ending (or both) part way through a byte. Example: 2 bytes of data first 235 (decimal) …

      • Reviews: 2

      • How can I get bitfields to arrange my bits in the right order?

        https://stackoverflow.com/questions/2664778

        WebMar 14, 2013 · The main use of bitfields is either to allow tight packing of data or to be able to specify the fields within some externally produced data files. C gives no guarantee of …

      • c - Why bit endianness is an issue in bitfields? - Stack …

        https://stackoverflow.com/questions/6043483

        WebWhether a bit-field can straddle a storage-unit boundary (6.7.2.1). The order of allocation of bit-fields within a unit (6.7.2.1). Big/little endian is of course also implementation-defined. …

      • Bit-field - cppreference.com

        https://en.cppreference.com/w/cpp/language/bit_field

        WebSep 14, 2022 · Because bit-fields do not necessarily begin at the beginning of a byte, address of a bit-field cannot be taken. Pointers and non-const references to bit-fields …

      • Bit Fields in C - GeeksforGeeks

        https://www.geeksforgeeks.org/bit-fields-c

        WebOct 25, 2022 · The idea of bit-field is to use memory efficiently when we know that the value of a field or group of fields will never exceed a limit or is within a small range. Bit fields …

      • Byte and Bit Order Dissection | Linux Journal

        https://www.linuxjournal.com/article/6788

        WebSep 2, 2003 · Bit order usually follows the same endianness as the byte order for a given computer system. That is, in a big endian system the most significant bit is stored at the …

      • Order of bitfields in a struct - Arduino Forum

        https://forum.arduino.cc/t/order-of-bitfields-in-a-struct/361106

        WebMay 5, 2021 · Setting the bits is done by multiplying the byte by two (left shift 1 bit is fastest way) which moves the saved current pin state (in bit 0) into the previous pin state position …

      • Bit field - Wikipedia

        https://en.wikipedia.org/wiki/Bit_field

        WebA bit field is a data structure that consists of one or more adjacent bits which have been allocated for specific purposes, so that any single bit or group of bits within the structure …

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