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CARM Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Customization Files
Startup Code Basic I/O Memory Allocation Interfacing C to Assembler Function Parameters Function Return Values Using the SRC Directive Register Usage Example Routines ARM Code Example Thumb Code Example Data Storage Formats Byte Order Byte Alignment Integer Scalars 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars 8-Byte Scalars float Scalars float Format float Errors double Scalars double Format double Errors Pointers Bit Fields Absolute Memory Access The __at Keyword Linker Location Controls Error Messages Library Reference Appendixfloat Scalars
Scalars of type float are stored using four bytes (32-bits) following the IEEE-754 standard. They are stored in little endian (default) or big endian (if the BIGENDIAN compiler directive is specified).
Little Endian (default)
When configured for little endian, the low-order byte is stored first, followed by the high-order byte. For example, an integer value of 0x12345678 is stored in memory as follows:
| Address Offset | +0 | +1 | +2 | +3 |
|---|---|---|---|---|
| Contents | 0x78 | 0x56 | 0x34 | 0x12 |
Big Endian
When configured for big endian, the high-order byte is stored first, followed by the low-order byte. For example, an integer value of 0x12345678 is stored in memory as follows:
| Address Offset | +0 | +1 | +2 | +3 |
|---|---|---|---|---|
| Contents | 0x12 | 0x34 | 0x56 | 0x78 |
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