SDCC supports IEEE (single precision 4 bytes) floating point numbers.
The floating point support routines are derived from gcc's floatlib.c
and consist of the following routines:
| Function | Description |
| _fsadd.c | add floating point numbers |
| _fssub.c | subtract floating point numbers |
| _fsdiv.c | divide floating point numbers |
| _fsmul.c | multiply floating point numbers |
| _fs2uchar.c | convert floating point to unsigned char |
| _fs2char.c | convert floating point to signed char |
| _fs2uint.c | convert floating point to unsigned int |
| _fs2int.c | convert floating point to signed int |
| _fs2ulong.c | convert floating point to unsigned long |
| _fs2long.c | convert floating point to signed long |
| _uchar2fs.c | convert unsigned char to floating point |
| _char2fs.c | convert char to floating point number |
| _uint2fs.c | convert unsigned int to floating point |
| _int2fs.c | convert int to floating point numbers |
| _ulong2fs.c | convert unsigned long to floating point number |
| _long2fs.c | convert long to floating point number |
These support routines are developed in ANSI-C so there is room for space and speed improvement3.8. Note if all these routines are used simultaneously the data space might overflow. For serious floating point usage the large model might be needed. Also notice that you don't have to call this routines directly. The compiler will use them automatically every time a floating point operation is required.