10.3 Rounding
Three rounding modes are supported, corresponding to the three rounding modes supported by the DSC device fixed-point multiplication facilities.
| Mode | Description |
|---|---|
| Truncation | Truncate signed result - round toward -saturation |
| Conventional | Round signed result to nearest, ties toward +saturation |
| Convergent | Round signed result to nearest, ties to even |
All operations on fixed point variables, whether intrinsically supported
by the hardware or not, are performed according to the prevailing rounding mode chosen. The
rounding mode may be specified globally via the -menable-fixed compiler
switch, as described in the 6.6 Driver Option Descriptions section or on a function-by-function
basis, via the round attribute, as described in 14.1.2 Function Attributes.
These modes are described in more detail in the “16-bit MCU and DSC Programmer’s Reference Manual” (DS-70000157).