Signed integer division rounds to

R2026b

How compiler for selected hardware rounds results of signed integer division

Model Configuration Pane: Hardware Implementation

Description

The Signed integer division rounds to parameter describes how the compiler for the hardware rounds the result of dividing two signed integers.

This parameter is enabled only if you can modify it for the selected hardware.

Zero (default) | Undefined | Floor

Selecting a device by using the Device vendor and Device type parameters sets a device-specific value for this parameter.

Undefined: Choose this option if neither Zero nor Floor describes the compiler behavior, or if that behavior is unknown.
Zero: If the quotient is between two integers, the compiler chooses the integer that is closer to zero as the result.
Floor: If the quotient is between two integers, the compiler chooses the integer that is closer to negative infinity.

To simulate rounding behavior of the C compiler that you use to compile generated code, use the Integer rounding mode parameter for blocks. This setting appears on the Signal Attributes pane of the parameter dialog boxes of blocks that can perform signed integer arithmetic, such as the Product block.
For most blocks, the value of Integer rounding mode completely defines rounding behavior. For blocks that support fixed-point data and the Simplest rounding mode, the value of Signed integer division rounds to also affects rounding. For details, see Rounding Modes (Fixed-Point Designer).
For more information on how this parameter affects code generation, see Hardware Implementation Options (Simulink Coder).

This table lists the compiler behavior described by the options for this parameter.

N	D	Ideal N/D	Zero	Floor	Undefined
`33`	4	`8.25`	`8`	`8`	`8`
`-33`	`4`	`-8.25`	`-8`	`-9`	`-8` or `-9`
`33`	`-4`	`-8.25`	`-8`	`-9`	`-8` or `-9`
`-33`	`-4`	`8.25`	`8`	`8`	`8` or `9`

Application	Setting
Debugging	No impact for simulation or during development. `Undefined` for production code generation.
Traceability	No impact for simulation or during development. `Zero` or `Floor` for production code generation.
Efficiency	No impact for simulation or during development. `Zero` for production code generation.
Safety precaution	No recommendation for simulation without code generation. For simulation with code generation, select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.

Parameter: ProdIntDivRoundTo

Type: string | character vector

Value: "Floor" | "Zero" | "Undefined"

Default: 'Zero'

Introduced in R2006b