vxsat

Vector Fixed-Point Saturate Flag

Indicates if a fixed-point instruction has had to saturate an output value to fit into a destination format

Attributes

CSR Address

0x9

Defining extension

Length

64-bit

Privilege Mode

Figure 1. vxsat format

Name Location Type Reset Value

Name	Location	Type	Reset Value
`VALUE`	63:0	RW-H	UNDEFINED_LEGAL

63:0

RW-H

UNDEFINED_LEGAL

Location: vxsat[63:0]
Description: The vxsat CSR has a single read-write least-significant bit (vxsat[0]) that indicates if a fixed-point instruction has had to saturate an output value to fit into a destination format. Bits vxsat[XLEN-1:1] should be written as zeros.

The vxsat bit is mirrored in vcsr.
Type

RW-H	Read-Write with Hardware update Field is writable by software. Any value that fits in the field is acceptable. Hardware also updates the field without an explicit software write.

Reset value

UNDEFINED_LEGAL

Software write

This field has special behavior when written by software (e.g., through csrrw).

When software tries to write csr_value, the field will be written with the return value of the function below.

return csr_value.VALUE & 1;

This CSR may return a value that is different from what is stored in hardware.

return CSR[vcsr].VXSAT;

return CSR[vcsr].VXSAT;