vcsr

Vector Control and Status Register

Contains aliases to vxrm and vxsat CSRs

Attributes

Requirement

Defining extensions

Zvl32b

Vector register length must be at least 32 bits

CSR Address

0xf

Length

* 32 when CSR[misa].MXL == 0 * 64 when CSR[misa].MXL == 1

Privilege Mode

This CSR format changes dynamically.

Figure 1. vcsr Format when CSR[misa].MXL == 0

Figure 2. vcsr Format when CSR[misa].MXL == 1

Name	Location	Type	Reset Value
vcsr.VXRM	2:1	RW-RH	UNDEFINED_LEGAL
vcsr.VXSAT	0	RW-RH	UNDEFINED_LEGAL

Name

Location

Type

Reset Value

2:1

RW-RH

UNDEFINED_LEGAL

RW-RH

UNDEFINED_LEGAL

This CSR may store a value that is different from what software attempts to write.

When a software write occurs (e.g., through csrrw), the following determines the written value:

VXRM = CSR[vxrm].VALUE = csr_value.VXRM;
return csr_value.VXRM;

VXSAT = CSR[vxsat].VALUE = csr_value.VXSAT;
return csr_value.VXSAT;