V Extension
Instructions
The following instructions are affected by this extension:
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Vector-vector integer addition |
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Vector Set Vector Type Immediate and Vector Length Immediate |
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Vector Set Vector Type and Vector Length |
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Vector Set Vector Type and Vector Length Immediate |
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Parameters
This extension has the following implementation options (AKA parameters):
- ELEN
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Type
integer
Valid Values
integer
Description
The maximum size in bits of a vector element that any operation can produce or consume.
- FOLLOW_VTYPE_RESET_RECOMMENDATION
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Type
boolean
Valid Values
boolean
Description
It is recommended that at reset, vtype.vill is set, the remaining bits in vtype are zero, and vl is set to zero. If this parameter is set to true, this recommendation is followed. If it is false, at reset the respective fields will be UNDEFINED_LEGAL.
- HW_MSTATUS_VS_DIRTY_UPDATE
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Type
string
Valid Values
[never, precise, imprecise]
Description
Indicates whether or not hardware will write to mstatus.VS
Values are:
never
Hardware never writes mstatus.VS
precise
Hardware writes mstatus.VS to the Dirty (3) state precisely when V registers are modified
imprecise
Hardware writes mstatus.VS imprecisely. This will result in a call to unpredictable() on any attempt to read mstatus or write vector state.
- MSTATUS_VS_LEGAL_VALUES
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Type
array
Valid Values
1-element to 4-element array of [0, 1, 2, 3]
Description
The set of values that mstatus.VS will accept from a software write.
- MUTABLE_MISA_V
- RVV_VL_WHEN_AVL_LT_DOUBLE_VLMAX
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Type
string
Valid Values
[ceil(AVL/2), VLMAX, custom]
Description
The value assigned to VL when AVL < 2*VLMAX.
- VLEN
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Type
integer
Valid Values
integer
Description
The number of bits in a single vector register.