Struct gpcas_cpu_model::InstructionLatencies

pub struct InstructionLatencies {
    pub integer_multiply: Option<u16>,
    pub integer_divide: Option<u16>,
    pub integer_multiply_add: Option<u16>,
    pub integer_shift: Option<u16>,
    pub float_add: Option<u16>,
    pub float_multiply: Option<u16>,
    pub float_divide: Option<u16>,
    pub float_multiply_add: Option<u16>,
}

Defines the amount of clock cycles each instruction type needs.

The fields of this struct are used to selectively overwrite default values. If a field is None, the default value is used.

A value of zero means that the type isn’t supported in a pipeline. By default, all types are supported.

Fields

integer_multiply: Option<u16>

Typically takes multiple, but few clock cycles.

integer_divide: Option<u16>

Takes many clock cycles, usually dependent on the operand size.

integer_multiply_add: Option<u16>

Combination of add- and mul-operation.

integer_shift: Option<u16>

Completes fast, but needs a shifter.

float_add: Option<u16>

Might take longer than floating point multiplication.

float_multiply: Option<u16>

Usually as fast as integer multiplication.

float_divide: Option<u16>

Takes many clock cycles, usually dependent on the operand size.

float_multiply_add: Option<u16>

Might need multiple execution ports if a design has separate add- and mul-pipes.

Implementations

impl InstructionLatencies

pub fn as_array(&self) -> [u16; 14]

Transforms the object into an array conforming to the gpcas_base::instruction_type definition as array indices.

Trait Implementations

impl Default for InstructionLatencies

fn default() -> InstructionLatencies

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for InstructionLatencies

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl Serialize for InstructionLatencies

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.