Module gpcas_cpu_model::default_latencies

The default latency in clock cycles for all instruction types.

Types not mentioned in here either share their value with another one, or are hardcoded to one clock cycle.

Constants

FLOAT_ADD

Might take longer than floating point multiplication.

FLOAT_DIV

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

FLOAT_MUL

Usually as fast as integer multiplication.

FLOAT_MUL_ADD

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

INT_DIV

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

INT_MUL

Typically takes multiple, but few clock cycles.

INT_MUL_ADD

Combination of add- and mul-operation.

INT_SHIFT

Completes fast, but needs a shifter.