Quartus II Settings File Reference Manual - Altera

Chapter 4: Analysis & Synthesis Assignments 4–191
USE_HIGH_SPEED_ADDER
USE_HIGH_SPEED_ADDER
Type
Directs the Compiler whether to use high speed adder circuitry to implement
arithmetic functions or not. This option is useful for improving the performance of
the design when set to On and minimizing the total number of HCells used in the
design when set to Off.
This option applies to HardCopy series devices only.
This option defaults to Auto, which has the same behavior as On when the
Optimization Technique is set to Speed or Balanced, and as Off when the
Optimization Technique is set to Area.
Enumeration
■ Auto
■ Off
■ On
Device Support
This setting can be used in projects targeting the following device families:
■ HardCopy II
■ HardCopy III
■ HardCopy IV
Notes
This assignment is included in the Analysis & Synthesis report.
Syntax
set_global_assignment -name USE_HIGH_SPEED_ADDER
set_global_assignment -name USE_HIGH_SPEED_ADDER -entity
set_instance_assignment -name USE_HIGH_SPEED_ADDER -to -entity
Example
set_global_assignment -name use_high_speed_adder off
Default Value
Auto
June 2012 Altera Corporation Quartus Settings File
Reference Manual