Syntax
addf $s_reg1, $s_reg2, $d_reg
addf $d_reg/$s_reg1, $s_reg2
Description
Add F_floating adds the contents of $s_reg1 or $d_reg to the contents of $s_reg2 and places the result in $d_reg. When the sum of two operands is exactly 0, the sum has a positive sign for all rounding modes except round toward minus infinity (-¥). For that rounding mode, the sum has a negative sign.
Qualifiers
The following table describes the qualifiers for the addf instructions:
| Instruction | Qualifier Description |
| no qualifier | VAX Rounding Mode: Normal rounding |
| VAX Trap Mode: Imprecise, underflow disabled | |
| addfc | VAX Rounding Mode: Chopped |
| addfu | VAX Trap Mode: Imprecise, underflow enabled |
| addfuc | Combined meanings of addfc and addfu |
| addfs | VAX Trap Mode: Software, underflow disabled |
| addfsc | Combined meanings of addfs and addfc |
| addfsu | VAX Trap Mode: Software, underflow enabled |
| addfsuc | Combined meanings of addfs and addfuc |