Syntax
subs $s_reg1, $s_reg2, $d_reg
subs $d_reg/$s_reg1, $s_reg2
Description
Subtract S_floating subtracts the contents of $s_reg2 from the contents of $s_reg1 or $d_reg and places the result into $d_reg. When the difference of the two operands is exactly 0, the difference has a positive sign for all rounding modes except round toward minus infinity (-¥). For that rounding mode, the difference has a negative sign.
Qualifiers
The following table describes the qualifiers for the subs instructions:
| Instruction | Qualifier description |
| no qualifier | IEEE Rounding Mode: Normal rounding |
| IEEE Trap Mode: Imprecise, integer overflow disabled, inexact disabled | |
| subsc | IEEE Rounding Mode: Chopped |
| subsm | IEEE Rounding Mode: Minus infinity |
| subsd | IEEE Rounding Mode: Plus infinity (ensure that the dyn field of the FPCR is 11) |
| subsu | IEEE Trap Mode: Imprecise, underflow enabled, inexact disabled |
| subsuc | IEEE Trap Mode: Underflow enabled |
| IEEE Rounding Mode: Chopped | |
| subsum | Combined meanings of subsu and subsm |
| subsud | Combined meanings of subsu and subsd |
| subssu | IEEE Trap Mode: Software, underflow enabled, inexact disabled |
| subssuc | Combined meanings of subss, subsu, and subsc |
| subssum | Combined meanings of subss, subsu, and subsm |
| subssud | Combined meanings of subss, subsu, and subsd |
| subssui | IEEE Trap Mode: Software, underflow enabled, inexact enabled |
| subssuic | Combined meanings of subssui and subsc |
| subssuim | Combined meanings of subssui and subsm |