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Instruction Descriptions 4–131
4.10.25 IEEE Floating Subtract
Format:
Operation:
Fc ← Fav - Fbv
Exceptions:
Instruction mnemonics:
Qualifiers:
Description:
The subtrahend operand in register Fb is subtracted from the minuend operand in register Fa
and the difference is written to register Fc.
The difference is rounded to the specified precision and then the corresponding range is
checked for overflow/underflow. The single-precision operation on canonical single-precision
values produces a canonical single-precision result.
See Section 4.7.7 for details of the stored result on overflow, underflow, or inexact result.
SUBx Fa.rx,Fb.rx,Fc.wx
!Floating-point Operate format
Invalid Operation
Overflow
Underflow
Inexact Result
SUBS Subtract S_floating
SUBT Subtract T_floating
Rounding: Dynamic (/D)
Minus infinity (/M)
Chopped (/C)
Trapping: Exception Completion (/S)
Underflow Enable (/U)
Inexact Enable (/I)