300
UF (A50010): Absolute value of the result is less than the minimum value
that can be expressed for floating-point data.
5-21-6 FLOATING-POINT SUBTRACT: –F(455)
(455)
–F Mi Su R
Ladder Symbol
Variations
↑–F(455)
Operand Data Areas
Mi: First minuend word CIO, G, A, T, C, #, DM
R: First result word CIO, G, A, DM
Su: First subtrahend word CIO, G, A, T, C, #, DM
When the execution condition OFF, –F(455) is not executed. When the execu-
tion condition is ON, –F(455) subtracts the 32-bit floating-point content of Su and
Su+1 from the 32-bit floating-point content of Mi and Mi+1 and places the result
in R and R+1.
R+1 R
Mi Minuend (floating-point data, 32 bits)
Mi+1
Su Subtrahend (floating-point data, 32 bits)
Su+1
Result (floating-point data, 32 bits)
–
If the absolute value of the result is greater than the maximum value that can be
expressed for floating-point data, the Overflow Flag (A50009) will turn ON and
the result will be output as ±.
If the absolute value of the result is less than the minimum value that can be ex-
pressed for floating-point data, the Underflow Flag (A50010) will turn ON and the
result will be output as 0.
The various combinations of minuend and subtrahend data will produce the re-
sults shown in the following table.
Minuend
Subtrahend 0 Numeral + – NaN
0 0 Numeral + –
Numeral Numeral
See
note
1.
+ –
+ – – ER –
– + + + ER
NaN
ER
Note 1. The results could be zero (including underflows), a numeral, +, or –.
2. ER: The Error Flag (A50003) turns ON and the instruction is not executed.
Precautions Mi, Mi+1, Su, and Su+1 must be floating-point data.
Note Refer to page 115 for general precautions on operand data areas.
Flags ER (A50003): Mi, Mi+1, Su, and Su+1 are not floating-point data.
The content of a*DM word is not BCD when set for BCD.
EQ (A50006): The exponent and mantissa of the result are 0.
N (A50008): The result is a negative number.
OF (A50009): The absolute value of the result is greater than the maximum
value that can be expressed for floating-point data.
Description
(CVM1 V2)
Floating-point Math Instructions
Section 5-21
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