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Floating-point Math Instructions Section 3-15
Description ACOS(464) computes the angle (in radians) for a cosine value expressed as a
32-bit floating-point number in S+1 and S and places the result in R+1 and R.
(The floating point source data must be in IEEE754 format.)
The source data must be between –1.0 and 1.0. If the absolute value of the
source data exceeds 1.0, an error will occur and the instruction will not be
executed.
The result is output to words R+1 and R as an angle (in radians) within the
range of 0 to
Ï€.
The following diagram shows the relationship between the input data and
result.
Flags
Precautions The source data in S+1 and S must be in IEEE754 floating-point data format.
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
Area S R
R+1 R
S
S+1COS
–1
Source (32-bit floating-point data)
Result (32-bit floating-point data)
R
S: Input data (cosine value)
R: Result (radians)
Name Label Operation
Error Flag ER ON if the source data is not recognized as floating-point
data.
ON if the source data is not a number (NaN).
ON if the absolute value of the source data exceeds 1.0.
OFF in all other cases.
Equals Flag = ON if both the exponent and mantissa of the result are 0.
OFF in all other cases.
Overflow Flag OF OFF
Underflow Flag UF OFF
Negative Flag N ON if the result is negative.
OFF in all other cases.
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