Fgetman extract the mantissa fgetman – Motorola DSP96002 User Manual
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DSP96002 USER’S MANUAL
MOTOROLA
FGETMAN
Extract the Mantissa
FGETMAN
Operation:
Normalized mantissa of S
→
D
(parallel data bus move)
Assembler Syntax:
FGETMAN S,D (move syntax - see the MOVE in-
struction description.)
Description:
Extract the mantissa and sign of the floating-point operand S, normalizes the mantissa, forces the expo-
nent to "ebias" so the result is in the range 1-2, and stores the result as a floating-point value in the spec-
ified destination D regardless of whether the mantissa is denormalized or not.
As an example of the use of FGETMAN, GETEXP, and FSCALE; consider decomposing a floating-point
number into its mantissa and unbiased exponent and then recreating the original floating-point number.
FGETMAN
D0, D1
;extract normalized mantissa
GETEXP
D0,D2
;extract unbiased exponent
MOVE
D2.L, D2.H
;move unbiased exponent
FSCALE.X
D2.H, D1
;scale original mantissa
Input (SEP)
Output (SEP)
-infinity
NaN, signals OPERR
negative, non-zero
signed mantissa
-0.0
-0.0
+0.0
+0.0
positive, non-zero
signed mantissa
+infinity
NaN, signals OPERR
NaN
NaN
Input Operand(s) Precision: SEP Floating-Point.
Output Operand Precision: SEP Floating-Point.