Motorola DSP96002 - Manual (Page 306)

A - 118 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.