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DSP96002 USER’S MANUAL
MOTOROLA
GETEXP
Extract Exponent
GETEXP
Operation:
Exponent(S)
→
D.L (parallel data bus move)
Assembler Syntax:
GETEXP S,D
(move syntax - see the Move instruction description.)
Description:
Extract the exponent of the single extended precision floating-point operand S and store it as an unbiased,
2’s complement, 32-bit integer in the low portion of D . The exponent value is decremented by the number
of shifts needed to normalize the mantissa if the floating-point number was denormalized.
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.S
D2.H, D1
;scale original mantissa
The following table lists the results for some special cases:
Source operand
Result
+/- infinity
$7FFFFFFF
+/- zero
$80000000
SNaN or QNaN
$FFFFFFFF
Input Operand(s) Precision: SEP Floating-Point.
Output Operand Precision: 32-bit integer.
CCR Condition Codes:
C
- Not affected.
V
- Not affected.
Z
- Set if result is zero. Cleared otherwise.
N
- Set if result is negative. Cleared otherwise.
I
- Set if the source operand is infinity. Cleared otherwise.
LR
- Not affected.
–
R
- Not affected.
A
- Not affected.
Summary of Contents for DSP96002
Page 3: ...1 2 DSP96002 USER S MANUAL MOTOROLA ...
Page 38: ...MOTOROLA DSP96002 USER S MANUAL 3 15 Figure 3 4 Modulo Arithmetic Unit Block Diagram ...
Page 39: ...3 16 DSP96002 USER S MANUAL MOTOROLA ...
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Page 76: ...MOTOROLA DSP96002 USER S MANUAL 5 23 Figure 5 8 Address Modifier Summary ...
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Page 101: ...MOTOROLA DSP96002 USER S MANUAL 7 15 Figure 7 9 HI Block Diagram One Port ...
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Page 181: ...MOTOROLA DSP96002 USER S MANUAL 10 15 Figure 10 8 Program Address Bus FIFO ...
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Page 871: ... MOTOROLA INC 1994 MOTOROLA TECHNICAL DATA SEMICONDUCTOR M Addendum ...
Page 888: ...MOTOROLA INDEX 1 INDEX ...
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