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DSP96002 USER’S MANUAL
MOTOROLA
FCMP
Compare Two
FCMP
Floating-Point Operands
Operation:
S2 - S1 (parallel data bus move)
Assembler Syntax:
FCMP S1,S2 (move syntax - see the MOVE in-
struction description.)
Description:
Subtract the two operands as specified in the operation column above. No result is stored; however, the
condition codes are affected as described. This instruction differs from FSUB when S1=S2; in this case,
the result is 0 and therefore, N is cleared. Note that this is true even if S1, S2 are infinity.
Input Operand(s) Precision: SEP Floating-Point.
Output Operand Precision: n.a.
CCR Condition Codes:
(Note: Since there is no destination, there is no rounding and therefore the condition code bits are set as-
suming an infinite precision result)
C
- Not affected.
V
- Not affected.
Z
- Set if source operands are equal. Cleared otherwise.
N
- Set if result is negative. Cleared otherwise.
I
- Set if anyone of the operands is infinity. Cleared otherwise.
LR
- Cleared if result is positive, zero or NaN (if cleared first, print accepted; see the FC-
MPG example). Not affected otherwise.
–
R
- Cleared if result is a NaN. Not affected otherwise.
A
- Cleared if result is a NaN. Cleared if result is negative and not zero. Not affected
otherwise.
ER Status Bits:
INX
-Always cleared.
DZ
-Always cleared.
UNF
-Always cleared.
OVF
-Always cleared.
OPERR-Always cleared.
SNAN -Set if operand is a signaling NaN. Cleared otherwise.
NAN
-Set if result is a NaN. Cleared otherwise.
UNCC -Always cleared.
IER Flags: Flags changed according to standard definition.
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 ...
Page 53: ...4 14 DSP96002 USER S MANUAL MOTOROLA ...
Page 76: ...MOTOROLA DSP96002 USER S MANUAL 5 23 Figure 5 8 Address Modifier Summary ...
Page 86: ...6 10 DSP96002 USER S MANUAL MOTOROLA ...
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 404: ...A 216 DSP96002 USER S MANUAL MOTOROLA PC xxxx D ...
Page 460: ...A 272 DSP96002 USER S MANUAL MOTOROLA SIOP Not affected ...
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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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