Mpyf3||subf3 – Texas Instruments TMS320C3x User Manual
Page 616
MPYF3||SUBF3
Parallel MPYF3 and SUBF3
13-158
Status Bits
These condition flags are modified only if the destination register is R7 – R0.
LUF
1 if a floating-point underflow occurs; unchanged otherwise
LV
1 if a floating-point overflow occurs; unchanged otherwise
UF
1 if a floating-point underflow occurs; 0 otherwise
N
0
Z
0
V
1 if a floating-point overflow occurs; 0 otherwise
C
Unaffected
OVM
Operation is not affected by OVM bit value.
Example
MPYF3
R5,*++AR7(IR1),R0
||
SUBF3
R7,*AR3
– –
(1),R2
or
MPYF3
*++AR7(IR1), R5,R0
||
SUBF3
R7,*AR3
– –
(1),R2
Before Instruction
After Instruction
R0
00 0000 0000
R0
04 6718 0000
R2
00 0000 0000
R2
05 E300 0000
R5
03 4C00 0000
R5
03 4C00 0000
R7
07 33C0 0000
R7
07 33C0 0000
AR3
80 98B2
AR3
80 98B1
AR7
80 9904
AR7
80 990C
IR1
8
IR1
8
LUF
0
LUF
0
LV
0
LV
0
UF
0
UF
0
N
0
N
0
Z
0
Z
0
V
0
V
0
C
0
C
0
Data memory
80990Ch
1110000
80990Ch
1110000
8098B2h
70C8000
8098B2h
70C8000
1.79750e+02
1.2750e+01
1.4050e+02
1.4050e+02
2.88867188e+01
–3.9250e+01
2.250e+00
2.250e+00
1.2750e+01
1.79750e+02
Mode Bit