Computer Hardware User's Guide

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