Computer Hardware User's Guide

NORM Normalize
13-182
Syntax NORM src, dst
Operation norm ( src ) → dst
Operands src general addressing modes (G):
0 0 register (R n , 0 ≤ n ≤ 7)
0 1 direct
1 0 indirect (disp = 0–255, IR0, IR1)
1 1 immediate
Opcode
31 24 23 16 8 7 015
00 0 01 1
0 01
dst src
G
Description The src operand is assumed to be an unnormalized floating-point number; that
is, the implied bit is set equal to the sign bit. The
dst is set equal to the normal-
ized src operand with the implied bit removed. The dst operand exponent is
set to the src operand exponent minus the size of the left shift necessary to
normalize the src . The dst operand is assumed to be a normalized floating-
point number.
If src (exp ) = –128 and src (man ) = 0, then dst = 0, Z = 1, and UF = 0.
If src ( exp ) = –128 and src ( man ) ≠ 0, then dst = 0, Z = 0, and UF = 1.
For all other cases of the src, if a floating-point underflow occurs, then
dst (man ) is forced to 0 and dst (exp ) = –128.
If src (man ) = 0, then dst (man ) = 0 and dst (exp ) = –128.
Refer to Section 5.7, Normalization Using the NORM Instruction , on page 5-37
for more information.
Cycles 1
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 Unaffected
UF 1 if a floating-point underflow occurs; 0 otherwise
N 1 if a negative result is generated; 0 otherwise
Z 1 if a 0 result is generated; 0 otherwise
V 0
C Unaffected
OVM Operation is not affected by OVM bit value.
Mode Bit