Computer Hardware User's Guide

Test Bit Fields, 3-Operand TSTB3
13-247 Assembly Language Instructions
Syntax TSTB3 src2, src1
Operation src1 AND src2
Operands src1 3-operand addressing modes (T):
0 0 register (R n 1, 0 ≤ n 1 ≤ 27)
0 1 indirect (
disp = 0, 1, IR0, IR1)
1 0 register (R n 1, 0 ≤ n 1 ≤ 27)
1 1 indirect ( disp = 0, 1, IR0, IR1)
src2 3-operand addressing modes (T):
0 0 register (R
n 2, 0 ≤ n 2 ≤ 27)
0 1 register (R n 2, 0 ≤ n 2 ≤ 127)
1 0 indirect ( disp = 0, 1, IR0, IR1)
1 1 indirect ( disp = 0, 1, IR0, IR1)
Opcode
31 24 23 16 8 7 015
001 00 1
1 11 T
src 1
00000
src 2
Description The bitwise-logical AND between the src1 and src2 operands is formed but is
not loaded into any register. This allows for nondestructive compares. The
src1 and src2 operands are assumed to be unsigned integers. Although this
instruction has only two operands, it is designated as a 3-operand instruction
because operands are specified in the 3-operand format.
Cycles 1
Status Bits These condition flags are modified for all destination registers (R27–R0).
LUF Unaffected
LV Unaffected
UF 0
N MSB of the output
Z 1 if a 0 output is generated; 0 otherwise
V 0
C Unaffected
OVM Operation is not affected by OVM bit value.Mode Bit