1. L Load Fullword

2. L Instruction type: RX Explicit Coding: R1,D2(X2,B2)
Example L ,3(4,5)
Example L ,TABLE(R7)
Use: The word (4 bytes) at the operand 2 address is loaded into the operand 1 register

3. What does it do? L R8,Y R8 00 12 3D 8A (Before) R8 F5 F6 F7 F8 (After)
Memory F1 F2 F3 F4 F5 F6 F7 F8 F9 Y

4. What does it do? L R8,Y(9) R8 00 12 3D 8A R9 00 00 00 04 R8
(Before) R8
D 8A R9 R8
F6 F7 F8 F9 (After)
Memory F1 F2 F3 F4 F5 F6 F7 F8 F9 Y

5. What does it do? L R7,4(R8,R9) R8 00 00 20 00 R9 00 00 10 00 R7
(Before) R8 R9 R7
FF FF FF FF
(After)
Memory
X’3000’ X’3004’

6. What does it do? L R7,4 R7 12 34 56 78 (Before)
This effective address is 4. Executing this instruction causes a protection exception (SOC 4) since we are referencing storage that is outside of our assigned region.

7. L Example Example use: Assume: TABLE DC F ‘1’ Assume address 1000
You execute:
LA R7,TABLE
L R8,0(R0,R7)
L R9,4(R0,R7)
L R10,8(R0,R7)
R8 After: R9 After: R10 After:

8. Programming Tips
It’s easy to make a simple mistake by coding L for LA or LA for L. Give it a moment’s extra thought when you code these. Do you want an address (LA)? Or do you want the contents at an address (L)?

9. Try it in VisibleZ
Try the following programs:
l.obj
l1.obj
l2.obj