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The assembler syntax closely follows the syntax outlined in Enterprise Systems Architecture/390 Principles of Operation (SA22-7201) and the z/Architecture Principles of Operation (SA22-7832).
Each instruction has two major parts, the instruction mnemonic and the instruction operands. The instruction format varies.
| • s390 Register | Register Naming | |
| • s390 Mnemonics | Instruction Mnemonics | |
| • s390 Operands | Instruction Operands | |
| • s390 Formats | Instruction Formats | |
| • s390 Aliases | Instruction Aliases | |
| • s390 Operand Modifier | Instruction Operand Modifier | |
| • s390 Instruction Marker | Instruction Marker | |
| • s390 Literal Pool Entries | Literal Pool Entries |