Branch Mnemonic Opcodes
Assembler Branch Instructions
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This document provides a summary of the extended mnemonic opcodes for branch instructions. This program may serve as a tutorial for programmers that are new to 370 assembler or as a reference for experienced programmers. In the following tables the leftmost three columns show the mnemonic with the operands and a brief description. The rightmost three columns show the instruction format, the actual mnemonic opcode and the mask and addressing format that is generated from the extended mnemonic.
Note: D2=displacement, X2=index register, B2=base register, R2=register containing branch address
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The following mnemonic opcodes are used for an Unconditional Branch or No Branch.
The following mnemonic opcodes are used after Compare Instructions.
|BH||D2(X2,B2)||Branch on High||RX||BC||2,D2(X2,B2)|
|BL||D2(X2,B2)||Branch on Low||RX||BC||4,D2(X2,B2)|
|BE||D2(X2,B2)||Branch on Equal||RX||BC||8,D2(X2,B2)|
|BNH||D2(X2,B2)||Branch on Not High||RX||BC||13,D2(X2,B2)|
|BNL||D2(X2,B2)||Branch on Not Low||RX||BC||11,D2(X2,B2)|
|BNE||D2(X2,B2)||Branch on Not Equal||RX||BC||7,D2(X2,B2)|
The following mnemonic opcodes are used after Arithmetic Instructions.
|BP||D2(X2,B2)||Branch on Plus||RX||BC||2,D2(X2,B2)|
|BM||D2(X2,B2)||Branch on Minus||RX||BC||4,D2(X2,B2)|
|BZ||D2(X2,B2)||Branch on Zero||RX||BC||8,D2(X2,B2)|
|BO||D2(X2,B2)||Branch on Overflow||RX||BC||1,D2(X2,B2)|
|BNP||D2(X2,B2)||Branch on Not Plus||RX||BC||13,D2(X2,B2)|
|BNM||D2(X2,B2)||Branch on Not Minus||RX||BC||11,D2(X2,B2)|
|BNZ||D2(X2,B2)||Branch on Not Zero||RX||BC||7,D2(X2,B2)|
|BNO||D2(X2,B2)||Branch on No Overflow||RX||BC||14,D2(X2,B2)|
The following mnemonic opcodes are used after Test Under Mask Instructions.
|BO||D2(X2,B2)||Branch if Ones||RX||BC||1,D2(X2,B2)|
|BM||D2(X2,B2)||Branch if Mixed||RX||BC||4,D2(X2,B2)|
|BZ||D2(X2,B2)||Branch if Zero||RX||BC||8,D2(X2,B2)|
|BNO||D2(X2,B2)||Branch if Not Ones||RX||BC||14,D2(X2,B2)|
|BNM||D2(X2,B2)||Branch if Not Mixed||RX||BC||11,D2(X2,B2)|
|BNZ||D2(X2,B2)||Branch if Not Zero||RX||BC||7,D2(X2,B2)|
This document provides a summary of the extended mnemonic opcodes for branch instructions. This document may be used to assist as a tutorial for new programmers or as a quick reference for experienced programmers.
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|Branch Instructions - Extended Mnemonic Opcodes|
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