Von Neumann showed how the combination of instructions and data in one memory could be used to implement loops, by modifying branch instructions when a loop was completed, for example.
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Branch instructions are used to implement control flow in program loops and conditionals ( i . e ., executing a particular sequence of instructions only if certain conditions are satisfied ).
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In most processors, the zero flag is mainly used in conditional branch instructions, which alter control flow on previous instruction results, but there are often other uses as well.
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Although the PA-8000 can execute two branch instructions per cycle, only one of the outcomes is recorded as the BHT is not dual-ported to simplify its implementation.
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For example, a branch instruction's target may be indexed by W, and execute a " RETLW ", which does as it is named return with literal in W.
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There can be'side effects', or known usage, when performing a short branch and the short branch instruction or the address byte is the last byte on the page.
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Branch instructions which examine the carry flag are often represented by mnemonics such as BCC and BCS to branch if the carry is clear, or branch if the carry is set respectively.
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Many RISC designs have included a branch delay slot, a position after a branch instruction that can be filled with an instruction which is executed whether or not the branch is taken.
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For example, within an unconditional branch instruction ( X'47F0Fxxx'), the xxx 12bit hexadecimal offset provided the byte offset from the base register ( 15 ) to branch to.
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Although quite compact-compared to the multiple equivalent If statements-the branch instructions still carry some redundancy, since the branch opcode and condition code mask are repeated alongside the branch offsets.
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