To issue two instructions simultaneously they must satisfy the following conditions:
i)Both instructions in the pair must be “simple”.

ii)There must be no read-after-write(RAW) or write-after-write register(WAW) dependencies

           RAW:

    i1. R2 <- R1 + R3

            i2. R4 <- R2 + R3

           WAW:

    i1. R2  R4 + R7

        i2. R2  R1 + R3

iii)Neither instruction may contain both a displacement and an immediate

iv)Instruction with prefixes (lock, repne) can only occur in the u-pipe