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Disclosed is a microinstruction that will save microcode words in a routine that contains a number of tests, all of which branch to the same exit.
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Conditional Return Micro/ Instruction
Disclosed is a microinstruction that will save microcode words in a routine
that contains a number of tests, all of which branch to the same exit.
In some microcode routines it is necessary to do a series of tests before
actual execution of the instruction, or function, can be done. If any of the tests
are failed, execution of the instruction will be terminated.
Fig. 1 is illustrative of this type of routine. Here, now all execution involves
successive execution of microcode control words A, B, C(0), D, E(0), F(l), G, H.
Three tests are specified (at A, C(0), and D), and the results of these tests are
used in the branches at words B, D, E(0), respectively. As Fig. 1 shows, if the
result of TEST1 is ONE, or TEST2 is ONE, or TEST3 is ZERO, then execution is
terminated. Each time such a test is made, the microcode branch requires two
words. One is a useful word (C(0), E(0), F(1)), and the other may serve no other
purpose than to point to an exit. If, as sometimes happens, many tests point to
the same exit, then words like C(1), E(1) and F(0) are all identical. They may
account for 10% or more of the words in a microcode routine.
A new instruction can "free up" words like C(1), E(1), and P(0) by a variation
on the microcode LINK/RETURN mechanism. Such mechanisms today allow a
microorder to set up an address (via a LINK microorder) and later branch to that
address (via a RETURN microorder). This article proposes a conditional return
(CRTN) order. The order w...