- #CODEBOX INSTRUCTIONS HOW TO#
- #CODEBOX INSTRUCTIONS GENERATOR#
- #CODEBOX INSTRUCTIONS CODE#
- #CODEBOX INSTRUCTIONS PASSWORD#
#CODEBOX INSTRUCTIONS PASSWORD#
You will create your own user ID and password for SAW. You could think of it as instructions 'vectoring' through the FPU pipeline, but more properly these days, the technique is called 'functional interleaving.
#CODEBOX INSTRUCTIONS CODE#
That is, originally this was an optimization for supercomputer vector units performing array processing, but it applies just as much to any code optimization for pipelined instructions. That's just a specific example of the general paradigm of 'vector optimization' that applies throughout floating-point optimization. So if you have other stuff to do, it's good practice to put that immediately after the selector clause. But It will take the CPU some time to evaluate the selector statement, during which the variable "osc1" won't be available yet. So the param statement only gets evaluated infrequently, and the ramp is faster as a result. As noted above, the first part evaluated in a ternary test should be the least-frequent result, so as the trigger is relatively rare, the reset to zero should precede the more frequently expected ramp-value calculation. Ternary operators are thus the most desirable form of all conditional tests. If there isn't a sync signal, the processor has already assumed a false result and started evaluating the ramp, so the sync ramp causes absolutely zero performance penalty, aside from a few extra instructions for the conditional branch and constant, compared to the first example. This allows the CPU prefetch mechanism to preload the operand, in this case a static variable, while the condition is being evaluated, and still use it regardless the condition's outcome.
#CODEBOX INSTRUCTIONS GENERATOR#
Because microprocessors still have trouble doing much better than false-branch predictive preprocessing, it is good practice to put the code for the most commonly expected results of a test in its false, or failure, branch, as I will illustrate in the second ramp generator example below.Īgain this hardly requires a dedicated method, and the above ternary operation to determine if the ramp should be reset is also one of the most efficient CPU operations, because it is a binary condition with the result operand already called before the condition is evaluated. The technique proved to be the design's greatest performance improvement over the 80486, and aside from cost-optimized notepads and phones, it has become a standard implementation in all modern general-purpose CPU architectures. There was some debate, once upon a time, about whether the processor would be better doing other things, but proof of the unexpectedly large benefit of false-branch execution was my tiny contribution to the Pentium I's superscalar architecture when I worked for Intel way back in 1994. Thus they start evaluating code assuming a negative result while the condition is still being evaluated, then discard that processing if the conditional test proves to have a positive result instead.
Īll desktop and laptop CPUs in current usage accelerate processing by expecting the conditional test to fail, because that is the most common result of conditions in loop tests. Applying gen to MIDI and real-world cases.Programming pattrstorage with JavaScript:.JavaScript: the Oddest Programming Language:.
#CODEBOX INSTRUCTIONS HOW TO#
So this tutorial describes how to make a very efficient, simple, multiple-waveform LFO, with particular reference to optimizing conditional tests, function calls, and a little-known pipeline optimization technique based on vector optimization for supercomputers.
Most of what I describe will be applicable to virtually any gen~ design, but at least I can make it more interesting by providing something you might actually want anyway, in what otherwise might be very dry reading. I get alot of questions about codebox, so before releasing Husserl3 I am writing a tutorial series describing, first, oscillators.
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