Conditional branch

Whereas conditional branches often destroy parallelism in more traditional computers (13), the Multiflow employed several strategies for dealing with branches. With the code fragment below, most traditional computers would need to wait until the comparison withM was complete before beginning evaluation oiD = E + F. 

Perhaps the most unusual aspect of the compiler is that it would make compile time decisions about the most likely outcome of a comparison operation and generate code to foUow that most likely path. The compiler would insert compensation code to undo calculations already done if the branch were other than predicted. In addition, it was possible to execute a program and monitor the results of branch decisions. Armed with more accurate information about the likely outcome of conditional branches, the compiler could then generate better code, because its "guesses" would be correct more often. 

Executable statements affecting the order in which the program instructions are executed include conditional (branching) statements, iterative (looping) statements, and statements which call subprogram units. 

Ovenall and Uschold215 have recently measured the concentration of branch points (tertiary F, Scheme 6.32) in PVF by, 9F NMR. These were found to account for between 0.5 to 1.5% of monomer units depending on reaction conditions. Branching was found to be favored by lower reactor pressures or higher reactor temperatures. More branching was observed for polymers produced in batch as opposed to continuous reactors. This effect was attributed to longer residence time of the polymer in the reactor. 

If a variable is assigned and used within a conditional branch, no latch is necessary as shown in the following module. This is because the value of variable Temp need not be saved between level changes of Clock. 

Conditional branching structures should always bear a default clause to cater for situations outside the progranuner s conception. This clause should cause the program to terminate gracefully. In this way the unexpected termination of the program in an undefined state can be engineered out and avoided. 

Conditional branchings are modeled by attaching conditions to the outgo-... 

In general, design decisions are too complex to be represented by a set of conditional branchings in a work process. Instead, a modeling approach tailored to decision modeling should by pursued (cf. Sect. 2.5). 

Pipelines start with an input module that sources an initial dataset. The remainder of the pipeline consists of analysis, transformation, or conditional filter modules. The designer can insert visualization modules to view and filter the data content at any point. The dataset passes to successive modules in the workflow and may be cloned to multiple outputs or conditionally branched as it passes through the workflow. 

Solubilizing and stabilizing ability. Branched-CDs have better water solubility and can form soluble inclusion complex. The commercial branched-CDs-essence inclusion complex is stable at 90°C for 7 h without damages whereas only 45% of essence in the CDs-essence complex remains at the same condition. Branched-CDs-fatty acid complex, which improves the solubility of fatty acid in water, can be apphed in serum-lfee culture for animal cell and cancer cell. 

There may, in addition, be conditional branches in the process which only occur under certain circumstances, the medication is contraindicated, the patient is absent when the medication needs to be administered, etc. The processes can usually be mapped out quite easily using nse case diagrams, flow charts, user stories or other tools. What is key when looking at the clinical bnsiness process is that the steps are agnostic abont the tools which are nsed to achieve the objective, i.e. whether a particular electronic solntion is ntilised, paper systems or by some other means. The processes remain entirely in the clinical domain without any mention of screens, interfaces, data or hardware. 

Our work is substantially different from the previous work. First, we support different execution schemes such as lockstepped execution and implicit multithreading, switching the context with each latency. Latencies can be memory accesses and conditional branches. We assume two redundant instruction streams, ideally executing on a Simultaneous Multithreaded (SMT) [17] processor. With simple methods, faults can be detected [18]. Note that we do not deal with the detection of faults. Thus, our work is completely different from the work of Austin [15][16]. Austin uses a master-checker model to detect permanent and design faults. Our work solely handles the recovery from transient faults. Furthermore, Austin dedicates a whole additional checker processor to do the work. We use different parts within an existing SMT processor and additional registers. 

K. Wakabayshi and T. Yoshimura. A resource sharing and control synthesis method for conditional branches. In Proc. of the ICCAD, Santa Clara, pages 62-65, 1989. 

R. Emenwein, M. Benard, and I. Shavitt, Vectorizing a Sequence of Conditional Branches the Calculation of the Class Index of Two-Electron Repulsion Integrals on Cray Computers, Comput. Phys. Com-mun. 48, 175-180 (1988). 

The method described here of separating the data and control flow is only one of a variety of ways that high-level synthesis systems represent this information. Some systems choose to represent the operations only once, mixing both graphs. Other systems preserve only the essential parts of the control flow, such as loops and conditional branches. For example, the ordering of operations 5 and 6 is not relevant, since they are not data dependent, so that ordering does not have to be stored. Unfortunately, such mixed data/control flow representations are also occasionally called data-flow representations, which creates some confusion. For didactical purposes, we have chosen to separate data flow and control flow in this book. 

We finally review scheduling methods which put more emphasis on conditional branching. The main idea of these algorithms is to schedule mutually exclusive operations to allow sharing of hardware, and possibly a faster schedule for some paths in the control flow graph. 

K. Wakabayashi and T. Yoshimura, A Resource Sharing Control Synthesis Method for Conditional Branches, ICCAD 89, pp. 62-65, Santa Clara, CA, November 1989. 

Maps operations onto functional units, and minimizes the total execution time of expressions using associativity and commutativity. Shares functional units among mutually exclusive conditional branches, inserting multiplexors as necessary. 

Sharing functional units between mutually exclusive conditional branches. 

Initially, all operations are assigned to separate a single control step, lliis step is then split at statements that are destinations of (K)TOs, after conditional branch statements, and whenever a variable receives a second value in a given control step. 

Since these components are not state machines, control step scheduling is not applicable. Since all variables must be stored in registers, register merging is not applicable. Since there is only a single state , functional units are not shared between states. However, functional units can be shared between conditional branches, and expressions can be reduced. 

As described in Chapter 2, in ISPS, IF operations are used for conditional branching, and DECODE operations are used for CASE-like decoding. Both of these operations are mapped onto the VT SELECT operation. This SELECT operation decodes a value (called a selector), and based on the decoded value chooses one of a set of alternate branches for execution associated with each branch is a set of activation values that must contain the selector for the branch to be chosen. At any given time, only a single branch of the SELECT can be active. 

Can one specify dont care conditions for the condition branches of a case statement Solution... 

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