Instruction scheduling
Instruction scheduling In computer science, instruction scheduling is a compiler optimization used to improve instruction-level parallelism, which improves performance on ...
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Very long instruction word
Very long instruction word A Very Long Instruction Word or VLIW CPU architecture implements a form of instruction level parallelism. Similar to superscalar architectures, it ... of execution units is invisible to the instruction set. Each instruction encodes only one operation. For most ...
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Explicitly Parallel Instruction Computing
Explicitly Parallel Instruction Computing Explicitly Parallel Instruction Computing (EPIC) is a computing paradigm that ... the mid-1990s started to re-examine instruction sets which explicitly encode multiple operations per instruction. The basis for such research is VLIW ... multiple functional units are encoded in every instruction. One goal is to move the ...
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CPU design
... CPU architectural innovations include cache, virtual memory, instruction pipelining, superscalar, CISC, RISC, virtual machine, emulators ... a CPU to support a full featured instruction set. Some of these measures conflict. In ... Ferranti Mark I), a return-address saving instruction (UNIVAC I), immediate operands (IBM 704), and ... 360 was a virtual computer, a reference instruction set and capabilities that all machines in ... capable of running the entire System 360 instruction set. For instance a low-end ...
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Central processing unit
... new high-performance designs like SIMD (Single Instruction Multiple Data) vector processors began to appear ... CPU operation Diagram showing how one MIPS32 instruction is decoded. Block diagram of a simple ... The first step, fetch, involves retrieving an instruction (which is represented by a number or ... place in the current program. After an instruction is fetched, the PC is incremented by the length of the instruction word in terms of memory units. ...
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Processors (Pc wiki)
... new high-performance designs like SIMD (Single Instruction Multiple Data) vector processors began to appear ... The first step, fetch, involves retrieving an instruction (which is represented by a number or ... place in the current program. After an instruction is fetched, the PC is incremented by the length of the instruction word in terms of memory units. Often the instruction to be fetched must be retrieved ...
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Compiler optimization
... most a few instructions. They may eliminate instruction sequences that do nothing, e.g. a ... to use the constant 0 in an instruction that sets a register value to a ... up to the compiler to know which instruction variant to use. On many RISC machines ... back from memory. RISC vs. CISC: CISC instruction sets often have variable instruction lengths, often have a larger number ...
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Software pipelining
... B(3) C(3) ... Assume that each instruction takes 3 clock cycles to complete (ignore ... case on most modern systems) that an instruction can be dispatched every cycle, as long ... it is has no dependencies on an instruction that is already executing. In the unpipelined ... It can be easily verified that an instruction can be dispatched each cycle, which means ... be unrolled to avoid the bottleneck of instruction C . This means that the code ...
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Multiflow
... Technology roots The VLIW (for Very Long Instruction Word) design style was first proposed by ... 1981. VLIW was motivated by a compiler scheduling technique, called trace scheduling , that Fisher had developed as a graduate ... of New York University in 1978. Trace scheduling, unlike any prior compiler technique, exposed significant quantities of instruction-level parallelism (ILP) in ordinary computer ...
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Register renaming
... distinguish them from one another. A typical instruction might say, add X and Y and ... put the result in Z. In this instruction, X, Y, and Z are the names ... locations. In order to have a compact instruction encoding, most processor instruction sets have a small set of special ... be directly named. For example, the x86 instruction set architecture has 8 integer registers, ...
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