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Very long instruction word (VLIW) refers to instruction set architectures that are designed to exploit instruction-level parallelism (ILP). A VLIW processor allows programs to explicitly specify instructions to execute in parallel, whereas conventional central processing units (CPUs) mostly allow programs to specify instructions to execute in sequence only.
VLIW (at least the original forms) has several short-comings that precluded it from becoming mainstream: VLIW instruction sets are not backward compatible between implementations. When wider implementations (more execution units) are built, the instruction set for the wider machines is not backward compatible with older, narrower implementations.
The VLIW core can execute a 256-bit VLIW instruction per cycle, which is called a molecule, and has room to store eight 32-bit instructions (called atoms) per cycle. The Efficeon has a 128 KB L1 instruction cache, a 64 KB L1 data cache and a 1 MB L2 cache. All caches are on die.
The VLIW core could execute a 256-bit VLIW instruction per cycle. A VLIW is called a molecule and has room to store eight 32-bit instructions (called atoms) per cycle. The Efficeon had a 128-KB L1 instruction cache, a 64-KB L1 data cache and a 1-MB L2 cache. All caches were on die.
The ST200 is a family of very long instruction word (VLIW) processor cores based on technology jointly developed by Hewlett-Packard Laboratories and STMicroelectronics under the name Lx. The main application of the ST200 family is embedded media processing.
Trace scheduling was originally developed for Very Long Instruction Word, or VLIW machines, and is a form of global code motion. It works by converting a loop to long straight-line code sequence using loop unrolling and static branch prediction. This process separates out "unlikely" code and adds handlers for exits from trace.
The VLIW (for Very Long Instruction Word) design style was first proposed by Joseph A. (Josh) Fisher, a Yale University computer science professor, during the period 1979-1981. VLIW was motivated by a compiler scheduling technique, called trace scheduling , that Fisher had developed as a graduate student at the Courant Institute of Mathematical ...
A wide-issue architecture is a computer processor that issues more than one instruction per clock cycle. [1] They can be considered in three broad types: Statically-scheduled superscalar architectures execute instructions in the order presented; the hardware logic determines which instructions are ready and safe to dispatch on each clock cycle.