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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.
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.
In very long instruction word (VLIW) architectures, which include many microcode architectures, multiple simultaneous opcodes and operands are specified in a single instruction. Some exotic instruction sets do not have an opcode field, such as transport triggered architectures (TTA), only operand(s).
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 Fujitsu FR-V (Fujitsu RISC-VLIW) is one of the very few processors ever able to process both a very long instruction word (VLIW) and vector processor instructions at the same time, increasing throughput with high parallel computing while increasing performance per watt and hardware efficiency. The family was presented in 1999. [1]
The first TriMedia was created in 1987 under the name LIFE-1 VLIW processor by Gerrit Slavenburg and Junien Labrousse. For the next several years LIFE was further matured internally in Philips under guidance of Gerrit Slavenburg, which resulted in 1996 in the introduction of the first Trimedia product: the TM1000 PCI Media Processor (introduced as TM-1 [1]).
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.
The short-pipeline, in-order, three-issue cores implement a MIPS-inspired [2] VLIW instruction set. Each core has a register file and three functional units: two integer arithmetic logic units and a load–store unit. Each of the cores ("tile") has its own L1 and L2 caches plus an overall virtual L3 cache which is an aggregate of all the L2 ...