The Essentials ofComputer(computer) 445

The Essentials ofComputer(computer) 445 - As a VLIW...

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As a VLIW compiler creates very long instructions, it also arbitrates all dependencies. The instructions, which are fixed at compile time, typically contain four to eight instructions. Because the instructions are fixed, any modification that could affect scheduling of instructions (such as changing memory latency) requires a recompilation of the code, potentially causing a multitude of problems for software vendors. VLIW supporters point out that this technology simplifies the hardware by moving complexity to the compiler. Superscalar supporters counter with the argument that VLIW can, in turn, lead to significant increases in the amount of code generated. For example, when program control fields are not used, memory space and bandwidth are wasted. In fact, a typical FORTRAN pro- gram explodes to double and sometimes triple its normal size when compiled on a VLIW machine. Intel’s Itanium, IA-64, is one example of a VLIW processor. Recall that the IA-64 uses an EPIC style of VLIW processor. An EPIC architecture holds some
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