Sanghoon’s Blog

December 8, 2007

What is the difference between an EQ-model and an LEQ-model VLIW?

Filed under: Research — sanghoon @ 3:37 am

• Equals (EQ) Model: Each operation takes exactly its specified
latency. Register values don’t change until operation completes.
– Reduces register pressure because source operands stay
around longer.
– Can’t reduce operation latencies and maintain source code
compatibility.
• Less-Than-or-Equals (LEQ): Operations may take up to their
specified latency
– Destination register contents become unreliable immediately
– Simplifies implementation of precise interrupts
– Can reduce operation latencies and maintain source code
compatibility

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