e5500 timing when computing with subnormals (denorm)

ricardofranca — Mon, 22 Jul 2024 13:33:05 GMT

Hello,

While playing with single-precision floating-point arith in a T1040, it seemed to me that my algorithms were a little slower when subnormal values were involved. However, I could not find any specifics on subnormal instruction timing in the e5500 reference manual - is this information available anywhere else? Or timing is the same for normalized or subnormal numbers and there is a flaw in my experiment?

Thanks,

Ricardo

Re: e5500 timing when computing with subnormals (denorm)

Oswalag — Wed, 24 Jul 2024 18:31:03 GMT

Hello,

For FPU it says, Counts extra cycles delay due to denormalized inputs. If there is one, this is incremented 4 times, Two operands increments it 5 times. This shows the real penalty due to denorms, not just how often they occur.

topic Re: e5500 timing when computing with subnormals (denorm) in T-Series

e5500 timing when computing with subnormals (denorm)

Re: e5500 timing when computing with subnormals (denorm)