Apparently IEEE-754 guarantees bit-identical (≤½ ulp error) results for +, -, ×, ÷, and √ — but only those? Do processors usually comply?
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oh man. apparently due to the introduction of FMA, even a*a+b can now produce non-bit-identical results "correctly".
reasonable compilers let you disable FMAs. If I got it right, NVIDIA's won't, gives you intrinsics for non-fused MACs. Painful!
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I'm trying to do something far less practical than what you are imagining
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I want to define a general-purpose archival virtual machine that will be easy to implement from spec compatibly in, say, 2116
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