3 ms·

I'll hazard a guess as to what's going on here. The OP mentions the B5000's use of descriptors. I think it's decoding a descriptor and doing bounds checking o

I'll hazard a guess as to what's going on here. The OP mentions the B5000's use of descriptors. I think it's decoding a descriptor and doing bounds checking on every array access. That would certainly slow down a machine that didn't have hardware support for these operations.

tedunangst 14y ago
That's a fairly trivial optimization for a jit to perform. And a 1000x penalty for bounds checking? No way, that would literally require your bounds check to take a minimum of 1000 instructions, even assuming your inner loop didn't do anything meaningful with the accessed value.