[pwg]

In the never ending quest for yet more performance out of memory systems that are ever slower than the CPU's, this is likely exactly how it happened. The speculative reads, because they were speculative, were likely viewed as harmless (because the instruction that generated the read would never be committed if the speculation missed anyway, so CPU state (registers/flags) would not be changed improperly).

And if anyone even considered the results of the reads, they likely saw them as nothing more than free cache pre-fetch instructions that would enhance performance should the speculative path turn out to be the correct path after-all.

And because the push was for yet more performance, free cache pre-fetch operations were likely viewed as a great bonus.