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331 points giuliomagnifico | 1 comments | 25 Sep 25 18:09 UTC | HN request time: 0s | source

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tverbeure ◴[25 Sep 25 21:25 UTC] No.45379324[source]▶

About this part:

> In 2004, Intel wrote off the Itanium and cloned AMD64.

AMD introduced x86-64 in 2003. You don't just clone an ISA (even if based on AMD documents), design it, fab it etc. in a year or two. Intel must have been working on this well before AMD introduced the Athlon64.

replies(1): >>45379569 #

mjg59 ◴[25 Sep 25 21:47 UTC] No.45379569[source]▶

>>45379324 #

The ISA was published in 2000, there was plenty of time to start working on an implementation before AMD shipped actual product.

replies(1): >>45381817 #

1. tverbeure ◴[26 Sep 25 02:10 UTC] No.45381817[source]▶

>>45379569 #

Thanks! I didn’t know AMD published it that early, but that makes much more sense then Intel “cloning” it as a reactive move to Athlon64 having it.

(Though you could certainly make the case that it was reactive move by Intel marketing to enable it.)

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Athlon 64: How AMD turned the tables on Intel