zlacker

[parent] [thread] 4 comments
1. mhast+(OP)[view] [source] 2025-12-03 22:57:15
Jim Keller goes into some detail about what difference the ISA makes in general in this clip https://youtu.be/yTMRGERZrQE?si=u-dEXwxp0MWPQumy

Spoiler, it's not much because most of the actual execution time is spent in a handful of basic OPs.

Branch prediction is where the magic happens today.

replies(2): >>snvzz+Jr >>IshKeb+fd1
2. snvzz+Jr[view] [source] 2025-12-04 02:40:51
>>mhast+(OP)
>Spoiler, it's not much because most of the actual execution time is spent in a handful of basic OPs.

Yet, on a CISC ISA, you still have to support everything else, which is essentially cruft.

replies(1): >>devnul+4c2
3. IshKeb+fd1[view] [source] 2025-12-04 10:50:04
>>mhast+(OP)
Jim Keller has to say that.
replies(1): >>bigyab+224
◧◩
4. devnul+4c2[view] [source] [discussion] 2025-12-04 17:04:22
>>snvzz+Jr
Does that matter? I lean towards the yes-the-ISA-matters camp, but I'm also under the impression that most silicon is dark.
◧◩
5. bigyab+224[view] [source] [discussion] 2025-12-05 04:53:50
>>IshKeb+fd1
The stage is yours if you choose to refute him.
[go to top]