News for hackers. Stuff that matters.

A comment on The iPhone XS and XS Max Review: Unveiling the Silicon Secrets. Parent comment

Re:The iPhone XS and XS Max Review: Unveiling the Silicon Se... by rayiner on Friday October 05, 2018 @02:22PM (#18150453)
It's true that decoding x86 is harder, but Sandy Bridge+ get most instructions from a uop cache, which delivers 4 fixed-length uops per cycle. You could make that 6 wide, but Intel doesn't because they wouldn't be able to fill that.
[ Parent | on HN ]
Re:The iPhone XS and XS Max Review: Unveiling the Silicon Se... by pcwalton on Friday October 05, 2018 @03:12PM (#18150913)
AArch64 has a larger register file and fewer dependencies in general than x86-64 does. For example, most instructions don't set flags. I don't know for sure, but that might be enough to raise the ILP sufficiently.
[ Parent | on HN ]