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Kartik K. Agaram 2021-09-13 04:53:38 -07:00
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linux/x86_approx.md
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@ -110,6 +110,8 @@ the fourth decimal place.
Among the x86 instructions Mu supports, two are described in the Intel manual
as "approximate": `reciprocal` (`rcpss`) and `inverse-square-root` (`rsqrtss`).
Intel introduced these instructions as part of its SSE expansion in 1999. When
it upgraded SSE to SSE2 (in 2000), most of its single-precision floating-point
instructions got upgraded to double-precision — but not these two. So
they seem to be an evolutionary dead-end.
it upgraded SSE to SSE2 (in 2000), most of its scalar[1] single-precision
floating-point instructions got upgraded to double-precision — but not
these two. So they seem to be an evolutionary dead-end.
[1] Thanks boulos for feedback: https://news.ycombinator.com/item?id=28501429#28507118