From e9ccab5308d2b6fec79e36c355c03aad4e1e5dec Mon Sep 17 00:00:00 2001 From: Hans Hagen Date: Sun, 4 Jun 2023 19:46:50 +0200 Subject: 2023-06-04 16:40:00 --- .../manuals/luametatex/luametatex-enhancements.tex | 32 ++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'doc/context/sources/general/manuals/luametatex/luametatex-enhancements.tex') diff --git a/doc/context/sources/general/manuals/luametatex/luametatex-enhancements.tex b/doc/context/sources/general/manuals/luametatex/luametatex-enhancements.tex index ba320440b..0cafa118f 100644 --- a/doc/context/sources/general/manuals/luametatex/luametatex-enhancements.tex +++ b/doc/context/sources/general/manuals/luametatex/luametatex-enhancements.tex @@ -2512,6 +2512,38 @@ Unit equivalent to ten Toves or one Edith. \stopsection +\startsection[title=Registers] + + +\startsubsection[title={32 bit floats}] + +The engine has native float registers which means that we have a similar set of +primitives as for dimensions and integers: \prm {float}, \prm {floatdef}, \prm +{floatexpr} and \prm {iffloat}. In the context if an integer a rounded value is +used, in the context of a dimensions the floating point number is interpreted as +points. Internally floats are stored as so called posits, which gives more accuracy +for smaller values. + +\stopsubsection + +\startsubsection[title={32 bit posits}] + +{\em This is a playground. It will stay but might evolve.} + +\stopsubsection + +\startsubsection[title={Extra features}] + +There are \prm {ifabsnum}, \prm {ifabsdim} and \prm {ifabsfloat} that compare +absolute values of quantities. The primitives \prm{ifzeronum}, \prm{ifzerodim}, +\prm{ifzerofloat} do a fast test for zero. The \prm {ifintervalnum}, \prm +{ifintervaldim} and \prm {ifintervalfloat} primitives take a delta and two values +and check if these values overlap within the ranges dedicated by the delta. + +\stopsubsection + +\stopsection + \startsection[title=Expressions] \startsubsection[title={Rounding and scaling}] -- cgit v1.2.3