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@@ -2120,9 +2120,11 @@ Program SaturationDemo;
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example for saturation, scales data (for example audio)
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with 1.5 with rounding to negative infinity
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}
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+uses mmx;
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var
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audio1 : tmmxword;
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+ i: smallint;
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const
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helpdata1 : tmmxword = ($c000,$c000,$c000,$c000);
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@@ -2132,13 +2134,15 @@ begin
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{ audio1 contains four 16 bit audio samples }
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{$mmx+}
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{ convert it to $8000 is defined as zero, multiply data with 0.75 }
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- audio1:=tmmxfixed16(audio1+helpdata2)*tmmxfixed(helpdata1);
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+ audio1:=(audio1+helpdata2)*(helpdata1);
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{$saturation+}
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{ avoid overflows (all values>$7fff becomes $ffff) }
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audio1:=(audio1+helpdata2)-helpdata2;
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{$saturation-}
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{ now mupltily with 2 and change to integer }
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- audio1:=(audio1 shl 1)-helpdata2;
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+ for i:=0 to 3 do
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+ audio1[i] := audio1[i] shl 1;
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+ audio1:=audio1-helpdata2;
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{$mmx-}
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end.
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\end{verbatim}
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@@ -2179,7 +2183,18 @@ check this, so you are responsible for this!
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\section{Supported MMX operations}
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\label{se:SupportedMMX}
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-{\em Still to be written \dots}
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+The following operations are supported in the compiler when MMX
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+extensions are enabled:
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+
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+\begin{itemize}
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+\item addition (\var{+})
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+\item subtraction (\var{-})
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+\item multiplication(\var{*})
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+\item logical exclusive or (\var{xor})
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+\item logical and (\var{and})
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+\item logical or (\var{or})
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+\item sign change (\var{-})
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+\end{itemize}
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\section{Optimizing MMX support}
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\label{se:OptimizingMMX}
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@@ -5237,6 +5252,7 @@ Not all the flags are described, for more information, read the source code of
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\begin{FPCltable}{|ll|}{PPU Header Flag values}{PPUHeaderFlags}
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\hline
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Symbolic bit flag name & Description\\
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+\hline
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uf\_init & Module has an initialization (either Delphi or TP style) section. \\
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uf\_finalize & Module has a finalization section. \\
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uf\_big\_endian & All the data stored in the chunks is in big-endian format.\\
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@@ -5298,6 +5314,7 @@ description of the most common ones are shown in \seet{PPUEntryTypes}.
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\begin{FPCltable}{|lll|}{Possible PPU Entry types}{PPUEntryTypes}
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\hline
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Symbolic name & Location & Description\\
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+\hline
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ibmodulename & General & Name of this unit.\\
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ibsourcefiles & General & Name of source files.\\
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ibusedmacros & General & Name and state of macros used.\\
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carl