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Clarify that UNW_IA64_PR works like the "move predicates" instruction, i.e.,

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it acesses the physical (unrotated) contents of p16-p63.

(Logical change 1.292)
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hp.com!davidm 2005-05-17 13:24:49 +00:00
parent a6ba57d556
commit 0cae8247a8
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doc/libunwind-ia64.tex
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@ -145,8 +145,11 @@ The following normal register name macros are available:
\Const{UNW\_IA64\_BR}\texttt{+6} should be used.
\item[\Const{UNW\_IA64\_PR}:] Contains the set of predicate registers.
This 64-bit wide register contains registers \texttt{p0} through
\texttt{p63} in the ``broad-side'' format (i.e., \texttt{p0}
corresponds to bit 0, \texttt{p1} to bit 1, and so on).
\texttt{p63} in the ``broad-side'' format. Just like with the
``move predicates'' instruction, the registers are mapped as if
\texttt{CFM.rrb.pr} were set to 0. Thus, in general the value of
predicate register \texttt{p}$N$ with $N$>=16 can be found
in bit \texttt{16 + (($N$-16)+CFM.rrb.pr) \% 48}.
\item[\Const{UNW\_IA64\_CFM}:] Contains the current-frame-mask
register.
\end{Description}