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Removed old doc references to $safe_pmux

This commit is contained in:
Clifford Wolf 2014-08-15 14:04:35 +02:00
parent ca87116449
commit bf486002d9
2 changed files with 1 additions and 5 deletions
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4
manual/CHAPTER_CellLib.tex
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@ -125,10 +125,6 @@ than one bit from \B{S} is set the output is undefined. Cells of this type are u
``parallel cases'' (defined by using the {\tt parallel\_case} attribute or detected by ``parallel cases'' (defined by using the {\tt parallel\_case} attribute or detected by
an optimization). an optimization).
The {\tt \$safe\_pmux} behaves similarly to the {\tt \$pmux} cell type. But when more than one bit
of \B{S} is set, it is guaranteed that this cell type will output the value of the \B{A} input instead of
an undefined value.
Behavioural code with cascaded {\tt if-then-else}- and {\tt case}-statements Behavioural code with cascaded {\tt if-then-else}- and {\tt case}-statements
usually results in trees of multiplexer cells. Many passes (from various usually results in trees of multiplexer cells. Many passes (from various
optimizations to FSM extraction) heavily depend on these multiplexer trees to optimizations to FSM extraction) heavily depend on these multiplexer trees to

2
manual/CHAPTER_Optimize.tex
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@ -136,7 +136,7 @@ This pass performs trivial resource sharing. This means that this pass identifie
with identical inputs and replaces them with a single instance of the cell. with identical inputs and replaces them with a single instance of the cell.
The option {\tt -nomux} can be used to disable resource sharing for multiplexer The option {\tt -nomux} can be used to disable resource sharing for multiplexer
cells ({\tt \$mux}, {\tt \$pmux}, and {\tt \$safe\_pmux}). This can be useful as cells ({\tt \$mux} and {\tt \$pmux}. This can be useful as
it prevents multiplexer trees to be merged, which might prevent {\tt opt\_muxtree} it prevents multiplexer trees to be merged, which might prevent {\tt opt\_muxtree}
to identify possible optimizations. to identify possible optimizations.