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@@ -0,0 +1,19 @@ +\chapter{``B'' Standard Extension for Bit Manipulation, Version 0.0} +\label{sec:bits} + +This chapter is a placeholder for a future standard extension to +provide bit manipulation instructions, including instructions to +insert, extract, and test bit fields, and for rotations, funnel +shifts, and bit and byte permutations. + +\begin{commentary} +Although bit manipulation instructions are very effective in some +application domains, particularly when dealing with externally packed +data structures, we excluded them from the base ISA as they are not +useful in all domains and can add additional complexity or instruction +formats to supply all needed operands. + +We anticipate the B extension will be a brownfield encoding within the +base 30-bit instruction space. +\end{commentary} + |