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diff --git a/src/b-st-ext.adoc b/src/b-st-ext.adoc new file mode 100644 index 0000000..d160e05 --- /dev/null +++ b/src/b-st-ext.adoc @@ -0,0 +1,17 @@ +[[bits]] +== `B` Standard Extension for Bit Manipulation, Version 0.0 + +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. + +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 ISAs 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. + |