⚠️ split B ISA extension into individual sub-extensions #1044
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stnolting
added
HW
relocate tuning options flags
add Zba, Zbb, Zbs
# for free
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The RISC-V "bit manipulation" (
B) ISA extensions consists of three individual sub-extensions. This PR splits the core'sBextension so users can specify which sub-extension they really need (improving hardware efficiency).Zba: shifted-add bit manipulation instructions; enabled viaRISCV_ISA_ZbaZbb: basic bit manipulation instructions; enabled viaRISCV_ISA_ZbbZbs: single-bit bit manipulation instructions; enabled viaRISCV_ISA_ZbsHence,
B=Zba+Zbb+Zbs.