only. Upper 32 bits of rs2. Operation X(rd) = EXTS(hi_half @ lo_half); Included in Extension Minimum version Lifecycle state Zbb (Basic bit-manipulation) 0.93 Ratified Zbkb 1.0 Ratified Zhinxmin 1.0 Ratified M 2.0 Ratified Zifencei 2.0 Ratified Zce 1.0
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