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Add SiFive cease extension, https://sifive.cdn.prismic.io/sifive/767804da-53b2-4893-97d5-b7c030ae0a94_s76mc_core_complex_manual_21G3.pdf This aligns LLVM: * https://llvm.org/docs/RISCVUsage.html * https://github.com/llvm/llvm-project/pull/83896 bfd/ChangeLog: * elfxx-riscv.c (riscv_supported_vendor_x_ext): Add support for 'xsfcease'. (riscv_multi_subset_supports): Handle INSN_CLASS_XSFCEASE. (riscv_multi_subset_supports_ext): Handle INSN_CLASS_XSFCEASE. gas/ChangeLog: * doc/c-riscv.texi: Updated. * testsuite/gas/riscv/march-help.l: Updated. * testsuite/gas/riscv/sifive-insns.d: Add test case for 'sf.cease'. * testsuite/gas/riscv/sifive-insns.s: Likewise. include/ChangeLog: * opcode/riscv-opc.h (MATCH_SF_CEASE, MASK_SF_CEASE): Define match and mask encoding for 'sf.cease'. * opcode/riscv.h (INSN_CLASS_XSFCEASE): Add new instruction class for 'xsfcease'. opcodes/ChangeLog: * riscv-opc.c (riscv_opcodes): Add opcode entry for 'sf.cease'.