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This commit adds support for the 'Zacas' extension, adding atomic CAS instructions. Beware that this extension also introduces the concept of register pairs and it checks the validity of rs1 and rs2 if applicable. This is based on the latest (frozen) draft: <https://github.com/riscv/riscv-zacas/releases/tag/v1.0-rc5> bfd/ChangeLog: * elfxx-riscv.c (riscv_implicit_subsets): Make 'Zacas' to imply 'A' extension. (riscv_supported_std_z_ext): Add 'Zacas' to the supported list. (riscv_multi_subset_supports, riscv_multi_subset_supports_ext): Add handling for new instruction class. gas/ChangeLog: * testsuite/gas/riscv/zacas-32.s: New test. * testsuite/gas/riscv/zacas-32.d: Likewise. * testsuite/gas/riscv/zacas-64.s: Likewise. * testsuite/gas/riscv/zacas-64.d: Likewise. * testsuite/gas/riscv/zacas-32-fail.s: New failure test. * testsuite/gas/riscv/zacas-32-fail.d: Likewise. * testsuite/gas/riscv/zacas-32-fail.l: Likewise. * testsuite/gas/riscv/zacas-64-fail.s: New failure test. * testsuite/gas/riscv/zacas-64-fail.d: Likewise. * testsuite/gas/riscv/zacas-64-fail.l: Likewise. include/ChangeLog: * opcode/riscv-opc.h (MATCH_AMOCAS_D, MASK_AMOCAS_D, MATCH_AMOCAS_Q, MASK_AMOCAS_Q, MATCH_AMOCAS_W, MASK_AMOCAS_W): New. * opcode/riscv.h (enum riscv_insn_class): Add new instruction class INSN_CLASS_ZACAS. opcodes/ChangeLog: * riscv-opc.c (REGGROUP_REGS_x, REGGROUP_REGS_1, REGGROUP_REGS_2, DEFINE_MATCH_FUNC_R): New match function template with register groups. (match_reggroup_r_1_1_1, match_reggroup_r_1_2_2): New. (riscv_opcodes): Add atomic CAS instructions.
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Wiki Page (details): https://github.com/a4lg/binutils-gdb/wiki/riscv_zacas