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[DEPENDENCY] This patch requires my 'Zacas' support patch v2 as in: <https://sourceware.org/pipermail/binutils/2023-October/130098.html> [DO NOT MERGE] Despite that this extension is nearing to be Frozen, the development of this extension is not yet completed. Until this extension is frozen/ratified and final version number is determined, this patch should not be merged upstream. This commit uses unratified version 0.9 as in the latest release tag: <https://github.com/riscv/riscv-zabha/releases/tag/v0.9> This commit adds support for the 'Zabha' extension, adding subword (byte and half) AMO instructions. This is based on the latest commit: <riscv/riscv-zabha@810f0ee> bfd/ChangeLog: * elfxx-riscv.c (riscv_implicit_subsets): Make 'Zabha' to imply 'A' extension. (riscv_supported_std_z_ext): Add 'Zabha' to the supported list. (riscv_multi_subset_supports, riscv_multi_subset_supports_ext): Add handling for new instruction classes. gas/ChangeLog: * testsuite/gas/riscv/zabha.s: New test. * testsuite/gas/riscv/zabha.d: Likewise. * testsuite/gas/riscv/zabha-zacas.s: New test. * testsuite/gas/riscv/zabha-zacas.d: Likewise. include/ChangeLog: * opcode/riscv-opc.h (MATCH_AMOADD_B, MASK_AMOADD_B, MATCH_AMOADD_H, MASK_AMOADD_H, MATCH_AMOAND_B, MASK_AMOAND_B, MATCH_AMOAND_H, MASK_AMOAND_H, MATCH_AMOMAX_B, MASK_AMOMAX_B, MATCH_AMOMAX_H, MASK_AMOMAX_H, MATCH_AMOMAXU_B, MASK_AMOMAXU_B, MATCH_AMOMAXU_H, MASK_AMOMAXU_H, MATCH_AMOMIN_B, MASK_AMOMIN_B, MATCH_AMOMIN_H, MASK_AMOMIN_H, MATCH_AMOMINU_B, MASK_AMOMINU_B, MATCH_AMOMINU_H, MASK_AMOMINU_H, MATCH_AMOOR_B, MASK_AMOOR_B, MATCH_AMOOR_H, MASK_AMOOR_H, MATCH_AMOSWAP_B, MASK_AMOSWAP_B, MATCH_AMOSWAP_H, MASK_AMOSWAP_H, MATCH_AMOXOR_B, MASK_AMOXOR_B, MATCH_AMOXOR_H, MASK_AMOXOR_H, MATCH_AMOCAS_B, MASK_AMOCAS_B, MATCH_AMOCAS_H, MASK_AMOCAS_H): New. * opcode/riscv.h (enum riscv_insn_class): Add new instruction classes INSN_CLASS_ZABHA and INSN_CLASS_ZABHA_AND_ZACAS. opcodes/ChangeLog: * riscv-opc.c (riscv_opcodes): Add subword AMO instructions.
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Wiki Page (details): https://github.com/a4lg/binutils-gdb/wiki/riscv_zabha