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Extension: Zacas #138

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Extension: Zacas #138

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@a4lg a4lg commented Oct 17, 2023

@a4lg a4lg added the enhancement New feature or request label Oct 17, 2023
@a4lg a4lg force-pushed the riscv-zacas branch 5 times, most recently from 4682912 to d26cfc8 Compare October 21, 2023 03:44
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RISC-V: Add support for 'Zacas' atomic CAS
6ea125b 
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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