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[AArch64][SVE 20/32] Add support for tied operands

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SVE has some instructions in which the same register appears twice
in the assembly string, once as an input and once as an output.
This patch adds a general mechanism for that.

The patch needs to add new information to the instruction entries.
One option would have been to extend the flags field of the opcode
to 64 bits (since we already rely on 64-bit integers being available
on the host).  However, the *_INSN macros mean that it's easy to add
new information as top-level fields without affecting the existing
table entries too much.  Going for that option seemed to give slightly
neater code.

include/
	* opcode/aarch64.h (aarch64_opcode): Add a tied_operand field.
	(AARCH64_OPDE_UNTIED_OPERAND): New aarch64_operand_error_kind.

opcodes/
	* aarch64-tbl.h (CORE_INSN, __FP_INSN, SIMD_INSN, CRYP_INSN)
	(_CRC_INSN, _LSE_INSN, _LOR_INSN, RDMA_INSN, FP16_INSN, SF16_INSN)
	(V8_2_INSN, aarch64_opcode_table): Initialize tied_operand field.
	* aarch64-opc.c (aarch64_match_operands_constraint): Check for
	tied operands.

gas/
	* config/tc-aarch64.c (output_operand_error_record): Handle
	AARCH64_OPDE_UNTIED_OPERAND.
This commit is contained in:
Richard Sandiford 2016-09-21 16:52:30 +01:00
parent 01dbfe4c0e
commit 0c608d6b62
7 changed files with 65 additions and 16 deletions
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9
include/opcode/aarch64.h
View file

@ -539,6 +539,10 @@ struct aarch64_opcode
/* Flags providing information about this instruction */
uint32_t flags;
/* If nonzero, this operand and operand 0 are both registers and
are required to have the same register number. */
unsigned char tied_operand;
/* If non-NULL, a function to verify that a given instruction is valid. */
bfd_boolean (* verifier) (const struct aarch64_opcode *, const aarch64_insn);
};
@ -872,6 +876,10 @@ typedef struct aarch64_inst aarch64_inst;
No syntax error, but the operands are not a valid combination, e.g.
FMOV D0,S0
AARCH64_OPDE_UNTIED_OPERAND
The asm failed to use the same register for a destination operand
and a tied source operand.
AARCH64_OPDE_OUT_OF_RANGE
Error about some immediate value out of a valid range.
@ -908,6 +916,7 @@ enum aarch64_operand_error_kind
AARCH64_OPDE_SYNTAX_ERROR,
AARCH64_OPDE_FATAL_SYNTAX_ERROR,
AARCH64_OPDE_INVALID_VARIANT,
AARCH64_OPDE_UNTIED_OPERAND,
AARCH64_OPDE_OUT_OF_RANGE,
AARCH64_OPDE_UNALIGNED,
AARCH64_OPDE_REG_LIST,