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[binutils-gdb] Add remainder of Em16 restrictions for AArch64 gas.


*** TEST RESULTS FOR COMMIT 45a28947f3fe5693560e9a1d6373807a9e82c04a ***

Author: Tamar Christina <tamar.christina@arm.com>
Branch: master
Commit: 45a28947f3fe5693560e9a1d6373807a9e82c04a

Add remainder of Em16 restrictions for AArch64 gas.

This adds the missing Em16 constraints the rest of the instructions requiring them
and also adds a testcase to test all the instructions so these are checked from
now on.

The Em16 operand constrains the valid registers to the lower 16 registers when used
with a half precision qualifier.

The list has been cross checked (by hand) through the Arm ARM version Ca.

opcodes/

	PR binutils/23192
	* aarch64-tbl.h (sqdmlal, sqdmlal2, smlsl, smlsl2, sqdmlsl, sqdmlsl2,
	mul, smull, smull2, sqdmull, sqdmull2, sqdmulh, sqrdmulh, mla, umlal,
	umlal2, mls, umlsl, umlsl2, umull, umull2, sqdmlal, sqdmlsl, sqdmull,
	sqdmulh, sqrdmulh): Use Em16.

gas/

	PR binutils/23192
	* testsuite/gas/aarch64/illegal-by-element.s: New.
	* testsuite/gas/aarch64/illegal-by-element.d: New.
	* testsuite/gas/aarch64/illegal-by-element.l: New.


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