// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: BSD-3-Clause

// Differential kernel for the arm64 Q-width FP move: the FMOVQ load and
// store in the plain, post-index and pre-index forms, against scaled and
// unscaled offsets, and against static symbols.  Every function is
// byte-compared against go tool asm.

#include "textflag.h"

// func writeback()
TEXT ·writeback(SB), NOSPLIT, $0-0
	FMOVQ.P F13, 11(R10)
	FMOVQ.W F15, 11(R20)
	FMOVS.P F20, 4(R0)
	FMOVS.W F20, 4(R0)
	FMOVD.P F20, 8(R1)
	FMOVD.W F20, 8(R1)
	FMOVQ.P 11(R10), F13
	FMOVQ.W 11(R20), F15
	FMOVS.P 8(R0), F20
	FMOVS.W 8(R0), F20
	FMOVD.W 8(R1), F20
	RET

// func plain()
TEXT ·plain(SB), NOSPLIT, $0-0
	FMOVQ F0, 32(R5)
	FMOVQ F10, 65520(R10)
	FMOVQ F11, 64(RSP)
	FMOVQ F11, 8(R20)
	FMOVQ F11, 4(R20)
	FMOVQ 32(R5), F2
	FMOVQ 65520(R10), F10
	FMOVQ 64(RSP), F11
	FMOVD F1, 8(R2)
	FMOVD 8(R2), F1
	RET

// func symbols()
TEXT ·symbols(SB), NOSPLIT, $0-0
	FMOVQ F5, x(SB)
	FMOVQ F5, x+8(SB)
	FMOVQ x+8(SB), F5
	FMOVQ x(SB), F5
	RET

// data the symbol forms refer to
GLOBL x(SB), NOPTR, $16