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

// Differential kernel for the arm64 FP immediate moves: the FMOV (immediate)
// instruction for the 8-bit encodable values and the FMOV-from-ZR move for
// zero.  The values outside the 8-bit field pool through the toolchain's
// $f64 symbols with a PC-relative relocation; gasm carries no such pool and
// rejects the spelling instead (its previous encoding was wrong code).
// Every function is byte-compared against go tool asm.

#include "textflag.h"

// func encodable()
TEXT ·encodable(SB), NOSPLIT, $0-0
	FMOVS $ (4.0), F0
	FMOVD $ (4.0), F0
	FMOVS $ (0.265625), F1
	FMOVD $ (0.1796875), F2
	FMOVS $ (0.96875), F3
	FMOVD $ (28.0), F4
	FMOVD $ (-4.0), F6
	FMOVD $ (1.0), F7
	FMOVD $ (0.5), F8
	RET

// func zeroes()
TEXT ·zeroes(SB), NOSPLIT, $0-0
	FMOVD $0, F0
	FMOVS $0, F1
	FMOVD $ (0.0), F5
	FMOVS $ (0.0), F6
	FMOVD ZR, F2
	FMOVS ZR, F3
	RET