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

// Differential kernel for the arm64 whole-vector moves between a general
// register and an arranged vector (VMOV/VDUP Rs, Vd.<T>), the two-operand
// accumulate spellings VADD/VSUB Vm, Vn, and the toolchain-reserved
// R18_PLATFORM register name.  Every function is byte-compared against
// go tool asm.

#include "textflag.h"

// func gpIntoVector()
TEXT ·gpIntoVector(SB), NOSPLIT, $0-0
	VMOV R1, V2.B8
	VMOV R3, V4.B16
	VMOV R5, V6.H4
	VMOV R7, V8.H8
	VMOV R9, V10.S2
	VMOV R11, V12.S4
	VMOV R13, V14.D2
	VDUP R15, V16.B8
	VDUP R17, V18.B16
	VDUP R19, V20.H8
	VDUP R21, V22.S4
	VDUP R23, V24.D2
	RET

// func simdAccumulate()
TEXT ·simdAccumulate(SB), NOSPLIT, $0-0
	VADD V7, V8
	VSUB V7, V8
	VADD V1, V2
	VSUB V30, V31
	VADD V0.B16, V1.B16, V2.B16
	VSUB V0.S4, V1.S4, V2.S4
	RET

// func truncMove()
TEXT ·truncMove(SB), NOSPLIT, $0-0
	MOVB  R3, R4
	MOVH  R5, R6
	MOVW  R9, R10
	MOVBU R3, R4
	MOVHU R3, R4
	MOVWU R3, R4
	MOVD  R3, R4
	RET

// func platformRegister()
TEXT ·platformRegister(SB), NOSPLIT, $0-0
	MOVD R18_PLATFORM, R3
	MOVW R18_PLATFORM, R4
	MOVD R3, R18_PLATFORM
	MOVD 0x68(R18_PLATFORM), R5
	MOVD R5, 0x68(R18_PLATFORM)
	MOVW 8(R18_PLATFORM), R6
	RET