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

// Differential kernel for the arm64 register-offset addressing forms:
// (Rn)(Rm), (Rn)(Rm<<k), (Rn)(Rm*1) and the extend spellings
// (Rn)(Rm.UXTW<<k), (Rn)(Rm.SXTW), (Rn)(Rm.SXTX<<k).  Every function is
// byte-compared against go tool asm.

#include "textflag.h"

// func loads()
TEXT ·loads(SB), NOSPLIT, $0-0
	MOVD  (R2)(R6.SXTW), R4
	MOVD  (R3)(R6), R5
	MOVD  (R3)(R6*1), R5
	MOVD  (R2)(R6), R4
	MOVWU (R19)(R20<<2), R20
	MOVD  (R2)(R3<<0), R1
	MOVD  (R2)(R6<<3), R4
	MOVD  (R3)(R7.SXTX<<3), R8
	MOVWU (R5)(R4.UXTW), R10
	MOVBU (R3)(R9.UXTW), R8
	MOVBU (R5)(R8), R10
	MOVHU (R2)(R7.SXTW<<1), R11
	MOVHU (R1)(R2<<1), R5
	MOVBU (R9)(R3.UXTW), R6
	MOVBU (R10)(R6), R15
	MOVBU (R29)(R30<<0), R14
	MOVH  (R5)(R7.SXTX<<1), R19
	MOVH  (R8)(R4<<1), R10
	MOVW  (R9)(R8.SXTW<<2), R19
	MOVW  (R1)(R4.SXTX), R11
	MOVW  (R1)(R4.SXTX), ZR
	MOVW  (R2)(R5), R12
	FMOVS (R2)(R6), F4
	FMOVS (R2)(R6<<2), F4
	FMOVD (R2)(R6), F4
	FMOVD (R2)(R6<<3), F4
	RET

// func stores()
TEXT ·stores(SB), NOSPLIT, $0-0
	MOVD  R5, (R2)(R6<<3)
	MOVD  R9, (R6)(R7.SXTX<<3)
	MOVD  ZR, (R6)(R7.SXTX<<3)
	MOVW  R8, (R2)(R3.UXTW<<2)
	MOVW  R7, (R3)(R4.SXTW)
	MOVB  R4, (R2)(R6.SXTX)
	MOVB  R8, (R3)(R9.UXTW)
	MOVB  R10, (R5)(R8)
	MOVB  R10, (R5)(R8*1)
	MOVH  R11, (R2)(R7.SXTW<<1)
	MOVH  R5, (R1)(R2<<1)
	MOVH  R7, (R2)(R5.SXTX<<1)
	MOVH  R8, (R3)(R6.UXTW)
	MOVB  R4, (R2)(R6.SXTX)
	FMOVS F4, (R2)(R6)
	FMOVS F4, (R2)(R6<<2)
	FMOVD F4, (R2)(R6)
	FMOVD F4, (R2)(R6<<3)
	RET

// func frames()
TEXT ·frames(SB), NOSPLIT, $0-0
	MOVD  (RSP)(R3), R1
	MOVD  (R2)(RSP), R1
	MOVD  (R2)(R2), R2
	MOVW  (R2)(R3.SXTW), R1
	MOVBU (R1)(R2<<0), R3
	MOVH  (R1)(R2<<1), R3
	RET