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

#include "textflag.h"

// func cleanAdd(a, b int64) int64
// A well-behaved function that preserves all callee-saved registers.
TEXT ·cleanAdd(SB), NOSPLIT, $0-24
	MOVD a+0(FP), R0
	MOVD b+8(FP), R1
	ADD  R0, R1, R0
	MOVD R0, ret+16(FP)
	RET

// func dirtyFP(a int64) int64
// Deliberately clobbers R29, the frame pointer (an ABI violation for a
// NOSPLIT frame=0 function).
TEXT ·dirtyFP(SB), NOSPLIT, $0-16
	MOVD $0x1234, R29
	MOVD a+0(FP), R0
	MOVD R0, ret+8(FP)
	RET

// func dirtyG(a int64) int64
// Deliberately clobbers g, the goroutine pointer (R28; a serious ABI violation).
TEXT ·dirtyG(SB), NOSPLIT, $0-16
	MOVD $0x5678, g
	MOVD a+0(FP), R0
	MOVD R0, ret+8(FP)
	RET