// 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
	MOVQ a+0(FP), AX
	ADDQ b+8(FP), AX
	MOVQ AX, ret+16(FP)
	RET

// func dirtyBP(a int64) int64
// Deliberately clobbers BP (an ABI violation for a NOSPLIT frame=0 function).
TEXT ·dirtyBP(SB), NOSPLIT, $0-16
	MOVQ $0x1234, BP
	MOVQ a+0(FP), AX
	MOVQ AX, ret+8(FP)
	RET

// func dirtyR14(a int64) int64
// Deliberately clobbers R14 (the goroutine pointer — a serious ABI violation).
TEXT ·dirtyR14(SB), NOSPLIT, $0-16
	MOVQ $0x5678, R14
	MOVQ a+0(FP), AX
	MOVQ AX, ret+8(FP)
	RET