1//===------------- divmodqi4.S - sint8 div & mod --------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// As described at
10// https://gcc.gnu.org/wiki/avr-gcc#Exceptions_to_the_Calling_Convention, the
11// prototype is `struct {sint8, sint8}  __divmodqi4(sint8, sint8)`.
12// The sint8 quotient is returned via R24, and the sint8 remainder is returned
13// via R25, while registers R23/Rtmp and bit T in SREG are clobbered.
14//
15//===----------------------------------------------------------------------===//
16
17	.text
18	.align 2
19
20#ifdef __AVR_TINY__
21	.set __tmp_reg__, 16
22#else
23	.set __tmp_reg__, 0
24#endif
25
26	.globl __divmodqi4
27	.type  __divmodqi4, @function
28
29__divmodqi4:
30	bst     r24, 7
31	mov     __tmp_reg__, r24
32	eor     __tmp_reg__, r22
33	sbrc    r24, 7
34	neg     r24
35	sbrc    r22, 7
36	neg     r22
37	rcall   __udivmodqi4   ; Call __udivmodqi4 to do real calculation.
38	brtc    __divmodqi4_1
39	neg     r25
40
41__divmodqi4_1:
42	sbrc    __tmp_reg__, 7
43	neg     r24
44	ret                    ; Return quotient via R24 and remainder via R25.
45