| 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 | |
|---|
