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//===------------- divmodqi4.S - sint8 div & mod --------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// As described at
// https://gcc.gnu.org/wiki/avr-gcc#Exceptions_to_the_Calling_Convention, the
// prototype is `struct {sint8, sint8} __divmodqi4(sint8, sint8)`.
// The sint8 quotient is returned via R24, and the sint8 remainder is returned
// via R25, while registers R23/Rtmp and bit T in SREG are clobbered.
//
//===----------------------------------------------------------------------===//
.text
.align 2
#ifdef __AVR_TINY__
.set __tmp_reg__, 16
#else
.set __tmp_reg__, 0
#endif
.globl __divmodqi4
.type __divmodqi4, @function
__divmodqi4:
bst r24, 7
mov __tmp_reg__, r24
eor __tmp_reg__, r22
sbrc r24, 7
neg r24
sbrc r22, 7
neg r22
rcall __udivmodqi4 ; Call __udivmodqi4 to do real calculation.
brtc __divmodqi4_1
neg r25
__divmodqi4_1:
sbrc __tmp_reg__, 7
neg r24
ret ; Return quotient via R24 and remainder via R25.
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