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