50 lines
938 B
C
50 lines
938 B
C
/*
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* lshrdi3.c extracted from gcc-2.7.2.3/libgcc2.c and
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* gcc-2.7.2.3/longlong.h
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*
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* Copyright (C) 1989-2015 Free Software Foundation, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#define BITS_PER_UNIT 8
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typedef int SItype __attribute__ ((mode (SI)));
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typedef unsigned int USItype __attribute__ ((mode (SI)));
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typedef int DItype __attribute__ ((mode (DI)));
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typedef int word_type __attribute__ ((mode (__word__)));
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struct DIstruct {SItype high, low;};
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typedef union
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{
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struct DIstruct s;
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DItype ll;
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} DIunion;
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DItype __lshrdi3 (DItype u, word_type b)
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{
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DIunion w;
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word_type bm;
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DIunion uu;
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if (b == 0)
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return u;
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uu.ll = u;
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bm = (sizeof (SItype) * BITS_PER_UNIT) - b;
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if (bm <= 0)
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{
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w.s.high = 0;
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w.s.low = (USItype)uu.s.high >> -bm;
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}
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else
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{
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USItype carries = (USItype)uu.s.high << bm;
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w.s.high = (USItype)uu.s.high >> b;
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w.s.low = ((USItype)uu.s.low >> b) | carries;
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}
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return w.ll;
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} |