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ec4322e70b
Add ashrdi3.c to private libgcc. Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
49 lines
990 B
C
49 lines
990 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ashrdi3.c extracted from gcc-2.7.2/libgcc2.c which is:
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* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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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 {
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SItype high, low;
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};
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typedef union {
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struct DIstruct s;
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DItype ll;
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} di_union;
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DItype __ashrdi3(DItype u, word_type b)
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{
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di_union w;
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word_type bm;
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di_union 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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/* w.s.high = 1..1 or 0..0 */
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w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
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w.s.low = uu.s.high >> -bm;
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} else {
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USItype carries = (USItype)uu.s.high << bm;
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w.s.high = 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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}
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