49 lines
990 B
C
49 lines
990 B
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* ashrdi3.c extracted from gcc-2.7.2/libgcc2.c which is:
|
|
* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
|
|
*/
|
|
|
|
#define BITS_PER_UNIT 8
|
|
|
|
typedef int SItype __attribute__((mode(SI)));
|
|
typedef unsigned int USItype __attribute__((mode(SI)));
|
|
typedef int DItype __attribute__((mode(DI)));
|
|
typedef int word_type __attribute__((mode(__word__)));
|
|
|
|
struct DIstruct {
|
|
SItype high, low;
|
|
};
|
|
|
|
typedef union {
|
|
struct DIstruct s;
|
|
DItype ll;
|
|
} di_union;
|
|
|
|
DItype __ashrdi3(DItype u, word_type b)
|
|
{
|
|
di_union w;
|
|
word_type bm;
|
|
di_union uu;
|
|
|
|
if (b == 0)
|
|
return u;
|
|
|
|
uu.ll = u;
|
|
|
|
bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
|
|
if (bm <= 0) {
|
|
/* w.s.high = 1..1 or 0..0 */
|
|
w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
|
|
w.s.low = uu.s.high >> -bm;
|
|
} else {
|
|
USItype carries = (USItype)uu.s.high << bm;
|
|
|
|
w.s.high = uu.s.high >> b;
|
|
w.s.low = ((USItype)uu.s.low >> b) | carries;
|
|
}
|
|
|
|
return w.ll;
|
|
}
|
|
|