mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
579 lines
9.5 KiB
C
579 lines
9.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* This file is part of GNU CC.
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*/
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typedef unsigned int UWtype;
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typedef unsigned int UHWtype;
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typedef unsigned long long UDWtype;
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#define W_TYPE_SIZE 32
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typedef unsigned char UQItype;
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typedef long SItype;
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typedef unsigned long USItype;
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typedef long long DItype;
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typedef unsigned long long DSItype;
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#include "longlong.h"
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typedef int word_type;
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typedef long Wtype;
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typedef long long DWtype;
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struct DWstruct { Wtype low, high;};
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typedef union
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{
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struct DWstruct s;
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DWtype ll;
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} DWunion;
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#define BITS_PER_UNIT 8
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UDWtype
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__udivmoddi4 (UDWtype n, UDWtype d, UDWtype *rp);
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const UQItype __clz_tab[256] =
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{
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0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
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6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
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8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
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};
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DWtype
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__ashldi3 (DWtype u, word_type b)
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{
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if (b == 0)
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return u;
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const DWunion uu = {.ll = u};
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const word_type bm = (sizeof (Wtype) * BITS_PER_UNIT) - b;
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DWunion w;
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if (bm <= 0)
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{
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w.s.low = 0;
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w.s.high = (UWtype) uu.s.low << -bm;
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}
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else
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{
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const UWtype carries = (UWtype) uu.s.low >> bm;
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w.s.low = (UWtype) uu.s.low << b;
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w.s.high = ((UWtype) uu.s.high << b) | carries;
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}
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return w.ll;
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}
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DWtype
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__ashrdi3 (DWtype u, word_type b)
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{
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if (b == 0)
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return u;
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const DWunion uu = {.ll = u};
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const word_type bm = (sizeof (Wtype) * BITS_PER_UNIT) - b;
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DWunion w;
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if (bm <= 0)
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{
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/* w.s.high = 1..1 or 0..0 */
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w.s.high = uu.s.high >> (sizeof (Wtype) * BITS_PER_UNIT - 1);
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w.s.low = uu.s.high >> -bm;
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}
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else
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{
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const UWtype carries = (UWtype) uu.s.high << bm;
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w.s.high = uu.s.high >> b;
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w.s.low = ((UWtype) uu.s.low >> b) | carries;
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}
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return w.ll;
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}
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DWtype
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__lshrdi3 (DWtype u, word_type b)
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{
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if (b == 0)
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return u;
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const DWunion uu = {.ll = u};
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const word_type bm = (sizeof (Wtype) * BITS_PER_UNIT) - b;
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DWunion w;
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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 = (UWtype) uu.s.high >> -bm;
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}
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else
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{
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const UWtype carries = (UWtype) uu.s.high << bm;
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w.s.high = (UWtype) uu.s.high >> b;
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w.s.low = ((UWtype) uu.s.low >> b) | carries;
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}
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return w.ll;
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}
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word_type
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__cmpdi2 (DWtype a, DWtype b)
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{
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const DWunion au = {.ll = a};
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const DWunion bu = {.ll = b};
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if (au.s.high < bu.s.high)
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return 0;
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else if (au.s.high > bu.s.high)
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return 2;
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if ((UWtype) au.s.low < (UWtype) bu.s.low)
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return 0;
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else if ((UWtype) au.s.low > (UWtype) bu.s.low)
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return 2;
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return 1;
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}
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UDWtype
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__udivmoddi4 (UDWtype n, UDWtype d, UDWtype *rp)
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{
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const DWunion nn = {.ll = n};
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const DWunion dd = {.ll = d};
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DWunion rr;
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UWtype d0, d1, n0, n1, n2;
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UWtype q0, q1;
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UWtype b, bm;
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d0 = dd.s.low;
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d1 = dd.s.high;
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n0 = nn.s.low;
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n1 = nn.s.high;
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#if !UDIV_NEEDS_NORMALIZATION
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if (d1 == 0)
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{
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if (d0 > n1)
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{
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/* 0q = nn / 0D */
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udiv_qrnnd (q0, n0, n1, n0, d0);
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q1 = 0;
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/* Remainder in n0. */
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}
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else
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{
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/* qq = NN / 0d */
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if (d0 == 0)
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d0 = 1 / d0; /* Divide intentionally by zero. */
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udiv_qrnnd (q1, n1, 0, n1, d0);
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udiv_qrnnd (q0, n0, n1, n0, d0);
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/* Remainder in n0. */
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}
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if (rp != 0)
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{
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rr.s.low = n0;
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rr.s.high = 0;
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*rp = rr.ll;
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}
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}
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#else /* UDIV_NEEDS_NORMALIZATION */
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if (d1 == 0)
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{
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if (d0 > n1)
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{
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/* 0q = nn / 0D */
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count_leading_zeros (bm, d0);
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if (bm != 0)
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{
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/* Normalize, i.e. make the most significant bit of the
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denominator set. */
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d0 = d0 << bm;
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n1 = (n1 << bm) | (n0 >> (W_TYPE_SIZE - bm));
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n0 = n0 << bm;
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}
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udiv_qrnnd (q0, n0, n1, n0, d0);
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q1 = 0;
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/* Remainder in n0 >> bm. */
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}
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else
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{
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/* qq = NN / 0d */
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if (d0 == 0)
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d0 = 1 / d0; /* Divide intentionally by zero. */
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count_leading_zeros (bm, d0);
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if (bm == 0)
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{
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/* From (n1 >= d0) /\ (the most significant bit of d0 is set),
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conclude (the most significant bit of n1 is set) /\ (the
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leading quotient digit q1 = 1).
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This special case is necessary, not an optimization.
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(Shifts counts of W_TYPE_SIZE are undefined.) */
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n1 -= d0;
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q1 = 1;
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}
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else
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{
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/* Normalize. */
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b = W_TYPE_SIZE - bm;
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d0 = d0 << bm;
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n2 = n1 >> b;
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n1 = (n1 << bm) | (n0 >> b);
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n0 = n0 << bm;
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udiv_qrnnd (q1, n1, n2, n1, d0);
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}
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/* n1 != d0... */
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udiv_qrnnd (q0, n0, n1, n0, d0);
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/* Remainder in n0 >> bm. */
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}
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if (rp != 0)
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{
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rr.s.low = n0 >> bm;
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rr.s.high = 0;
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*rp = rr.ll;
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}
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}
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#endif /* UDIV_NEEDS_NORMALIZATION */
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else
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{
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if (d1 > n1)
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{
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/* 00 = nn / DD */
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q0 = 0;
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q1 = 0;
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/* Remainder in n1n0. */
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if (rp != 0)
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{
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rr.s.low = n0;
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rr.s.high = n1;
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*rp = rr.ll;
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}
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}
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else
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{
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/* 0q = NN / dd */
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count_leading_zeros (bm, d1);
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if (bm == 0)
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{
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/* From (n1 >= d1) /\ (the most significant bit of d1 is set),
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conclude (the most significant bit of n1 is set) /\ (the
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quotient digit q0 = 0 or 1).
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This special case is necessary, not an optimization. */
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/* The condition on the next line takes advantage of that
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n1 >= d1 (true due to program flow). */
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if (n1 > d1 || n0 >= d0)
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{
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q0 = 1;
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sub_ddmmss (n1, n0, n1, n0, d1, d0);
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}
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else
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q0 = 0;
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q1 = 0;
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if (rp != 0)
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{
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rr.s.low = n0;
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rr.s.high = n1;
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*rp = rr.ll;
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}
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}
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else
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{
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UWtype m1, m0;
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/* Normalize. */
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b = W_TYPE_SIZE - bm;
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d1 = (d1 << bm) | (d0 >> b);
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d0 = d0 << bm;
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n2 = n1 >> b;
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n1 = (n1 << bm) | (n0 >> b);
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n0 = n0 << bm;
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udiv_qrnnd (q0, n1, n2, n1, d1);
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umul_ppmm (m1, m0, q0, d0);
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if (m1 > n1 || (m1 == n1 && m0 > n0))
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{
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q0--;
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sub_ddmmss (m1, m0, m1, m0, d1, d0);
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}
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q1 = 0;
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/* Remainder in (n1n0 - m1m0) >> bm. */
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if (rp != 0)
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{
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sub_ddmmss (n1, n0, n1, n0, m1, m0);
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rr.s.low = (n1 << b) | (n0 >> bm);
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rr.s.high = n1 >> bm;
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*rp = rr.ll;
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}
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}
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}
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}
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const DWunion ww = {{.low = q0, .high = q1}};
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return ww.ll;
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}
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DWtype
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__divdi3 (DWtype u, DWtype v)
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{
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word_type c = 0;
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DWunion uu = {.ll = u};
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DWunion vv = {.ll = v};
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DWtype w;
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if (uu.s.high < 0)
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c = ~c,
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uu.ll = -uu.ll;
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if (vv.s.high < 0)
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c = ~c,
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vv.ll = -vv.ll;
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w = __udivmoddi4 (uu.ll, vv.ll, (UDWtype *) 0);
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if (c)
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w = -w;
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return w;
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}
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DWtype
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__negdi2 (DWtype u)
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{
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const DWunion uu = {.ll = u};
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const DWunion w = { {.low = -uu.s.low,
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.high = -uu.s.high - ((UWtype) -uu.s.low > 0) } };
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return w.ll;
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}
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DWtype
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__muldi3 (DWtype u, DWtype v)
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{
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const DWunion uu = {.ll = u};
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const DWunion vv = {.ll = v};
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DWunion w = {.ll = __umulsidi3 (uu.s.low, vv.s.low)};
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w.s.high += ((UWtype) uu.s.low * (UWtype) vv.s.high
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+ (UWtype) uu.s.high * (UWtype) vv.s.low);
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return w.ll;
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}
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DWtype
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__moddi3 (DWtype u, DWtype v)
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{
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word_type c = 0;
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DWunion uu = {.ll = u};
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DWunion vv = {.ll = v};
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DWtype w;
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if (uu.s.high < 0)
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c = ~c,
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uu.ll = -uu.ll;
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if (vv.s.high < 0)
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vv.ll = -vv.ll;
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(void) __udivmoddi4 (uu.ll, vv.ll, (UDWtype*)&w);
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if (c)
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w = -w;
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return w;
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}
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word_type
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__ucmpdi2 (DWtype a, DWtype b)
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{
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const DWunion au = {.ll = a};
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const DWunion bu = {.ll = b};
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if ((UWtype) au.s.high < (UWtype) bu.s.high)
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return 0;
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else if ((UWtype) au.s.high > (UWtype) bu.s.high)
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return 2;
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if ((UWtype) au.s.low < (UWtype) bu.s.low)
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return 0;
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else if ((UWtype) au.s.low > (UWtype) bu.s.low)
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return 2;
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return 1;
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}
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UDWtype
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__udivdi3 (UDWtype n, UDWtype d)
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{
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return __udivmoddi4 (n, d, (UDWtype *) 0);
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}
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UDWtype
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__umoddi3 (UDWtype u, UDWtype v)
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{
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UDWtype w;
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(void) __udivmoddi4 (u, v, &w);
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return w;
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}
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static USItype
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udivmodsi4(USItype num, USItype den, word_type modwanted)
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{
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USItype bit = 1;
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USItype res = 0;
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while (den < num && bit && !(den & (1L<<31)))
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{
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den <<=1;
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bit <<=1;
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}
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while (bit)
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{
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if (num >= den)
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{
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num -= den;
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res |= bit;
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}
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bit >>=1;
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den >>=1;
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}
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if (modwanted) return num;
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return res;
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}
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SItype
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__divsi3 (SItype a, SItype b)
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{
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word_type neg = 0;
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SItype res;
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if (a < 0)
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{
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a = -a;
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neg = !neg;
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}
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if (b < 0)
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{
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b = -b;
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neg = !neg;
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}
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res = udivmodsi4 (a, b, 0);
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if (neg)
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res = -res;
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return res;
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}
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SItype
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__udivsi3 (SItype a, SItype b)
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{
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return udivmodsi4 (a, b, 0);
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}
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SItype
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__modsi3 (SItype a, SItype b)
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{
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word_type neg = 0;
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SItype res;
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if (a < 0)
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{
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a = -a;
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neg = 1;
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}
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if (b < 0)
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b = -b;
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res = udivmodsi4 (a, b, 1);
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if (neg)
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res = -res;
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return res;
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}
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SItype
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__mulsi3 (SItype a, SItype b)
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{
|
|
SItype res = 0;
|
|
USItype cnt = a;
|
|
|
|
while (cnt)
|
|
{
|
|
if (cnt & 1)
|
|
{
|
|
res += b;
|
|
}
|
|
b <<= 1;
|
|
cnt >>= 1;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
SItype
|
|
__umodsi3 (SItype a, SItype b)
|
|
|
|
{
|
|
return udivmodsi4 (a, b, 1);
|
|
}
|
|
|
|
int
|
|
__gcc_bcmp (const unsigned char *s1, const unsigned char *s2, unsigned long size)
|
|
{
|
|
while (size > 0)
|
|
{
|
|
const unsigned char c1 = *s1++, c2 = *s2++;
|
|
if (c1 != c2)
|
|
return c1 - c2;
|
|
size--;
|
|
}
|
|
return 0;
|
|
}
|