aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/lib/longlong.h
blob: 179eea4edc35cc3a1180214cad63ca7e2ef807de (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/* longlong.h -- based on code from gcc-2.95.3

   definitions for mixed size 32/64 bit arithmetic.
   Copyright (C) 1991, 92, 94, 95, 96, 1997, 1998 Free Software Foundation, Inc.

   This definition file is free software; you can redistribute it
   and/or modify it under the terms of the GNU General Public
   License as published by the Free Software Foundation; either
   version 2, or (at your option) any later version.

   This definition file is distributed in the hope that it will be
   useful, but WITHOUT ANY WARRANTY; without even the implied
   warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* Borrowed from GCC 2.95.3, I Molton 29/07/01 */

#ifndef SI_TYPE_SIZE
#define SI_TYPE_SIZE 32
#endif

#define __BITS4 (SI_TYPE_SIZE / 4)
#define __ll_B (1L << (SI_TYPE_SIZE / 2))
#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
#define __ll_highpart(t) ((USItype) (t) / __ll_B)

/* Define auxiliary asm macros.

   1) umul_ppmm(high_prod, low_prod, multipler, multiplicand)
   multiplies two USItype integers MULTIPLER and MULTIPLICAND,
   and generates a two-part USItype product in HIGH_PROD and
   LOW_PROD.

   2) __umulsidi3(a,b) multiplies two USItype integers A and B,
   and returns a UDItype product.  This is just a variant of umul_ppmm.

   3) udiv_qrnnd(quotient, remainder, high_numerator, low_numerator,
   denominator) divides a two-word unsigned integer, composed by the
   integers HIGH_NUMERATOR and LOW_NUMERATOR, by DENOMINATOR and
   places the quotient in QUOTIENT and the remainder in REMAINDER.
   HIGH_NUMERATOR must be less than DENOMINATOR for correct operation.
   If, in addition, the most significant bit of DENOMINATOR must be 1,
   then the pre-processor symbol UDIV_NEEDS_NORMALIZATION is defined to 1.

   4) sdiv_qrnnd(quotient, remainder, high_numerator, low_numerator,
   denominator).  Like udiv_qrnnd but the numbers are signed.  The
   quotient is rounded towards 0.

   5) count_leading_zeros(count, x) counts the number of zero-bits from
   the msb to the first non-zero bit.  This is the number of steps X
   needs to be shifted left to set the msb.  Undefined for X == 0.

   6) add_ssaaaa(high_sum, low_sum, high_addend_1, low_addend_1,
   high_addend_2, low_addend_2) adds two two-word unsigned integers,
   composed by HIGH_ADDEND_1 and LOW_ADDEND_1, and HIGH_ADDEND_2 and
   LOW_ADDEND_2 respectively.  The result is placed in HIGH_SUM and
   LOW_SUM.  Overflow (i.e. carry out) is not stored anywhere, and is
   lost.

   7) sub_ddmmss(high_difference, low_difference, high_minuend,
   low_minuend, high_subtrahend, low_subtrahend) subtracts two
   two-word unsigned integers, composed by HIGH_MINUEND_1 and
   LOW_MINUEND_1, and HIGH_SUBTRAHEND_2 and LOW_SUBTRAHEND_2
   respectively.  The result is placed in HIGH_DIFFERENCE and
   LOW_DIFFERENCE.  Overflow (i.e. carry out) is not stored anywhere,
   and is lost.

   If any of these macros are left undefined for a particular CPU,
   C macros are used.  */

#if defined (__arm__)
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  __asm__ ("adds	%1, %4, %5					\n\
	adc	%0, %2, %3"						\
	   : "=r" ((USItype) (sh)),					\
	     "=&r" ((USItype) (sl))					\
	   : "%r" ((USItype) (ah)),					\
	     "rI" ((USItype) (bh)),					\
	     "%r" ((USItype) (al)),					\
	     "rI" ((USItype) (bl)))
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  __asm__ ("subs	%1, %4, %5					\n\
	sbc	%0, %2, %3"						\
	   : "=r" ((USItype) (sh)),					\
	     "=&r" ((USItype) (sl))					\
	   : "r" ((USItype) (ah)),					\
	     "rI" ((USItype) (bh)),					\
	     "r" ((USItype) (al)),					\
	     "rI" ((USItype) (bl)))
#define umul_ppmm(xh, xl, a, b) \
{register USItype __t0, __t1, __t2;					\
  __asm__ ("%@ Inlined umul_ppmm					\n\
	mov	%2, %5, lsr #16						\n\
	mov	%0, %6, lsr #16						\n\
	bic	%3, %5, %2, lsl #16					\n\
	bic	%4, %6, %0, lsl #16					\n\
	mul	%1, %3, %4						\n\
	mul	%4, %2, %4						\n\
	mul	%3, %0, %3						\n\
	mul	%0, %2, %0						\n\
	adds	%3, %4, %3						\n\
	addcs	%0, %0, #65536						\n\
	adds	%1, %1, %3, lsl #16					\n\
	adc	%0, %0, %3, lsr #16"					\
	   : "=&r" ((USItype) (xh)),					\
	     "=r" ((USItype) (xl)),					\
	     "=&r" (__t0), "=&r" (__t1), "=r" (__t2)			\
	   : "r" ((USItype) (a)),					\
	     "r" ((USItype) (b)));}
#define UMUL_TIME 20
#define UDIV_TIME 100
#endif /* __arm__ */

#define __umulsidi3(u, v) \
  ({DIunion __w;							\
    umul_ppmm (__w.s.high, __w.s.low, u, v);				\
    __w.ll; })

#define __udiv_qrnnd_c(q, r, n1, n0, d) \
  do {									\
    USItype __d1, __d0, __q1, __q0;					\
    USItype __r1, __r0, __m;						\
    __d1 = __ll_highpart (d);						\
    __d0 = __ll_lowpart (d);						\
									\
    __r1 = (n1) % __d1;							\
    __q1 = (n1) / __d1;							\
    __m = (USItype) __q1 * __d0;					\
    __r1 = __r1 * __ll_B | __ll_highpart (n0);				\
    if (__r1 < __m)							\
      {									\
	__q1--, __r1 += (d);						\
	if (__r1 >= (d)) /* i.e. we didn't get carry when adding to __r1 */\
	  if (__r1 < __m)						\
	    __q1--, __r1 += (d);					\
      }									\
    __r1 -= __m;							\
									\
    __r0 = __r1 % __d1;							\
    __q0 = __r1 / __d1;							\
    __m = (USItype) __q0 * __d0;					\
    __r0 = __r0 * __ll_B | __ll_lowpart (n0);				\
    if (__r0 < __m)							\
      {									\
	__q0--, __r0 += (d);						\
	if (__r0 >= (d))						\
	  if (__r0 < __m)						\
	    __q0--, __r0 += (d);					\
      }									\
    __r0 -= __m;							\
									\
    (q) = (USItype) __q1 * __ll_B | __q0;				\
    (r) = __r0;								\
  } while (0)

#define UDIV_NEEDS_NORMALIZATION 1
#define udiv_qrnnd __udiv_qrnnd_c

#define count_leading_zeros(count, x) \
  do {									\
    USItype __xr = (x);							\
    USItype __a;							\
									\
    if (SI_TYPE_SIZE <= 32)						\
      {									\
	__a = __xr < ((USItype)1<<2*__BITS4)				\
	  ? (__xr < ((USItype)1<<__BITS4) ? 0 : __BITS4)		\
	  : (__xr < ((USItype)1<<3*__BITS4) ?  2*__BITS4 : 3*__BITS4);	\
      }									\
    else								\
      {									\
	for (__a = SI_TYPE_SIZE - 8; __a > 0; __a -= 8)			\
	  if (((__xr >> __a) & 0xff) != 0)				\
	    break;							\
      }									\
									\
    (count) = SI_TYPE_SIZE - (__clz_tab[__xr >> __a] + __a);		\
  } while (0)