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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* Subroutines for insn-output.c for Convex.
Copyright (C) 1989, 1990 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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 1, or (at your option)
any later version.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Boolean to keep track of whether the current section is .text or not.
Used by .align handler in tm-convex.h. */
int current_section_is_text;
/*
* set_cmp (left_rtx, right_rtx, [bhwlsd])
* gen_cmp (label_rtx, cmpop, [tf])
*
* set_cmp saves the operands of a "cmp" insn,
* along with the type character to be used in the compare instruction.
*
* gen_cmp finds out what comparison is to be performed and
* outputs the necessary instructions, eg,
* "eq.w a1,a2 ! jbra.t L5"
* for (cmpsi a1 a2) (beq L5)
*/
static rtx xop0, xop1;
static char typech, regch;
char *
set_cmp (op0, op1, typechr)
rtx op0, op1;
char typechr;
{
xop0 = op0;
xop1 = op1;
typech = typechr;
if (GET_CODE (op0) == REG)
regch = REGNO_OK_FOR_BASE_P (REGNO (op0)) ? 'a' : 's';
else if (GET_CODE (op1) == REG)
regch = REGNO_OK_FOR_BASE_P (REGNO (op1)) ? 'a' : 's';
else abort ();
return "";
}
char *
gen_cmp (label, cmpop, tf)
rtx label;
char *cmpop;
char tf;
{
char buf[80];
char revop[4];
rtx ops[3];
ops[2] = label;
/* constant must be first; swap operands if necessary
if lt, le, ltu, leu are swapped, change to le, lt, leu, ltu
and reverse the sense of the jump */
if (CONSTANT_P (xop1) || GET_CODE (xop1) == CONST_DOUBLE)
{
ops[0] = xop1;
ops[1] = xop0;
if (cmpop[0] == 'l')
{
bcopy (cmpop, revop, 4);
revop[1] ^= 'e' ^ 't';
tf ^= 't' ^ 'f';
cmpop = revop;
}
}
else
{
ops[0] = xop0;
ops[1] = xop1;
}
sprintf (buf, "%s.%c %%0,%%1\n\tjbr%c.%c %%l2", cmpop, typech, regch, tf);
output_asm_insn (buf, ops);
return "";
}
/*
* Routines to look at CONST_DOUBLEs without sinful knowledge of
* what the inside of u.d looks like
*
* const_double_high_int -- high word of machine double or long long
* const_double_low_int -- low word
* const_double_float_int -- the word of a machine float
*/
static double frexp ();
static void float_extract ();
int
const_double_high_int (x)
rtx x;
{
if (GET_MODE (x) == DImode)
return CONST_DOUBLE_HIGH (x);
else
{
int sign, expd, expf;
unsigned fracdh, fracdl, fracf;
float_extract (x, &sign, &expd, &fracdh, &fracdl, &expf, &fracf);
if (fracdh == 0)
return 0;
if (expd < -01777 || expd > 01777)
return 1 << 31;
return sign << 31 | (expd + 02000) << 20 | fracdh - (1 << 20);
}
}
int
const_double_low_int (x)
rtx x;
{
if (GET_MODE (x) == DImode)
return CONST_DOUBLE_LOW (x);
else
{
int sign, expd, expf;
unsigned fracdh, fracdl, fracf;
float_extract (x, &sign, &expd, &fracdh, &fracdl, &expf, &fracf);
return fracdl;
}
}
int
const_double_float_int (x)
rtx x;
{
int sign, expd, expf;
unsigned fracdh, fracdl, fracf;
float_extract (x, &sign, &expd, &fracdh, &fracdl, &expf, &fracf);
if (fracf == 0)
return 0;
if (expf < -0177 || expf > 0177)
return 1 << 31;
return sign << 31 | (expf + 0200) << 20 | fracf - (1 << 23);
}
#define T21 ((double) (1 << 21))
#define T24 ((double) (1 << 24))
#define T53 ((double) (1 << 27) * (double) (1 << 26))
static void
float_extract (x, sign, expd, fracdh, fracdl, expf, fracf)
rtx x;
int *sign, *expd, *expf;
unsigned *fracdh, *fracdl, *fracf;
{
int exp, round;
double d, r;
union real_extract u;
bcopy (&CONST_DOUBLE_LOW (x), &u, sizeof u);
/* Get sign and exponent. */
if (*sign = u.d < 0)
u.d = -u.d;
d = frexp (u.d, &exp);
/* Get 21 fraction bits for high word and 32 for low word. */
for (round = 0; ; round = 1)
{
r = frexp (round ? d + 1.0 / T53 : d, expd);
*expd += exp;
*fracdh = r * T21;
*fracdl = (r - *fracdh / T21) * T53;
if (round || ((r - *fracdh / T21) - *fracdl / T53) < 0.5 * T53)
break;
}
/* Get 24 bits for float fraction. */
for (round = 0; ; round = 1)
{
r = frexp (round ? d + 1.0 / T24 : d, expf);
*expf += exp;
*fracf = r * T24;
if (round || (r - *fracf / T24) < 0.5 * T24)
break;
}
}
static double
frexp (d, exp)
double d;
int *exp;
{
int e = 0;
if (d > 0)
{
while (d < 0.5) d *= 2.0, e--;
while (d >= 1.0) d /= 2.0, e++;
}
*exp = e;
return d;
}
|
