summaryrefslogtreecommitdiff
path: root/fitz/base_cpudep.c
blob: 0068d25207c1f04c455f193418396c8a1e6a2229 (plain)
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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
run-time cpu feature detection code
mm, alphabet soup...

Glenn Kennard <d98gk@efd.lth.se>
*/

#include "fitz.h"

/* global run-time constant */
unsigned fz_cpuflags = 0;

#ifndef HAVE_CPUDEP

void fz_accelerate(void)
{
}

void fz_cpudetect(void)
{
}

#else

#ifndef _WIN32
#include <signal.h> /* signal/sigaction */
#include <setjmp.h> /* sigsetjmp/siglongjmp */
#endif

/*
#ifdef _WIN32
#define sigjmp_buf jmp_buf
#define sigsetjmp(a,b) setjmp(a)
#define siglongjmp longjmp
#endif
*/

typedef struct {
	void (*test)(void);
	const unsigned flag;
	const char *name;
} featuretest;


#if defined(ARCH_X86) || defined(ARCH_X86_64)

#ifdef __GNUC__
static void mmx(void)
{ __asm__ ("pand %mm0, %mm0\n\t"); }

static void m3dnow(void)
{ __asm__ ("pavgusb %mm0, %mm0\n\t"); }

static void mmxext(void) /* aka  Extended 3DNow! */
{ __asm__ ("pmaxsw %mm0, %mm0\n\t"); }

static void sse(void)
{ __asm__ ("andps %xmm0, %xmm0\n\t"); }

static void sse2(void)
{ __asm__ ("andpd %xmm0, %xmm0\n\t"); }

/*
static void sse3(void)
{ __asm__ ("haddps %%xmm0, %%xmm0\n\t" : : : "%xmm0"); }
*/
#else
static void mmx(void)
{ __asm pand mm0, mm0; }

static void m3dnow(void)
{ __asm pavgusb mm0, mm0; }

static void mmxext(void) /* aka  Extended 3DNow! */
{ __asm pmaxsw mm0, mm0; }

static void sse(void)
{ __asm andps xmm0, xmm0; }

static void sse2(void)
{ __asm andpd xmm0, xmm0; }
#endif


#ifdef ARCH_X86_64
static void amd64(void)
#ifdef __GNUC__
{ __asm__ ("and %rax, %rax\n\t"); }
#else
{ __asm and rax, rax; }
#endif
#endif


static const featuretest features[] = {
	{ mmx, HAVE_MMX, "mmx" },
	{ m3dnow, HAVE_3DNOW, "3dnow" },
	{ mmxext, HAVE_MMXEXT, "mmxext" },
	{ sse, HAVE_SSE, "sse" },
	{ sse2, HAVE_SSE2, "sse2" },
	/*	{ sse3, HAVE_SSE3, "sse3" }, */
#ifdef ARCH_X86_64
	{ amd64, HAVE_AMD64, "amd64" }
#endif
};

#endif

static int
enabled(char *env, const char *ext)
{
	int len;
	char *s;
	if (!env)
		return 1;
	len = strlen(ext);
	s = env;
	while ((s = strstr(s, ext)))
	{
		int atstart = s == env || *(s-1) == ',' || *(s-1) == ' ';
		s += len;
		if (atstart && (*s == ' ' || *s == ',' || *s == '\0')) {
			return 1;
		}
	}
	return 0;
}

static void
dumpflags(void)
{
	unsigned f = fz_cpuflags;
	int i, n;

	fputs("detected cpu features:", stdout);
	n = 0;
	for (i = 0; i < sizeof(features) / sizeof(featuretest); i++)
	{
		if (f & features[i].flag)
		{
			fputc(' ', stdout);
			fputs(features[i].name, stdout);
			n ++;
		}
	}
	if (!n)
		fputs(" none", stdout);
	fputc('\n', stdout);
}

#ifndef _WIN32

static sigjmp_buf jmpbuf;
static volatile sig_atomic_t canjump;

static void
sigillhandler(int sig)
{
	if (!canjump) {
		signal(sig, SIG_DFL);
		raise(sig);
	}

	canjump = 0;
	siglongjmp(jmpbuf, 1);
}

void fz_cpudetect(void)
{
	static int hasrun = 0;

	unsigned flags = 0;
	int i;
	void (*oldhandler)(int) = NULL;
	void (*tmphandler)(int);
	char *env;

	if (hasrun)
		return;
	hasrun = 1;

	env = getenv("CPUACCEL");

	for (i = 0; i < sizeof(features) / sizeof(featuretest); i++)
	{
		canjump = 0;

		tmphandler = signal(SIGILL, sigillhandler);
		if (!oldhandler)
			oldhandler = tmphandler;

		if (sigsetjmp(jmpbuf, 1))
		{
			/* test failed - disable feature */
			flags &= ~features[i].flag;
			continue;
		}

		canjump = 1;

		features[i].test();

#if defined(ARCH_X86) || defined(ARCH_X86_64)
		/* reset mmx/x87 pipeline state */
		if (features[i].flag & (HAVE_MMX | HAVE_3DNOW | HAVE_MMXEXT)) {
			__asm__ __volatile__ ("emms\n\t");
		}
#endif

		/* if we got here the test succeeded */
		if (enabled(env, features[i].name))
			flags |= features[i].flag;
		else
			flags &= ~features[i].flag;
	}

	/* restore previous signal handler */
	signal(SIGILL, oldhandler);

	fz_cpuflags = flags;

#if defined(ARCH_X86) || defined(ARCH_X86_64)
	__asm__ __volatile__ ("emms\n\t");
#endif

	dumpflags();
}

#else /* _WIN32 */

void fz_cpudetect(void)
{
	static int hasrun = 0;

	unsigned flags = 0;
	int i;
	char *env;

	if (hasrun)
		return;
	hasrun = 1;

	env = getenv("CPUACCEL");

	for (i = 0; i < sizeof(features) / sizeof(featuretest); i++)
	{
		__try
		{
			features[i].test();
		}
		__except(EXCEPTION_EXECUTE_HANDLER)
		{
			/* test failed - disable feature */
			flags &= ~features[i].flag;
			continue;
		}

#if defined(ARCH_X86) || defined(ARCH_X86_64)
		if (features[i].flag & (HAVE_MMX | HAVE_3DNOW | HAVE_MMXEXT)) {
			/* reset mmx/x87 pipeline state */
			__asm emms;
		}
#endif

		/* if we got here the test succeeded */
		if (enabled(env, features[i].name))
			flags |= features[i].flag;
		else
			flags &= ~features[i].flag;
	}

	fz_cpuflags = flags;

	dumpflags();
}


#endif

#endif