summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/x86/test_FCOMI.c
blob: aec6692c6dcf80fa08cda06ab9d1aec461591a05 (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
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
// SPDX-License-Identifier: GPL-2.0
#undef _GNU_SOURCE
#define _GNU_SOURCE 1
#undef __USE_GNU
#define __USE_GNU 1
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <fenv.h>

enum {
	CF = 1 << 0,
	PF = 1 << 2,
	ZF = 1 << 6,
	ARITH = CF | PF | ZF,
};

long res_fcomi_pi_1;
long res_fcomi_1_pi;
long res_fcomi_1_1;
long res_fcomi_nan_1;
/* sNaN is s|111 1111 1|1xx xxxx xxxx xxxx xxxx xxxx */
/* qNaN is s|111 1111 1|0xx xxxx xxxx xxxx xxxx xxxx (some x must be nonzero) */
int snan = 0x7fc11111;
int qnan = 0x7f811111;
unsigned short snan1[5];
/* sNaN80 is s|111 1111 1111 1111 |10xx xx...xx (some x must be nonzero) */
unsigned short snan80[5] = { 0x1111, 0x1111, 0x1111, 0x8111, 0x7fff };

int test(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"

	"	push	%0""\n"
	"	popf""\n"
	"	fld1""\n"
	"	fldpi""\n"
	"	fcomi	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	ffree	%%st(1)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_1_pi""\n"

	"	push	%0""\n"
	"	popf""\n"
	"	fldpi""\n"
	"	fld1""\n"
	"	fcomi	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	ffree	%%st(1)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_pi_1""\n"

	"	push	%0""\n"
	"	popf""\n"
	"	fld1""\n"
	"	fld1""\n"
	"	fcomi	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	ffree	%%st(1)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_1_1""\n"
	:
	: "r" (flags)
	);
	if ((res_fcomi_1_pi & ARITH) != (0)) {
		printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
		return 1;
	}
	if ((res_fcomi_pi_1 & ARITH) != (CF)) {
		printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
		return 1;
	}
	if ((res_fcomi_1_1 & ARITH) != (ZF)) {
		printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

int test_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
	"	push	%0""\n"
	"	popf""\n"
	"	flds	qnan""\n"
	"	fld1""\n"
	"	fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"	fcomi	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	ffree	%%st(1)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_nan_1""\n"
	:
	: "r" (flags)
	);
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != FE_INVALID) {
		printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
		return 1;
	}
	return 0;
}

int testu_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
	"	push	%0""\n"
	"	popf""\n"
	"	flds	qnan""\n"
	"	fld1""\n"
	"	fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"	fucomi	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	ffree	%%st(1)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_nan_1""\n"
	:
	: "r" (flags)
	);
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

int testu_snan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
	"	push	%0""\n"
	"	popf""\n"
//	"	flds	snan""\n"	// WRONG, this will convert 32-bit fp snan to a *qnan* in 80-bit fp register!
//	"	fstpt	snan1""\n"	// if uncommented, it prints "snan1:7fff c111 1100 0000 0000" - c111, not 8111!
//	"	fnclex""\n"		// flds of a snan raised FE_INVALID, clear it
	"	fldt	snan80""\n"	// fldt never raise FE_INVALID
	"	fld1""\n"
	"	fucomi	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	ffree	%%st(1)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_nan_1""\n"
	:
	: "r" (flags)
	);
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
//	printf("snan:%x snan1:%04x %04x %04x %04x %04x\n", snan, snan1[4], snan1[3], snan1[2], snan1[1], snan1[0]);
	if (fetestexcept(FE_INVALID) != FE_INVALID) {
		printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
		return 1;
	}
	return 0;
}

int testp(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"

	"	push	%0""\n"
	"	popf""\n"
	"	fld1""\n"
	"	fldpi""\n"
	"	fcomip	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_1_pi""\n"

	"	push	%0""\n"
	"	popf""\n"
	"	fldpi""\n"
	"	fld1""\n"
	"	fcomip	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_pi_1""\n"

	"	push	%0""\n"
	"	popf""\n"
	"	fld1""\n"
	"	fld1""\n"
	"	fcomip	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_1_1""\n"
	:
	: "r" (flags)
	);
	if ((res_fcomi_1_pi & ARITH) != (0)) {
		printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
		return 1;
	}
	if ((res_fcomi_pi_1 & ARITH) != (CF)) {
		printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
		return 1;
	}
	if ((res_fcomi_1_1 & ARITH) != (ZF)) {
		printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

int testp_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
	"	push	%0""\n"
	"	popf""\n"
	"	flds	qnan""\n"
	"	fld1""\n"
	"	fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"	fcomip	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_nan_1""\n"
	:
	: "r" (flags)
	);
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != FE_INVALID) {
		printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
		return 1;
	}
	return 0;
}

int testup_qnan(long flags)
{
	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm ("\n"
	"	push	%0""\n"
	"	popf""\n"
	"	flds	qnan""\n"
	"	fld1""\n"
	"	fnclex""\n"		// fld of a qnan raised FE_INVALID, clear it
	"	fucomip	%%st(1), %%st" "\n"
	"	ffree	%%st(0)" "\n"
	"	pushf""\n"
	"	pop	res_fcomi_nan_1""\n"
	:
	: "r" (flags)
	);
	if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
		printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
		return 1;
	}
	if (fetestexcept(FE_INVALID) != 0) {
		printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
		return 1;
	}
	return 0;
}

void sighandler(int sig)
{
	printf("[FAIL]\tGot signal %d, exiting\n", sig);
	exit(1);
}

int main(int argc, char **argv, char **envp)
{
	int err = 0;

	/* SIGILL triggers on 32-bit kernels w/o fcomi emulation
	 * when run with "no387 nofxsr". Other signals are caught
	 * just in case.
	 */
	signal(SIGILL, sighandler);
	signal(SIGFPE, sighandler);
	signal(SIGSEGV, sighandler);

	printf("[RUN]\tTesting f[u]comi[p] instructions\n");
	err |= test(0);
	err |= test_qnan(0);
	err |= testu_qnan(0);
	err |= testu_snan(0);
	err |= test(CF|ZF|PF);
	err |= test_qnan(CF|ZF|PF);
	err |= testu_qnan(CF|ZF|PF);
	err |= testu_snan(CF|ZF|PF);
	err |= testp(0);
	err |= testp_qnan(0);
	err |= testup_qnan(0);
	err |= testp(CF|ZF|PF);
	err |= testp_qnan(CF|ZF|PF);
	err |= testup_qnan(CF|ZF|PF);
	if (!err)
		printf("[OK]\tf[u]comi[p]\n");
	else
		printf("[FAIL]\tf[u]comi[p] errors: %d\n", err);

	return err;
}