118c53e1eSJoseph Myers /* Test fbstp instruction. */
218c53e1eSJoseph Myers
3*374ff4d0SJoseph Myers #include <stdint.h>
418c53e1eSJoseph Myers #include <stdio.h>
518c53e1eSJoseph Myers #include <string.h>
618c53e1eSJoseph Myers
7*374ff4d0SJoseph Myers union u {
8*374ff4d0SJoseph Myers struct { uint64_t sig; uint16_t sign_exp; } s;
9*374ff4d0SJoseph Myers long double ld;
10*374ff4d0SJoseph Myers };
11*374ff4d0SJoseph Myers
12*374ff4d0SJoseph Myers volatile union u ld_invalid_1 = { .s = { 1, 1234 } };
13*374ff4d0SJoseph Myers volatile union u ld_invalid_2 = { .s = { 0, 1234 } };
14*374ff4d0SJoseph Myers volatile union u ld_invalid_3 = { .s = { 0, 0x7fff } };
15*374ff4d0SJoseph Myers volatile union u ld_invalid_4 = { .s = { (UINT64_C(1) << 63) - 1, 0x7fff } };
16*374ff4d0SJoseph Myers
main(void)1718c53e1eSJoseph Myers int main(void)
1818c53e1eSJoseph Myers {
1918c53e1eSJoseph Myers int ret = 0;
2018c53e1eSJoseph Myers unsigned char out[10];
2118c53e1eSJoseph Myers memset(out, 0xfe, sizeof out);
2218c53e1eSJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-0.0L) : "st");
2318c53e1eSJoseph Myers out[9] &= 0x80;
2418c53e1eSJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\0\0\x80", sizeof out) != 0) {
2518c53e1eSJoseph Myers printf("FAIL: fbstp -0\n");
2618c53e1eSJoseph Myers ret = 1;
2718c53e1eSJoseph Myers }
2818c53e1eSJoseph Myers memset(out, 0x12, sizeof out);
2918c53e1eSJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-0.1L) : "st");
3018c53e1eSJoseph Myers out[9] &= 0x80;
3118c53e1eSJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\0\0\x80", sizeof out) != 0) {
3218c53e1eSJoseph Myers printf("FAIL: fbstp -0.1\n");
3318c53e1eSJoseph Myers ret = 1;
3418c53e1eSJoseph Myers }
35*374ff4d0SJoseph Myers memset(out, 0x1f, sizeof out);
36*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-987654321987654321.0L) :
37*374ff4d0SJoseph Myers "st");
38*374ff4d0SJoseph Myers out[9] &= 0x80;
39*374ff4d0SJoseph Myers if (memcmp(out, "\x21\x43\x65\x87\x19\x32\x54\x76\x98\x80",
40*374ff4d0SJoseph Myers sizeof out) != 0) {
41*374ff4d0SJoseph Myers printf("FAIL: fbstp -987654321987654321\n");
42*374ff4d0SJoseph Myers ret = 1;
43*374ff4d0SJoseph Myers }
44*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
45*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (999999999999999999.5L) :
46*374ff4d0SJoseph Myers "st");
47*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
48*374ff4d0SJoseph Myers printf("FAIL: fbstp 999999999999999999.5\n");
49*374ff4d0SJoseph Myers ret = 1;
50*374ff4d0SJoseph Myers }
51*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
52*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (1000000000000000000.0L) :
53*374ff4d0SJoseph Myers "st");
54*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
55*374ff4d0SJoseph Myers printf("FAIL: fbstp 1000000000000000000\n");
56*374ff4d0SJoseph Myers ret = 1;
57*374ff4d0SJoseph Myers }
58*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
59*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (1e30L) : "st");
60*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
61*374ff4d0SJoseph Myers printf("FAIL: fbstp 1e30\n");
62*374ff4d0SJoseph Myers ret = 1;
63*374ff4d0SJoseph Myers }
64*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
65*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-999999999999999999.5L) :
66*374ff4d0SJoseph Myers "st");
67*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
68*374ff4d0SJoseph Myers printf("FAIL: fbstp -999999999999999999.5\n");
69*374ff4d0SJoseph Myers ret = 1;
70*374ff4d0SJoseph Myers }
71*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
72*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-1000000000000000000.0L) :
73*374ff4d0SJoseph Myers "st");
74*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
75*374ff4d0SJoseph Myers printf("FAIL: fbstp -1000000000000000000\n");
76*374ff4d0SJoseph Myers ret = 1;
77*374ff4d0SJoseph Myers }
78*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
79*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-1e30L) : "st");
80*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
81*374ff4d0SJoseph Myers printf("FAIL: fbstp -1e30\n");
82*374ff4d0SJoseph Myers ret = 1;
83*374ff4d0SJoseph Myers }
84*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
85*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (__builtin_infl()) : "st");
86*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
87*374ff4d0SJoseph Myers printf("FAIL: fbstp inf\n");
88*374ff4d0SJoseph Myers ret = 1;
89*374ff4d0SJoseph Myers }
90*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
91*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-__builtin_infl()) :
92*374ff4d0SJoseph Myers "st");
93*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
94*374ff4d0SJoseph Myers printf("FAIL: fbstp -inf\n");
95*374ff4d0SJoseph Myers ret = 1;
96*374ff4d0SJoseph Myers }
97*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
98*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (__builtin_nanl("")) :
99*374ff4d0SJoseph Myers "st");
100*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
101*374ff4d0SJoseph Myers printf("FAIL: fbstp nan\n");
102*374ff4d0SJoseph Myers ret = 1;
103*374ff4d0SJoseph Myers }
104*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
105*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-__builtin_nanl("")) :
106*374ff4d0SJoseph Myers "st");
107*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
108*374ff4d0SJoseph Myers printf("FAIL: fbstp -nan\n");
109*374ff4d0SJoseph Myers ret = 1;
110*374ff4d0SJoseph Myers }
111*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
112*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_1.ld) :
113*374ff4d0SJoseph Myers "st");
114*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
115*374ff4d0SJoseph Myers printf("FAIL: fbstp invalid 1\n");
116*374ff4d0SJoseph Myers ret = 1;
117*374ff4d0SJoseph Myers }
118*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
119*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_2.ld) :
120*374ff4d0SJoseph Myers "st");
121*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
122*374ff4d0SJoseph Myers printf("FAIL: fbstp invalid 2\n");
123*374ff4d0SJoseph Myers ret = 1;
124*374ff4d0SJoseph Myers }
125*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
126*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_3.ld) :
127*374ff4d0SJoseph Myers "st");
128*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
129*374ff4d0SJoseph Myers printf("FAIL: fbstp invalid 3\n");
130*374ff4d0SJoseph Myers ret = 1;
131*374ff4d0SJoseph Myers }
132*374ff4d0SJoseph Myers memset(out, 0x12, sizeof out);
133*374ff4d0SJoseph Myers __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_4.ld) :
134*374ff4d0SJoseph Myers "st");
135*374ff4d0SJoseph Myers if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) {
136*374ff4d0SJoseph Myers printf("FAIL: fbstp invalid 4\n");
137*374ff4d0SJoseph Myers ret = 1;
138*374ff4d0SJoseph Myers }
13918c53e1eSJoseph Myers return ret;
14018c53e1eSJoseph Myers }
141