test-i386-fbstp.c (5111B)
1 /* Test fbstp instruction. */ 2 3 #include <stdint.h> 4 #include <stdio.h> 5 #include <string.h> 6 7 union u { 8 struct { uint64_t sig; uint16_t sign_exp; } s; 9 long double ld; 10 }; 11 12 volatile union u ld_invalid_1 = { .s = { 1, 1234 } }; 13 volatile union u ld_invalid_2 = { .s = { 0, 1234 } }; 14 volatile union u ld_invalid_3 = { .s = { 0, 0x7fff } }; 15 volatile union u ld_invalid_4 = { .s = { (UINT64_C(1) << 63) - 1, 0x7fff } }; 16 17 int main(void) 18 { 19 int ret = 0; 20 unsigned char out[10]; 21 memset(out, 0xfe, sizeof out); 22 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-0.0L) : "st"); 23 out[9] &= 0x80; 24 if (memcmp(out, "\0\0\0\0\0\0\0\0\0\x80", sizeof out) != 0) { 25 printf("FAIL: fbstp -0\n"); 26 ret = 1; 27 } 28 memset(out, 0x12, sizeof out); 29 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-0.1L) : "st"); 30 out[9] &= 0x80; 31 if (memcmp(out, "\0\0\0\0\0\0\0\0\0\x80", sizeof out) != 0) { 32 printf("FAIL: fbstp -0.1\n"); 33 ret = 1; 34 } 35 memset(out, 0x1f, sizeof out); 36 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-987654321987654321.0L) : 37 "st"); 38 out[9] &= 0x80; 39 if (memcmp(out, "\x21\x43\x65\x87\x19\x32\x54\x76\x98\x80", 40 sizeof out) != 0) { 41 printf("FAIL: fbstp -987654321987654321\n"); 42 ret = 1; 43 } 44 memset(out, 0x12, sizeof out); 45 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (999999999999999999.5L) : 46 "st"); 47 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 48 printf("FAIL: fbstp 999999999999999999.5\n"); 49 ret = 1; 50 } 51 memset(out, 0x12, sizeof out); 52 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (1000000000000000000.0L) : 53 "st"); 54 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 55 printf("FAIL: fbstp 1000000000000000000\n"); 56 ret = 1; 57 } 58 memset(out, 0x12, sizeof out); 59 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (1e30L) : "st"); 60 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 61 printf("FAIL: fbstp 1e30\n"); 62 ret = 1; 63 } 64 memset(out, 0x12, sizeof out); 65 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-999999999999999999.5L) : 66 "st"); 67 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 68 printf("FAIL: fbstp -999999999999999999.5\n"); 69 ret = 1; 70 } 71 memset(out, 0x12, sizeof out); 72 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-1000000000000000000.0L) : 73 "st"); 74 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 75 printf("FAIL: fbstp -1000000000000000000\n"); 76 ret = 1; 77 } 78 memset(out, 0x12, sizeof out); 79 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-1e30L) : "st"); 80 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 81 printf("FAIL: fbstp -1e30\n"); 82 ret = 1; 83 } 84 memset(out, 0x12, sizeof out); 85 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (__builtin_infl()) : "st"); 86 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 87 printf("FAIL: fbstp inf\n"); 88 ret = 1; 89 } 90 memset(out, 0x12, sizeof out); 91 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-__builtin_infl()) : 92 "st"); 93 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 94 printf("FAIL: fbstp -inf\n"); 95 ret = 1; 96 } 97 memset(out, 0x12, sizeof out); 98 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (__builtin_nanl("")) : 99 "st"); 100 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 101 printf("FAIL: fbstp nan\n"); 102 ret = 1; 103 } 104 memset(out, 0x12, sizeof out); 105 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (-__builtin_nanl("")) : 106 "st"); 107 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 108 printf("FAIL: fbstp -nan\n"); 109 ret = 1; 110 } 111 memset(out, 0x12, sizeof out); 112 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_1.ld) : 113 "st"); 114 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 115 printf("FAIL: fbstp invalid 1\n"); 116 ret = 1; 117 } 118 memset(out, 0x12, sizeof out); 119 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_2.ld) : 120 "st"); 121 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 122 printf("FAIL: fbstp invalid 2\n"); 123 ret = 1; 124 } 125 memset(out, 0x12, sizeof out); 126 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_3.ld) : 127 "st"); 128 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 129 printf("FAIL: fbstp invalid 3\n"); 130 ret = 1; 131 } 132 memset(out, 0x12, sizeof out); 133 __asm__ volatile ("fbstp %0" : "=m" (out) : "t" (ld_invalid_4.ld) : 134 "st"); 135 if (memcmp(out, "\0\0\0\0\0\0\0\xc0\xff\xff", sizeof out) != 0) { 136 printf("FAIL: fbstp invalid 4\n"); 137 ret = 1; 138 } 139 return ret; 140 }