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111
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1 /* PR 71831 - __builtin_object_size poor results with no optimization
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2 Verify that even without optimization __builtin_object_size returns
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3 a meaningful result for a subset of simple expressins. In cases
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4 where the result could not easily be made to match the one obtained
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5 with optimization the built-in was made to fail instead. */
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6 /* { dg-do run } */
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7 /* { dg-options "-O0" } */
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8
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9 static int nfails;
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10
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11 #define TEST_FAILURE(line, obj, type, expect, result) \
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12 __builtin_printf ("FAIL: line %i: __builtin_object_size(" \
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13 #obj ", %i) == %zu, got %zu\n", \
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14 line, type, expect, result), ++nfails
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15
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16 #define bos(obj, type) __builtin_object_size (obj, type)
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17 #define size(obj, n) ((size_t)n == X ? sizeof *obj : (size_t)n)
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18
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19 #define test(expect, type, obj) \
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20 do { \
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21 if (bos (obj, type) != size (obj, expect)) \
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22 TEST_FAILURE (__LINE__, obj, type, size (obj, expect), bos (obj, type)); \
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23 } while (0)
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24
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25 #define T(r0, r1, r2, r3, obj) \
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26 do { \
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27 test (r0, 0, obj); \
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28 test (r1, 1, obj); \
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29 test (r2, 2, obj); \
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30 test (r3, 3, obj); \
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31 } while (0)
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32
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33 /* For convenience. Substitute for 'sizeof object' in test cases where
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34 the size can vary from target to target. */
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35 #define X (size_t)0xdeadbeef
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36
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37 /* __builtin_object_size checking results are inconsistent for equivalent
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38 expressions (see bug 71831). To avoid having duplicate the inconsistency
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39 at -O0 the built-in simply fails. The results hardcoded in this test
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40 are those obtained with optimization (for easy comparison) but without
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41 optimization the macros below turn them into expected failures . */
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42 #if __OPTIMIZE__
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43 # define F0(n) n
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44 # define F1(n) n
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45 # define F2(n) n
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46 # define F3(n) n
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47 #else
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48 # define F0(n) -1
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49 # define F1(n) -1
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50 # define F2(n) 0
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51 # define F3(n) 0
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52 #endif
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53
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54 typedef __SIZE_TYPE__ size_t;
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55
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56 extern char ax[];
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57 char ax2[]; /* { dg-warning "assumed to have one element" } */
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58
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59 extern char a0[0];
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60 static char a1[1];
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61 static char a2[2];
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62 static char a9[9];
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63
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64 #if __SIZEOF_SHORT__ == 4
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65 extern short ia0[0];
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66 static short ia1[1];
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67 static short ia9[9];
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68 #elif __SIZEOF_INT__ == 4
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69 extern int ia0[0];
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70 static int ia1[1];
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71 static int ia9[9];
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72 #elif __SIZEOF_LONG__ == 4
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73 extern long ia0[0];
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74 static long ia1[1];
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75 static long ia9[9];
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76 #endif
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77
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78 static char a2x2[2][2];
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79 static char a3x5[3][5];
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80
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81 struct Sx { char n, a[]; } sx;
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82 struct S0 { char n, a[0]; } s0;
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83 struct S1 { char n, a[1]; } s1;
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84 struct S2 { char n, a[2]; } s2;
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85 struct S9 { char n, a[9]; } s9;
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86
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87 struct S2x2 { char n, a[2][2]; } s2x2;
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88 struct S3x5 { char n, a[3][5]; } s3x5;
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89
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90 static __attribute__ ((noclone, noinline)) void
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91 test_arrays ()
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92 {
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93 T ( -1, -1, 0, 0, ax);
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94
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95 T ( 0, 0, 0, 0, a0);
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96 T ( 1, 1, 1, 1, ax2);
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97
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98 T ( 1, 1, 1, 1, a1);
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99 T ( 2, 2, 2, 2, a2);
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100 T ( 9, 9, 9, 9, a9);
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101
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102 T ( 0, 0, 0, 0, a0);
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103 T ( 1, 1, 1, 1, ax2);
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104
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105 T ( 0, 0, 0, 0, ia0);
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106 T ( 4, 4, 4, 4, ia1);
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107 T ( 36, 36, 36, 36, ia9);
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108
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109 /* Not all results for multidimensional arrays make sense (see
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110 bug 77293). The expected results below simply reflect those
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111 obtained at -O2 (modulo the known limitations at -O1). */
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112 T ( 4, 4, 4, 4, a2x2);
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113 T ( 4, 4, 4, 4, &a2x2[0]);
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114 T ( 4, 2, 4, 2, &a2x2[0][0]);
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115 T ( 0, F1 (0), 0, 0, &a2x2 + 1);
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116 T ( 2, F1 ( 2), 2, F3 ( 2), &a2x2[0] + 1);
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117 T ( 3, F1 ( 1), 3, F3 ( 3), &a2x2[0][0] + 1);
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118
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119 T ( 15, 15, 15, 15, a3x5);
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120 T ( 15, 5, 15, 5, &a3x5[0][0] + 0);
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121 T ( 14, F1 ( 4), 14, F3 (14), &a3x5[0][0] + 1);
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122
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123 T ( 1, 1, 1, 1, a1 + 0);
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124 T ( 0, F1 (0), 0, 0, a1 + 1);
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125 T ( 0, F1 ( 0), 0, 0, &a1 + 1);
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126 /* In the following the offset is out of bounds which makes
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127 the expression undefined. Still, verify that the returned
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128 size is zero (and not some large number). */
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129 T ( 0, F1 (0), 0, 0, a1 + 2);
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130
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131 T ( 2, 2, 2, 2, a2 + 0);
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132 T ( 1, F1 ( 1), 1, F3 ( 1), a2 + 1);
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133 T ( 0, F1 ( 0), 0, 0, a2 + 2);
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134 }
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135
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136 static __attribute__ ((noclone, noinline)) void
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137 test_structs (struct Sx *psx, struct S0 *ps0, struct S1 *ps1, struct S9 *ps9)
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138 {
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139 /* The expected size of a declared object with a flexible array member
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140 is sizeof sx in all __builtin_object_size types. */
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141 T ( X, X, X, X, &sx);
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142
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143 /* The expected size of an unknown object with a flexible array member
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144 is unknown in all __builtin_object_size types. */
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145 T ( -1, -1, 0, 0, psx);
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146
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147 /* The expected size of a flexible array member of a declared object
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148 is zero. */
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149 T ( 0, 0, 0, 0, sx.a);
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150
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151 /* The expected size of a flexible array member of an unknown object
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152 is unknown. */
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153 T ( -1, -1, 0, 0, psx->a);
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154
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155 /* The expected size of a declared object with a zero-length array member
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156 is sizeof sx in all __builtin_object_size types. */
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157 T ( X, X, X, X, &s0);
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158
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159 /* The expected size of an unknown object with a zero-length array member
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160 is unknown in all __builtin_object_size types. */
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161 T ( -1, -1, 0, 0, ps0);
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162
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163 /* The expected size of a zero-length array member of a declared object
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164 is zero. */
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165 T ( 0, 0, 0, 0, s0.a);
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166
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167 /* The expected size of a zero-length array member of an unknown object
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168 is unknown. */
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169 T ( -1, -1, 0, 0, ps0->a);
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170
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171 T ( X, X, X, X, &s1);
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172 T ( 1, 1, 1, 1, s1.a);
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173 T ( 0, F1 (0), 0, 0, s1.a + 1);
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174
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175 /* GCC treats arrays of all sizes that are the last member of a struct
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176 as flexible array members. */
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177 T ( -1, -1, 0, 0, ps1);
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178 T ( -1, -1, 0, 0, ps1->a);
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179 T ( -1, -1, 0, 0, ps1->a + 1);
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180
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181 T ( X, X, X, X, &s9);
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182 T ( 9, 9, 9, 9, s9.a);
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183 T ( 9, 9, 9, 9, s9.a + 0);
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184 T ( 8, F1 ( 8), 8, F3 ( 8), s9.a + 1);
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185 T ( 7, F1 ( 7), 7, F3 ( 7), s9.a + 2);
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186 T ( 0, F1 ( 0), 0, F3 ( 0), s9.a + 9);
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187
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188 /* The following make little sense but see bug 77301. */
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189 T ( -1, -1, 0, 0, ps9);
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190 T ( -1, -1, 0, 0, ps9->a);
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191 T ( -1, -1, 0, 0, ps9->a + 1);
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192 }
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193
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194 int
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195 main()
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196 {
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197 test_arrays ();
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198
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199 test_structs (&sx, &s0, &s1, &s9);
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200
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201 if (nfails)
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202 __builtin_abort ();
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203
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204 return 0;
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205 }
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