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annotate gcc/testsuite/gcc.dg/uninit-29-gimple.c @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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145
1830386684a0 gcc-9.2.0
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1 /* { dg-do compile } */
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2 /* { dg-options "-fgimple -O -Wmaybe-uninitialized" } */
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3
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4 unsigned int __GIMPLE (ssa,startwith("uninit1"))
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5 foo (unsigned int v)
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6 {
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7 unsigned int undef; /* { dg-warning "may be used uninitialized" } */
1830386684a0 gcc-9.2.0
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8 unsigned int _2;
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9 unsigned int _9;
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10 unsigned int _10;
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11 unsigned pred;
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12
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13 __BB(2):
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14 pred = v_4(D) & 3u;
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15 if (pred != 0u)
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16 goto __BB3;
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17 else
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18 goto __BB4;
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19
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20 /* 'undef' is defined conditionally (under 'v & 3' predicate) */
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21 __BB(3):
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22 undef_8 = 8u;
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23 goto __BB4;
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24
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25 /* An undef value flows into a phi. */
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26 __BB(4):
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27 undef_1 = __PHI (__BB2: undef_5(D), __BB3: undef_8);
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28 if (v_4(D) != 16u)
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29 goto __BB5;
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30 else
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31 goto __BB6;
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32
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33 /* The phi value is used here (under 'v != 16' predicate). */
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34 __BB(5):
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35 _9 = undef_1;
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36 goto __BB7;
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37
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38 __BB(6):
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39 _10 = v_4(D);
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40 goto __BB7;
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41
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42 __BB(7):
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43 _2 = __PHI (__BB5: _9, __BB6: _10);
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44 return _2;
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45 }