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1 /* { dg-do compile } */
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2 /* { dg-require-effective-target int128 } */
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3 /* { dg-options "-Os -fdump-tree-vrp1-details" } */
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4
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5 #include <stdint.h>
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6 #include <limits.h>
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7
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8 typedef unsigned int word __attribute__((mode(word)));
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9 typedef unsigned __int128 bigger_than_word;
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10
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11 int
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12 foo (bigger_than_word a, word b, uint8_t c)
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13 {
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14 /* Must fold use of t1 into use of b, as b is no wider than word_mode. */
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15 const uint8_t t1 = b % UCHAR_MAX;
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16
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17 /* Must NOT fold use of t2 into use of a, as a is wider than word_mode. */
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18 const uint8_t t2 = a % UCHAR_MAX;
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19
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20 /* Must fold use of t3 into use of c, as c is narrower than t3. */
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21 const uint32_t t3 = (const uint32_t)(c >> 1);
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22
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23 uint16_t ret = 0;
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24
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25 if (t1 == 1)
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26 ret = 20;
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27 else if (t2 == 2)
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28 ret = 30;
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29 else if (t3 == 3)
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30 ret = 40;
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31 /* Th extra condition below is necessary to prevent a prior pass from
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32 folding away the cast. Ignored in scan-tree-dump. */
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33 else if (t3 == 4)
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34 ret = 50;
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35
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36 return ret;
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37 }
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38
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39 /* { dg-final { scan-tree-dump "Folded into: if \\(_\[0-9\]+ == 1\\)" "vrp1" } } */
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40 /* { dg-final { scan-tree-dump-not "Folded into: if \\(_\[0-9\]+ == 2\\)" "vrp1" } } */
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41 /* { dg-final { scan-tree-dump "Folded into: if \\(_\[0-9\]+ == 3\\)" "vrp1" } } */
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