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111
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1 /* Testcase derived from 20111227-1.c to ensure that REE is combining
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2 redundant zero extends with zero extend to wider mode. */
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3 /* { dg-do compile { target i?86-*-* x86_64-*-* } } */
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4 /* { dg-options "-fdump-rtl-ree -O -free" } */
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5
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6 extern void abort (void);
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7
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8 unsigned short s;
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9 unsigned int i;
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10 unsigned long l;
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11 unsigned char v = -1;
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12
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13 void __attribute__((noinline,noclone))
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14 bar (int t)
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15 {
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16 if (t == 2 && s != 0xff)
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17 abort ();
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18 if (t == 1 && i != 0xff)
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19 abort ();
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20 if (t == 0 && l != 0xff)
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21 abort ();
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22 }
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23
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24 void __attribute__((noinline,noclone))
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25 foo (unsigned char *a, int t)
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26 {
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27 unsigned char r = v;
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28
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29 if (t == 2)
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30 s = (unsigned short) r;
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31 else if (t == 1)
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32 i = (unsigned int) r;
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33 else if (t == 0)
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34 l = (unsigned long) r;
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35 bar (t);
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36 }
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37
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38 int main(void)
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39 {
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40 foo (&v, 0);
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41 foo (&v, 1);
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42 foo (&v, 2);
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43 return 0;
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44 }
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45 /* { dg-final { scan-rtl-dump "Elimination opportunities = 3 realized = 3" "ree" } } */
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