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111
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1 /* PR tree-optimization/80933 - redundant bzero/bcopy calls not eliminated
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2 { dg-do compile }
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3 { dg-options "-O0 -Wall -fdump-tree-gimple" } */
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4
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5 void f0 (void *dst, const void *src, unsigned n)
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6 {
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7 /* Bcopy(src, dst, ...) corresponds to memmove(dst, src, ...),
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8 with the first two arguments transposed, not memcpy. */
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9 __builtin_bcopy (src, dst, n);
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10 }
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11
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12 void f1 (void *p, const void *q, unsigned n)
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13 {
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14 /* A call with zero size should be eliminated. */
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15 __builtin_bcopy (q, p, 0);
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16 }
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17
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18 int f2 (const void *p, const void *q, unsigned n)
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19 {
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20 return __builtin_bcmp (p, q, n);
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21 }
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22
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23 int f3 (const void *p, const void *q)
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24 {
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25 /* A call with zero size should be folded into 0. */
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26 return __builtin_bcmp (p, q, 0);
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27 }
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28
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29 int f4 (const void *p, unsigned n)
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30 {
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31 /* A call with the same argument should also be folded into 0. */
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32 return __builtin_bcmp (p, p, n);
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33 }
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34
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35 void f5 (void *p, unsigned n)
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36 {
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37 __builtin_bzero (p, n);
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38 }
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39
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40 void f6 (void *p)
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41 {
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42 /* A call with zero size should be eliminated. */
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43 __builtin_bzero (p, 0);
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44 }
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45
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46 /* Verify that calls to bcmp, bcopy, and bzero have all been removed
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47 and one of each replaced with memcmp, memmove, and memset, respectively.
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48 The remaining three should be eliminated.
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49 { dg-final { scan-tree-dump-not "bcmp|bcopy|bzero" "gimple" } }
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50 { dg-final { scan-tree-dump-times "memcmp|memmove|memset" 3 "gimple" } }
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51
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52 Verify that the bcopy to memmove transformation correctly transposed
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53 the source and destination pointer arguments.
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54 { dg-final { scan-tree-dump-times "memmove \\(dst, src" 1 "gimple" } } */
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