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689 |
jeremybenn |
/* { dg-do run } */
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/* { dg-options "-O2 -fdump-tree-strlen -fdump-tree-optimized" } */
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#include "strlenopt.h"
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__attribute__((noinline, noclone)) char *
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fn1 (int r)
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{
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char *p = r ? "a" : "bc";
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/* String length for p varies, therefore strchr below isn't
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optimized away. */
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return strchr (p, '\0');
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}
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__attribute__((noinline, noclone)) size_t
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fn2 (int r)
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{
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char *p, q[10];
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strcpy (q, "abc");
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p = r ? "a" : q;
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/* String length for p varies, therefore strlen below isn't
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optimized away. */
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return strlen (p);
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}
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__attribute__((noinline, noclone)) size_t
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fn3 (char *p, int n)
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{
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int i;
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p = strchr (p, '\0');
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/* strcat here can be optimized into memcpy. */
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strcat (p, "abcd");
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for (i = 0; i < n; i++)
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if ((i % 123) == 53)
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/* strcat here is optimized into strlen and memcpy. */
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strcat (p, "efg");
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/* The strlen here can't be optimized away, as in the loop string
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length of p might change. */
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return strlen (p);
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}
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char buf[64];
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__attribute__((noinline, noclone)) size_t
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fn4 (char *x, int n)
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{
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int i;
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size_t l;
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char a[64];
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char *p = strchr (x, '\0');
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/* strcpy here is optimized into memcpy, length computed as p - x + 1. */
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strcpy (a, x);
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/* strcat here is optimized into memcpy. */
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strcat (p, "abcd");
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for (i = 0; i < n; i++)
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if ((i % 123) == 53)
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/* strcat here is optimized into strlen and memcpy. */
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strcat (a, "efg");
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/* The strlen should be optimized here into 4. */
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l = strlen (p);
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/* This stays strcpy. */
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strcpy (buf, a);
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return l;
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}
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int
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main ()
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{
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volatile int l = 1;
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char b[64];
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if (memcmp (fn1 (l) - 1, "a", 2) != 0)
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abort ();
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if (memcmp (fn1 (!l) - 2, "bc", 3) != 0)
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abort ();
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if (fn2 (l) != 1 || fn2 (!l) != 3)
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abort ();
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memset (b, '\0', sizeof b);
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memset (b, 'a', 3);
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if (fn3 (b, 10) != 4 || memcmp (b, "aaaabcd", 8) != 0)
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abort ();
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if (fn3 (b, 128) != 7 || memcmp (b, "aaaabcdabcdefg", 15) != 0)
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abort ();
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if (fn3 (b, 256) != 10 || memcmp (b, "aaaabcdabcdefgabcdefgefg", 25) != 0)
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abort ();
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if (fn4 (b, 10) != 4
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|| memcmp (b, "aaaabcdabcdefgabcdefgefgabcd", 29) != 0
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|| memcmp (buf, "aaaabcdabcdefgabcdefgefg", 25) != 0)
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abort ();
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if (fn4 (b, 128) != 4
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|| memcmp (b, "aaaabcdabcdefgabcdefgefgabcdabcd", 33) != 0
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|| memcmp (buf, "aaaabcdabcdefgabcdefgefgabcdefg", 32) != 0)
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abort ();
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if (fn4 (b, 256) != 4
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|| memcmp (b, "aaaabcdabcdefgabcdefgefgabcdabcdabcd", 37) != 0
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|| memcmp (buf, "aaaabcdabcdefgabcdefgefgabcdabcdefgefg", 39) != 0)
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abort ();
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return 0;
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}
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/* { dg-final { scan-tree-dump-times "strlen \\(" 4 "strlen" } } */
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/* { dg-final { scan-tree-dump-times "memcpy \\(" 6 "strlen" } } */
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/* { dg-final { scan-tree-dump-times "strcpy \\(" 1 "strlen" } } */
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/* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */
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/* { dg-final { scan-tree-dump-times "strchr \\(" 3 "strlen" } } */
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/* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */
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/* { dg-final { cleanup-tree-dump "strlen" } } */
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/* { dg-final { scan-tree-dump-times "return 4;" 1 "optimized" } } */
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/* { dg-final { cleanup-tree-dump "optimized" } } */
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