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jeremybenn |
/* { dg-do run } */
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/* { dg-options "-O2 -fdump-tree-strlen" } */
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#include "strlenopt.h"
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/* If stpcpy can't be used, this is optimized into
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strcpy (p, q); strcat (p, r); memcpy (p + strlen (p), "abcd", 5);
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If stpcpy can be used (see strlenopt-4g.c test),
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this is optimized into
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memcpy (stpcpy (stpcpy (p, q), r), "abcd", 5); */
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__attribute__((noinline, noclone)) void
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foo (char *p, const char *q, const char *r)
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{
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strcpy (p, q);
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strcat (p, r);
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strcat (p, "abcd");
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}
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/* If stpcpy can't be used, this is optimized into
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memcpy (p, "abcd", 4); strcpy (p + 4, q); strcat (p, r);
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If stpcpy can be used, this is optimized into
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memcpy (p, "abcd", 4); strcpy (stpcpy (p + 4, q), r); */
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__attribute__((noinline, noclone)) void
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bar (char *p, const char *q, const char *r)
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{
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strcpy (p, "abcd");
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strcat (p, q);
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strcat (p, r);
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}
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/* If stpcpy can't be used, this is optimized into
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strcat (p, q); memcpy (t1 = p + strlen (p), "abcd", 4);
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strcpy (t1 + 4, r); memcpy (p + strlen (p), "efgh", 5);
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If stpcpy can be used, this is optimized into
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t1 = stpcpy (p + strlen (p), q); memcpy (t1, "abcd", 4);
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memcpy (stpcpy (t1 + 4, r), "efgh", 5); */
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__attribute__((noinline, noclone)) void
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baz (char *p, const char *q, const char *r)
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{
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strcat (p, q);
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strcat (p, "abcd");
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strcat (p, r);
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strcat (p, "efgh");
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}
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char buf[64];
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int
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main ()
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{
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char *volatile p = buf;
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const char *volatile q = "ij";
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const char *volatile r = "klmno";
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foo (p, q, r);
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if (memcmp (buf, "ijklmnoabcd\0\0\0\0\0\0\0\0", 20) != 0)
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abort ();
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memset (buf, '\0', sizeof buf);
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bar (p, q, r);
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if (memcmp (buf, "abcdijklmno\0\0\0\0\0\0\0\0", 20) != 0)
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abort ();
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memset (buf, 'v', 3);
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memset (buf + 3, '\0', -3 + sizeof buf);
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baz (p, q, r);
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if (memcmp (buf, "vvvijabcdklmnoefgh\0", 20) != 0)
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abort ();
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return 0;
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}
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/* For targets providing a movstr pattern strcat is already decomposed
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into strlen + strcpy by fold_builtin_strcat. */
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/* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen" { target { ! s390*-*-* } } } } */
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/* { dg-final { scan-tree-dump-times "strlen \\(" 6 "strlen" { target s390*-*-* } } } */
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/* { dg-final { scan-tree-dump-times "memcpy \\(" 4 "strlen" } } */
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/* { dg-final { scan-tree-dump-times "strcpy \\(" 3 "strlen" { target { ! s390*-*-* } } } } */
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/* { dg-final { scan-tree-dump-times "strcpy \\(" 6 "strlen" { target s390*-*-* } } } */
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/* { dg-final { scan-tree-dump-times "strcat \\(" 3 "strlen" { target { ! s390*-*-* } } } } */
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/* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" { target s390*-*-* } } } */
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/* { dg-final { scan-tree-dump-times "strchr \\(" 0 "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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