/* Test whether strncmp has not been "optimized" into memcmp
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/* Test whether strncmp has not been "optimized" into memcmp
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nor any code with memcmp semantics. */
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nor any code with memcmp semantics. */
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/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* *-*-darwin* } } */
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/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* *-*-darwin* } } */
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/* { dg-options "-O2" } */
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/* { dg-options "-O2" } */
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#include <stddef.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/mman.h>
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#ifndef MAP_ANONYMOUS
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS MAP_ANON
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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#endif
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#include <stdlib.h>
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#include <stdlib.h>
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|
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void __attribute__((noinline)) test (const char *p)
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void __attribute__((noinline)) test (const char *p)
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{
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{
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if (__builtin_strncmp (p, "abcdefghijklmnopq", 17) == 0)
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if (__builtin_strncmp (p, "abcdefghijklmnopq", 17) == 0)
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abort ();
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abort ();
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}
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}
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|
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int main (void)
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int main (void)
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{
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{
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char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,
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char *p = mmap (NULL, 131072, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (p == MAP_FAILED)
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if (p == MAP_FAILED)
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return 0;
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return 0;
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if (munmap (p + 65536, 65536) < 0)
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if (munmap (p + 65536, 65536) < 0)
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return 0;
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return 0;
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__builtin_memcpy (p + 65536 - 5, "abcd", 5);
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__builtin_memcpy (p + 65536 - 5, "abcd", 5);
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test (p + 65536 - 5);
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test (p + 65536 - 5);
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return 0;
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return 0;
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}
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}
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