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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [gcc/] [testsuite/] [gcc.dg/] [duff-1.c] - Rev 12
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/* Duff's device is legal C; test to make sure the compiler doesn't complain about it. Jason Thorpe <thorpej@wasabisystems.com> Derived from PR 3846. */ /* { dg-do run } */ /* { dg-options "-O2" } */ extern void abort (void); extern void exit (int); typedef __SIZE_TYPE__ size_t; extern int memcmp (const void *, const void *, size_t); void duffcpy (char *dst, const char *src, unsigned long size) { switch (size & 3) { for (;;) { *dst++ = *src++; case 3: *dst++ = *src++; case 2: *dst++ = *src++; case 1: *dst++ = *src++; case 0: if (size <= 3) break; size -= 4; } } } const char testpat[] = "The quick brown fox jumped over the lazy dog."; int main() { char buf[64]; duffcpy (buf, testpat, sizeof (testpat)); if (memcmp (buf, testpat, sizeof (testpat)) != 0) abort (); exit (0); }