gcc/testsuite/gcc.dg/pr97750.c


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/* PR tree-optimization/97750 */
/* { dg-do compile } */
/* { dg-options "-O2 -Wall -Wextra" } */

char CopyPlane_src;
long CopyPlane_copy_pitch;
char *CopyFromUswc_src;
int CopyFromUswc_height;
void CopyPlane(char *dst) {
  __builtin_memcpy(dst, &CopyPlane_src, CopyPlane_copy_pitch);
}
void CopyFromUswc(long src_pitch) {
  char *dst;
  for (; CopyFromUswc_height;) {
    unsigned unaligned = (long)CopyFromUswc_src;
    if (unaligned)
      CopyPlane(&dst[unaligned]);  /* { dg-warning "may be used uninitialized" } */
    CopyFromUswc_src += src_pitch;
  }
}