[Bug tree-optimization/102579] Failure to optimize out allocation if volatile read is present in the middle

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102579

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |alias

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
But interesting GCC can remove malloc/free if the volatile was a non-local:
extern"C" void *malloc(decltype(sizeof(0)));
extern "C" void free(void*);
void test_unused(volatile int *a) {
  volatile int d;
  int *p;
  p = (int*)malloc(sizeof(int));
  d;
  free(p);
}

volatile int t;
void test_unused1(void) {
  int *p;
  p = (int*)malloc(sizeof(int));
  t;
  free(p);
}