[Bug tree-optimization/97603] Failure to optimize out compare into reuse of subtraction result

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97603

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #1)
> Shouldn't it be marked as target issue for x86?

Or you means that middle-end should transform code to

int g();

int f(int a, int b)
{
  int c = a - b;
  if (c)
    return c;
  return g();
}