[PATCH] D58821: Inline asm constraints: allow ICE-like pointers for the "n" constraint (PR40890)

[Joerg Sonnenberger via Phabricator via cfe-commits]

joerg added a comment.

Well, that was a sample to illustrate the point. A full working (and now failing) example is:

  static inline void outl(unsigned port, unsigned data) {
    if (__builtin_constant_p(port) && port < 0x100) {
      __asm volatile("outl %0,%w1" : : "a"(data), "n"(port));
    } else {
      __asm volatile("outl %0,%w1" : : "a"(data), "d"(port));
    }
  }
  
  void f(unsigned port) { outl(1, 1); }


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  https://reviews.llvm.org/D58821/new/

https://reviews.llvm.org/D58821