gcc/testsuite/gcc.dg/pr87054.c


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// { dg-do run }
// { dg-options "-O2" }

#ifndef T
# if __SIZEOF_INT128__ && defined __SSE__
#  define T __int128
# else
#  define T long
# endif
#endif
#ifndef R
# ifdef __SSE__
#  define R "x"
# else
#  define R "r"
# endif
#endif


typedef T A; // #define T to long or __int128
struct B { char d; A c; } __attribute__((packed));
struct B b[50]; // many elements to avoid loop unrolling

int main () {
  int i;
  for (i = 0; i < sizeof(b) / sizeof(*b); i++) {
    asm ("" : "+" R (b[i].c)); // #define R to "r" on ppc or "x" on x86_64
  }
}