gcc/testsuite/gcc.target/i386/pr39804.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target ilp32 } */
   3 /* { dg-options "-O" } */
   4
   5 typedef unsigned char u8;
   6 struct __large_struct { unsigned long buf[100]; };
   7 static inline __attribute__((always_inline)) unsigned long
   8 __copy_from_user_inatomic(void *to, const void *from, unsigned long n)
   9 {
  10   unsigned long ret = 0;
  11   asm volatile("1:      mov""b"" %2,%""b""1\n" "2:\n"
  12                ".section .fixup,\"ax\"\n"
  13                "3:      mov %3,%0\n"
  14                "        xor""b"" %""b""1,%""b""1\n"
  15                "        jmp 2b\n"
  16                ".previous\n"
  17                " .section __ex_table,\"a\"\n"
  18                " " ".balign 4" " " "\n"
  19                " " ".long" " " "1b" "," "3b" "\n"
  20                " .previous\n"
  21                : "=r" (ret), "=q"(*(u8 *)to)
  22                : "m" ((*(struct __large_struct *)(from))), "i" (1), "0" (ret));
  23   return ret;
  24 }
  25 void romchecksum(const unsigned char *rom, unsigned char c)
  26 {
  27   unsigned char sum;
  28   for (sum = 0;
  29        !__copy_from_user_inatomic(&(c), ( typeof(c) *)(rom++), sizeof(c));)
  30     sum += c;
  31 }