Viewing file:  asm-mem.c (1.03 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O3" } */
/* Check that "m" array references are effective in preventing the
array initialization from wandering past a use in the asm, and
that the casts remain supported. */
static int
f1 (const char *p)
{
int count;
__asm__ ("repne scasb"
: "=c" (count), "+D" (p)
: "m" (*(const char (*)[]) p), "0" (-1), "a" (0));
return -2 - count;
}
static int
f2 (const char *p)
{
int count;
__asm__ ("repne scasb"
: "=c" (count), "+D" (p)
: "m" (*(const char (*)[48]) p), "0" (-1), "a" (0));
return -2 - count;
}
static int
f3 (int n, const char *p)
{
int count;
__asm__ ("repne scasb"
: "=c" (count), "+D" (p)
: "m" (*(const char (*)[n]) p), "0" (-1), "a" (0));
return -2 - count;
}
int
main ()
{
int a;
char buff[48] = "hello world";
buff[4] = 0;
a = f1 (buff);
if (a != 4)
__builtin_abort ();
buff[4] = 'o';
a = f2 (buff);
if (a != 11)
__builtin_abort ();
buff[4] = 0;
a = f3 (48, buff);
if (a != 4)
__builtin_abort ();
return 0;
}
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