mirror of
https://github.com/mirror/tinycc.git
synced 2024-12-28 04:00:06 +08:00
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
static int simple_jump(void)
|
|
{
|
|
asm goto ("jmp %l[label]" : : : : label);
|
|
return 0;
|
|
label:
|
|
return 1;
|
|
}
|
|
|
|
static int three_way_jump(int val, int *addr)
|
|
{
|
|
*addr = 42;
|
|
asm goto ("cmp $0, %1\n\t"
|
|
"jg %l[larger]\n\t"
|
|
"jl %l[smaller]\n\t"
|
|
"incl %0\n\t"
|
|
: "=m" (*addr)
|
|
: "r" (val)
|
|
:
|
|
: smaller, larger);
|
|
return 1;
|
|
smaller:
|
|
return 2;
|
|
larger:
|
|
return 3;
|
|
}
|
|
|
|
static int another_jump(void)
|
|
{
|
|
asm goto ("jmp %l[label]" : : : : label);
|
|
return 70;
|
|
/* Use the same label name as in simple_jump to check that
|
|
that doesn't confuse our C/ASM symbol tables */
|
|
label:
|
|
return 71;
|
|
}
|
|
|
|
extern int printf (const char *, ...);
|
|
int main(void)
|
|
{
|
|
int i;
|
|
if (simple_jump () == 1)
|
|
printf ("simple_jump: okay\n");
|
|
else
|
|
printf ("simple_jump: wrong\n");
|
|
if (another_jump () == 71)
|
|
printf ("another_jump: okay\n");
|
|
else
|
|
printf ("another_jump: wrong\n");
|
|
if (three_way_jump(0, &i) == 1 && i == 43)
|
|
printf ("three_way_jump(0): okay\n");
|
|
else
|
|
printf ("three_way_jump(0): wrong (i=%d)\n", i);
|
|
if (three_way_jump(1, &i) == 3 && i == 42)
|
|
printf ("three_way_jump(1): okay\n");
|
|
else
|
|
printf ("three_way_jump(1): wrong (i=%d)\n", i);
|
|
if (three_way_jump(-1, &i) == 2 && i == 42)
|
|
printf ("three_way_jump(-1): okay\n");
|
|
else
|
|
printf ("three_way_jump(-1): wrong (i=%d)\n", i);
|
|
return 0;
|
|
}
|