Viewing file:  postmod-1.c (1.54 KB) -rw-r--r--
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#define DECLARE_ARRAY(A) array##A[0x10]
#define DECLARE_COUNTER(A) counter##A = 0
#define DECLARE_POINTER(A) *pointer##A = array##A + x
/* Create a loop that allows post-modification of pointerA, followed by
a use of the post-modified address. */
#define BEFORE(A) counter##A += *pointer##A, pointer##A += 3
#define AFTER(A) counter##A += pointer##A[x]
/* Set up the arrays so that one iteration of the loop sets the counter
to 3.0f. */
#define INIT_ARRAY(A) array##A[1] = 1.0f, array##A[5] = 2.0f
/* Check that the loop worked correctly for all values. */
#define CHECK_ARRAY(A) exit_code |= (counter##A != 3.0f)
/* Having 6 copies triggered the bug for ARM and Thumb. */
#define MANY(A) A (0), A (1), A (2), A (3), A (4), A (5)
/* Each addendA should be allocated a register. */
#define INIT_VOLATILE(A) addend##A = vol
#define ADD_VOLATILE(A) vol += addend##A
/* Having 5 copies triggered the bug for ARM and Thumb. */
#define MANY2(A) A (0), A (1), A (2), A (3), A (4)
float MANY (DECLARE_ARRAY);
float MANY (DECLARE_COUNTER);
volatile int stop = 1;
volatile int vol;
void __attribute__((noinline))
foo (int x)
{
float MANY (DECLARE_POINTER);
int i;
do
{
MANY (BEFORE);
MANY (AFTER);
/* Create an inner loop that should ensure the code above
has registers free for reload inheritance. */
{
int MANY2 (INIT_VOLATILE);
for (i = 0; i < 10; i++)
MANY2 (ADD_VOLATILE);
}
}
while (!stop);
}
int
main (void)
{
int exit_code = 0;
MANY (INIT_ARRAY);
foo (1);
MANY (CHECK_ARRAY);
return exit_code;
}
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