Viewing file:  float1.c (1.11 KB) -rw-rw-r--
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/* Area: ffi_call
Purpose: Check return value double.
Limitations: none.
PR: none.
Originator: From the original ffitest.c */
/* { dg-do run } */
#include "ffitest.h"
#include "float.h"
#include <math.h>
typedef union
{
double d;
unsigned char c[sizeof (double)];
} value_type;
#define CANARY 0xba
static double dblit(float f)
{
return f/3.0;
}
int main (void)
{
ffi_cif cif;
ffi_type *args[MAX_ARGS];
void *values[MAX_ARGS];
float f;
value_type result[2];
unsigned int i;
args[0] = &ffi_type_float;
values[0] = &f;
/* Initialize the cif */
CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1,
&ffi_type_double, args) == FFI_OK);
f = 3.14159;
/* Put a canary in the return array. This is a regression test for
a buffer overrun. */
memset(result[1].c, CANARY, sizeof (double));
ffi_call(&cif, FFI_FN(dblit), &result[0].d, values);
/* These are not always the same!! Check for a reasonable delta */
CHECK(fabs(result[0].d - dblit(f)) < DBL_EPSILON);
/* Check the canary. */
for (i = 0; i < sizeof (double); ++i)
CHECK(result[1].c[i] == CANARY);
exit(0);
}
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