1 extern void abort (void);
fixnum_neg(signed char x,signed char * py,int * pv)2 static void fixnum_neg(signed char x, signed char *py, int *pv)
3 {
4 unsigned char ux, uy;
5
6 ux = (unsigned char)x;
7 uy = -ux;
8 *py = (uy <= 127) ? (signed char)uy : (-(signed char)(255 - uy) - 1);
9 *pv = (x == -128) ? 1 : 0;
10 }
11
foo(int x,int y,int v)12 void __attribute__((noinline)) foo(int x, int y, int v)
13 {
14 if (y < -128 || y > 127)
15 abort();
16 }
17
test_neg(void)18 int test_neg(void)
19 {
20 signed char x, y;
21 int v, err;
22
23 err = 0;
24 x = -128;
25 for (;;) {
26 fixnum_neg(x, &y, &v);
27 foo((int)x, (int)y, v);
28 if ((v && x != -128) || (!v && x == -128))
29 ++err;
30 if (x == 127)
31 break;
32 ++x;
33 }
34 return err;
35 }
36
main(void)37 int main(void)
38 {
39 if (sizeof (char) != 1)
40 return 0;
41 if (test_neg() != 0)
42 abort();
43 return 0;
44 }
45
46