| /* |
| This test checks promotion of bitfields. Bitfields should be promoted |
| very much like chars and shorts: |
| |
| Bitfields (signed or unsigned) should be promoted to signed int if their |
| value will fit in a signed int, otherwise to an unsigned int if their |
| value will fit in an unsigned int, otherwise we don't promote them (ANSI/ISO |
| does not specify the behavior of bitfields larger than an unsigned int). |
| |
| We test the behavior by subtracting two from the promoted value: this will |
| result in a negitive value for signed types, a positive value for unsigned |
| types. This test (of course) assumes that the compiler is correctly |
| implementing signed and unsigned arithmetic. |
| */ |
| |
| struct X { |
| unsigned int u3:3; |
| signed long int s31:31; |
| signed long int s32:32; |
| unsigned long int u31:31; |
| unsigned long int u32:32; |
| unsigned long long ull3 :3; |
| unsigned long long ull35:35; |
| unsigned u15:15; |
| }; |
| |
| struct X x; |
| |
| main () |
| { |
| if ((x.u3 - 2) >= 0) /* promoted value should be signed */ |
| abort (); |
| |
| if ((x.s31 - 2) >= 0) /* promoted value should be signed */ |
| abort (); |
| |
| if ((x.s32 - 2) >= 0) /* promoted value should be signed */ |
| abort (); |
| |
| if ((x.u15 - 2) >= 0) /* promoted value should be signed */ |
| abort (); |
| |
| /* Conditionalize check on whether integers are 4 bytes or larger, i.e. |
| larger than a 31 bit bitfield. */ |
| if (sizeof (int) >= 4) |
| { |
| if ((x.u31 - 2) >= 0) /* promoted value should be signed */ |
| abort (); |
| } |
| else |
| { |
| if ((x.u31 - 2) < 0) /* promoted value should be UNsigned */ |
| abort (); |
| } |
| |
| if ((x.u32 - 2) < 0) /* promoted value should be UNsigned */ |
| abort (); |
| |
| if ((x.ull3 - 2) >= 0) /* promoted value should be signed */ |
| abort (); |
| |
| if ((x.ull35 - 2) < 0) /* promoted value should be UNsigned */ |
| abort (); |
| |
| exit (0); |
| } |