diff options
Diffstat (limited to 'gcc/testsuite/gcc.c-torture/execute/bf-sign-2.c')
-rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/bf-sign-2.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/bf-sign-2.c b/gcc/testsuite/gcc.c-torture/execute/bf-sign-2.c new file mode 100644 index 00000000000..479082217eb --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/bf-sign-2.c @@ -0,0 +1,52 @@ +/* + 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 arithmatic. + */ + +struct X { + unsigned int u3:3; + long int s31:31; + long int s32:32; + unsigned long int u31:31; + unsigned long int u32:32; + unsigned long long ull3 :3; + unsigned long long ull35:35; +}; + +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.u31 - 2) >= 0) /* promoted value should be signed */ + 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); +} |