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