+++ /dev/null
-/* Copyright 2002 Free Software Foundation, Inc.
-
- Tests correct signedness of operations on bitfields; in particular
- that integer promotions are done correctly, including the case when
- casts are present.
-
- The C front end was eliding the cast of an unsigned bitfield to
- unsigned as a no-op, when in fact it forces a conversion to a
- full-width unsigned int. (At the time of writing, the C++ front end
- has a different bug; it erroneously promotes the uncast unsigned
- bitfield to an unsigned int).
-
- Source: Neil Booth, 25 Jan 2002, based on PR 3325 (and 3326, which
- is a different manifestation of the same bug).
-*/
-
-extern void abort ();
-
-int
-main(int argc, char *argv[])
-{
- struct x { signed int i : 7; unsigned int u : 7; } bit;
-
- unsigned int u;
- int i;
- unsigned int unsigned_result = -13U % 61;
- int signed_result = -13 % 61;
-
- bit.u = 61, u = 61;
- bit.i = -13, i = -13;
-
- if (i % u != unsigned_result)
- abort ();
- if (i % (unsigned int) u != unsigned_result)
- abort ();
-
- /* Somewhat counter-intuitively, bit.u is promoted to an int, making
- the operands and result an int. */
- if (i % bit.u != signed_result)
- abort ();
-
- if (bit.i % bit.u != signed_result)
- abort ();
-
- /* But with a cast to unsigned int, the unsigned int is promoted to
- itself as a no-op, and the operands and result are unsigned. */
- if (i % (unsigned int) bit.u != unsigned_result)
- abort ();
-
- if (bit.i % (unsigned int) bit.u != unsigned_result)
- abort ();
-
- return 0;
-}