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| author | Richard Guenther <rguenther@suse.de> | 2011-07-18 13:39:28 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2011-07-18 13:39:28 +0000 |
| commit | e002c7cbaff40445b05da1d5213cb8a08422fb9e (patch) | |
| tree | 4a67ef0edc4087bb16956e1e1b5c1419eaff28d5 /gcc | |
| parent | c1f5148401fd1afdc30a3b6d34257186376b98a6 (diff) | |
| download | gcc-e002c7cbaff40445b05da1d5213cb8a08422fb9e.zip gcc-e002c7cbaff40445b05da1d5213cb8a08422fb9e.tar.gz gcc-e002c7cbaff40445b05da1d5213cb8a08422fb9e.tar.bz2 | |
expr.c (expand_expr_real_2): Properly truncate the BIT_NOT_EXPR expansion result to bitfield precision if...
2011-07-18 Richard Guenther <rguenther@suse.de>
* expr.c (expand_expr_real_2): Properly truncate the BIT_NOT_EXPR
expansion result to bitfield precision if required.
* gcc.dg/torture/20110718-1.c: New testcase.
From-SVN: r176398
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/expr.c | 10 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/20110718-1.c | 23 |
4 files changed, 41 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6026f4a..5907bf2 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2011-07-18 Richard Guenther <rguenther@suse.de> + + * expr.c (expand_expr_real_2): Properly truncate the BIT_NOT_EXPR + expansion result to bitfield precision if required. + 2011-07-18 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> * config.gcc (i[3456x]86-*-netware*): Remove. @@ -8037,7 +8037,15 @@ expand_expr_real_2 (sepops ops, rtx target, enum machine_mode tmode, VOIDmode, EXPAND_NORMAL); if (modifier == EXPAND_STACK_PARM) target = 0; - temp = expand_unop (mode, one_cmpl_optab, op0, target, 1); + /* In case we have to reduce the result to bitfield precision + expand this as XOR with a proper constant instead. */ + if (reduce_bit_field) + temp = expand_binop (mode, xor_optab, op0, + immed_double_int_const + (double_int_mask (TYPE_PRECISION (type)), mode), + target, 1, OPTAB_LIB_WIDEN); + else + temp = expand_unop (mode, one_cmpl_optab, op0, target, 1); gcc_assert (temp); return temp; diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 65125bd..32f59bd 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2011-07-18 Richard Guenther <rguenther@suse.de> + + * gcc.dg/torture/20110718-1.c: New testcase. + 2011-07-18 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> * g++.dg/ext/bitfield2.C: Remove i?86-*-netware support. diff --git a/gcc/testsuite/gcc.dg/torture/20110718-1.c b/gcc/testsuite/gcc.dg/torture/20110718-1.c new file mode 100644 index 0000000..ccabbd9 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/20110718-1.c @@ -0,0 +1,23 @@ +/* { dg-do run } */ + +extern void abort (void); +struct X { +#if (__SIZEOF_LONG__ != __SIZEOF_INT__) && (__SIZEOF_LONG__ == 8) + unsigned long i : 33; +#else + unsigned long i; +#endif +}; +unsigned long __attribute__((noinline)) +foo (struct X *p) +{ + return ~p->i; +} +int main() +{ + struct X x; + x.i = -1; + if (foo (&x) != 0) + abort (); + return 0; +} |