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re PR middle-end/52209 (wrong code at -O0)

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PR middle-end/52209
	* expr.c (expand_expr_real_2) <case BIT_NOT_EXPR>: Only expand using
	XOR for reduce_bit_field if type is unsigned.

	* gcc.c-torture/execute/pr52209.c: New test.

From-SVN: r184151
This commit is contained in:
Jakub Jelinek 2012-02-13 11:37:35 +01:00 • committed by Jakub Jelinek
parent 5ac5049603
commit 205ec405fc
4 changed files with 28 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2012-02-13 Jakub Jelinek <jakub@redhat.com>
PR middle-end/52209
* expr.c (expand_expr_real_2) <case BIT_NOT_EXPR>: Only expand using
XOR for reduce_bit_field if type is unsigned.
2012-02-12 Eric Botcazou <ebotcazou@adacore.com>
* config/sparc/sparc.h (CANNOT_CHANGE_MODE_CLASS): In 64-bit mode,

5
gcc/expr.c
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@ -8600,8 +8600,9 @@ expand_expr_real_2 (sepops ops, rtx target, enum machine_mode tmode,
if (modifier == EXPAND_STACK_PARM)
target = 0;
/* In case we have to reduce the result to bitfield precision
expand this as XOR with a proper constant instead. */
if (reduce_bit_field)
for unsigned bitfield expand this as XOR with a proper constant
instead. */
if (reduce_bit_field && TYPE_UNSIGNED (type))
temp = expand_binop (mode, xor_optab, op0,
immed_double_int_const
(double_int_mask (TYPE_PRECISION (type)), mode),

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2012-02-13 Jakub Jelinek <jakub@redhat.com>
PR middle-end/52209
* gcc.c-torture/execute/pr52209.c: New test.
2012-02-12 Mikael Morin <mikael@gcc.gnu.org>
PR fortran/50981

14
gcc/testsuite/gcc.c-torture/execute/pr52209.c Normal file
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@ -0,0 +1,14 @@
/* PR middle-end/52209 */
extern void abort (void);
struct S0 { int f2 : 1; } c;
int b;
int
main ()
{
b = -1 ^ c.f2;
if (b != -1)
abort ();
return 0;
}