diff options
| author | Richard Kenner <kenner@gcc.gnu.org> | 1993-07-27 16:42:34 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1993-07-27 16:42:34 -0400 |
| commit | 9db73acb488d610af4f4b3f637ca7187830b874c (patch) | |
| tree | b32a5420dde7da444fa808d1b6f8680af087780a /gcc | |
| parent | 19fdd3eecb6ae79bd9b1af26d287462351b6e020 (diff) | |
| download | gcc-9db73acb488d610af4f4b3f637ca7187830b874c.zip gcc-9db73acb488d610af4f4b3f637ca7187830b874c.tar.gz gcc-9db73acb488d610af4f4b3f637ca7187830b874c.tar.bz2 | |
(optimize_bit_field_compare): Preserve volatility of bitfield.
From-SVN: r5005
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/fold-const.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 5f23e98..a88b619 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -2421,6 +2421,11 @@ optimize_bit_field_compare (code, compare_type, lhs, rhs) appropriate number of bits and mask it with the computed mask (in case this was a signed field). If we changed it, make a new one. */ lhs = make_bit_field_ref (linner, unsigned_type, lnbitsize, lnbitpos, 1); + if (lvolatilep) + { + TREE_SIDE_EFFECTS (lhs) = 1; + TREE_THIS_VOLATILE (lhs) = 1; + } rhs = fold (const_binop (BIT_AND_EXPR, const_binop (LSHIFT_EXPR, |