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| author | Jie Zhang <jie@codesourcery.com> | 2010-10-26 03:22:49 +0000 |
|---|---|---|
| committer | Jie Zhang <jiez@gcc.gnu.org> | 2010-10-26 03:22:49 +0000 |
| commit | f5c88dbfe7040583158ad45e4ef2801401a2732d (patch) | |
| tree | e3deba847e33f104b4175dd8a3946b33f33a08d4 /gcc/stor-layout.c | |
| parent | 7021d5df0a0c762b092f88d8274089fb12acc6ac (diff) | |
| download | gcc-f5c88dbfe7040583158ad45e4ef2801401a2732d.tar.gz | |
stor-layout.c (layout_decl): Use the field's type to determine the mode and keep DECL_BIT_FIELD for a...
* stor-layout.c (layout_decl): Use the field's type to
determine the mode and keep DECL_BIT_FIELD for a volatile
bit-field.
* config/arm/arm.c (arm_override_options): Default to
-fstrict-volatile-bitfields.
testsuite/
* gcc.target/arm/volatile-bitfields-1.c: New test.
* gcc.target/arm/volatile-bitfields-2.c: New test.
* gcc.target/arm/volatile-bitfields-3.c: New test.
From-SVN: r165934
Diffstat (limited to 'gcc/stor-layout.c')
| -rw-r--r-- | gcc/stor-layout.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c index f3663185e68..17e4fe54a37 100644 --- a/gcc/stor-layout.c +++ b/gcc/stor-layout.c @@ -661,11 +661,14 @@ layout_decl (tree decl, unsigned int known_align) } /* See if we can use an ordinary integer mode for a bit-field. - Conditions are: a fixed size that is correct for another mode - and occupying a complete byte or bytes on proper boundary. */ + Conditions are: a fixed size that is correct for another mode, + occupying a complete byte or bytes on proper boundary, + and not volatile or not -fstrict-volatile-bitfields. */ if (TYPE_SIZE (type) != 0 && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST - && GET_MODE_CLASS (TYPE_MODE (type)) == MODE_INT) + && GET_MODE_CLASS (TYPE_MODE (type)) == MODE_INT + && !(TREE_THIS_VOLATILE (decl) + && flag_strict_volatile_bitfields > 0)) { enum machine_mode xmode = mode_for_size_tree (DECL_SIZE (decl), MODE_INT, 1); |