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| author | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 1996-04-26 10:38:48 +0000 |
|---|---|---|
| committer | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 1996-04-26 10:38:48 +0000 |
| commit | 6bf8540314b2254676e770ee281370f1fd59bff3 (patch) | |
| tree | 496cf2a0d79b51de615aceb2c94c18cb8c9beeae /gcc/stor-layout.c | |
| parent | 013f7fc7a3653ed691f6c7414a3cf8041214ec5f (diff) | |
| download | gcc-6bf8540314b2254676e770ee281370f1fd59bff3.tar.gz | |
(layout_decl): Turn off DECL_BIT_FIELD for BLKmode that's properly
aligned and a multiple of a byte.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@11892 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/stor-layout.c')
| -rw-r--r-- | gcc/stor-layout.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c index e7510fe5f6c..78d53c060aa 100644 --- a/gcc/stor-layout.c +++ b/gcc/stor-layout.c @@ -278,6 +278,14 @@ layout_decl (decl, known_align) } } + /* Turn off DECL_BIT_FIELD if we won't need it set. */ + if (DECL_BIT_FIELD (decl) && TYPE_MODE (type) == BLKmode + && known_align % TYPE_ALIGN (type) == 0 + && DECL_SIZE (decl) != 0 + && (TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST + || (TREE_INT_CST_LOW (DECL_SIZE (decl)) % BITS_PER_UNIT) == 0)) + DECL_BIT_FIELD (decl) = 0; + /* Evaluate nonconstant size only once, either now or as soon as safe. */ if (DECL_SIZE (decl) != 0 && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST) DECL_SIZE (decl) = variable_size (DECL_SIZE (decl)); |