diff options
| author | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-04-14 12:07:57 +0000 |
|---|---|---|
| committer | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-04-14 12:07:57 +0000 |
| commit | 0c883ef3de95b2304dcc490559cf646ff927d225 (patch) | |
| tree | 8d1c24f7892e87a4ef9d15d2ffc7a8758db7b114 /gcc/builtins.c | |
| parent | bd5ba09ffaca7ff99fa2dedc8bcfb504ec08ec5d (diff) | |
| download | gcc-0c883ef3de95b2304dcc490559cf646ff927d225.tar.gz | |
2011-04-14 Richard Guenther <rguenther@suse.de>
* tree.h (get_object_alignment_1): Declare.
* builtins.c (get_object_alignment_1): Split out worker from ...
(get_object_alignment): ... here.
* fold-const.c (get_pointer_modulus_and_residue): Use
get_object_alignment_1.
* gcc.dg/fold-bitand-4.c: Move ...
* c-c++-common/fold-bitand-4.c: ... here. Adjust slightly.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@172424 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index 7ae3833163a..81f7ec6bdc1 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -268,7 +268,7 @@ called_as_built_in (tree node) Don't return more than MAX_ALIGN no matter what. */ unsigned int -get_object_alignment (tree exp, unsigned int max_align) +get_object_alignment_1 (tree exp, unsigned HOST_WIDE_INT *bitposp) { HOST_WIDE_INT bitsize, bitpos; tree offset; @@ -320,8 +320,7 @@ get_object_alignment (tree exp, unsigned int max_align) align = MAX (pi->align * BITS_PER_UNIT, align); } else if (TREE_CODE (addr) == ADDR_EXPR) - align = MAX (align, get_object_alignment (TREE_OPERAND (addr, 0), - max_align)); + align = MAX (align, get_object_alignment (TREE_OPERAND (addr, 0), ~0U)); bitpos += mem_ref_offset (exp).low * BITS_PER_UNIT; } else if (TREE_CODE (exp) == TARGET_MEM_REF) @@ -345,8 +344,7 @@ get_object_alignment (tree exp, unsigned int max_align) align = MAX (pi->align * BITS_PER_UNIT, align); } else if (TREE_CODE (addr) == ADDR_EXPR) - align = MAX (align, get_object_alignment (TREE_OPERAND (addr, 0), - max_align)); + align = MAX (align, get_object_alignment (TREE_OPERAND (addr, 0), ~0U)); if (TMR_OFFSET (exp)) bitpos += TREE_INT_CST_LOW (TMR_OFFSET (exp)) * BITS_PER_UNIT; if (TMR_INDEX (exp) && TMR_STEP (exp)) @@ -364,7 +362,7 @@ get_object_alignment (tree exp, unsigned int max_align) /* If there is a non-constant offset part extract the maximum alignment that can prevail. */ - inner = max_align; + inner = ~0U; while (offset) { tree next_offset; @@ -411,6 +409,21 @@ get_object_alignment (tree exp, unsigned int max_align) align = MIN (align, inner); bitpos = bitpos & (align - 1); + *bitposp = bitpos; + return align; +} + +/* Return the alignment in bits of EXP, an object. + Don't return more than MAX_ALIGN no matter what. */ + +unsigned int +get_object_alignment (tree exp, unsigned int max_align) +{ + unsigned HOST_WIDE_INT bitpos = 0; + unsigned int align; + + align = get_object_alignment_1 (exp, &bitpos); + /* align and bitpos now specify known low bits of the pointer. ptr & (align - 1) == bitpos. */ |