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* flow.c (sbitmap_vector_alloc): Ensure sbitmaps properly aligned.

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From-SVN: r19347
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Doug Evans 1998-04-20 16:42:50 +00:00 committed by Doug Evans
parent dc0f0eb82e
commit a9a05945da
2 changed files with 21 additions and 6 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Mon Apr 20 12:43:09 1998 Doug Evans <devans@canuck.cygnus.com>
* flow.c (sbitmap_vector_alloc): Ensure sbitmaps properly aligned.
Mon Apr 20 15:04:14 1998 John Wehle (john@feith.com)
* i386.md (movsf_push, movdf_push, movxf_push): Allow memory

23
gcc/flow.c
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@ -3492,20 +3492,31 @@ sbitmap *
sbitmap_vector_alloc (n_vecs, n_elms)
int n_vecs, n_elms;
{
int i, bytes, offset, elm_bytes, size, amt;
int i, bytes, offset, elm_bytes, size, amt, vector_bytes;
sbitmap *bitmap_vector;
size = SBITMAP_SET_SIZE (n_elms);
bytes = size * sizeof (SBITMAP_ELT_TYPE);
elm_bytes = (sizeof (struct simple_bitmap_def)
+ bytes - sizeof (SBITMAP_ELT_TYPE));
amt = (n_vecs * sizeof (sbitmap *)) + (n_vecs * elm_bytes);
vector_bytes = n_vecs * sizeof (sbitmap *);
/* Round up `vector_bytes' to account for the alignment requirements
of an sbitmap. One could allocate the vector-table and set of sbitmaps
separately, but that requires maintaining two pointers or creating
a cover struct to hold both pointers (so our result is still just
one pointer). Neither is a bad idea, but this is simpler for now. */
{
/* Based on DEFAULT_ALIGNMENT computation in obstack.c. */
struct { char x; SBITMAP_ELT_TYPE y; } align;
int alignment = (char *) & align.y - & align.x;
vector_bytes = (vector_bytes + alignment - 1) & ~ (alignment - 1);
}
amt = vector_bytes + (n_vecs * elm_bytes);
bitmap_vector = (sbitmap *) xmalloc (amt);
/* ??? There may be alignment problems, `offset' should be rounded up
each time to account for alignment. Later [if ever]. */
for (i = 0, offset = n_vecs * sizeof (sbitmap *);
for (i = 0, offset = vector_bytes;
i < n_vecs;
i++, offset += elm_bytes)
{