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freebsd/contrib/gcc/sbitmap.c
David E. O'Brien 1952e2e1c1 Enlist the FreeBSD-CURRENT users as testers of what is to become Gcc 3.1.0. 
These bits are taken from the FSF anoncvs repo on 1-Feb-2002 08:20 PST.
2002-02-01 18:16:02 +00:00

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/* Simple bitmaps.
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "rtl.h"
#include "flags.h"
#include "hard-reg-set.h"
#include "basic-block.h"
/* Bitmap manipulation routines. */
/* Allocate a simple bitmap of N_ELMS bits. */
sbitmap
sbitmap_alloc (n_elms)
unsigned int n_elms;
{
unsigned int bytes, size, amt;
sbitmap bmap;
size = SBITMAP_SET_SIZE (n_elms);
bytes = size * sizeof (SBITMAP_ELT_TYPE);
amt = (sizeof (struct simple_bitmap_def)
+ bytes - sizeof (SBITMAP_ELT_TYPE));
bmap = (sbitmap) xmalloc (amt);
bmap->n_bits = n_elms;
bmap->size = size;
bmap->bytes = bytes;
return bmap;
}
/* Allocate a vector of N_VECS bitmaps of N_ELMS bits. */
sbitmap *
sbitmap_vector_alloc (n_vecs, n_elms)
unsigned int n_vecs, n_elms;
{
unsigned 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));
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);
for (i = 0, offset = vector_bytes; i < n_vecs; i++, offset += elm_bytes)
{
sbitmap b = (sbitmap) ((char *) bitmap_vector + offset);
bitmap_vector[i] = b;
b->n_bits = n_elms;
b->size = size;
b->bytes = bytes;
}
return bitmap_vector;
}
/* Copy sbitmap SRC to DST. */
void
sbitmap_copy (dst, src)
sbitmap dst, src;
{
memcpy (dst->elms, src->elms, sizeof (SBITMAP_ELT_TYPE) * dst->size);
}
/* Determine if a == b. */
int
sbitmap_equal (a, b)
sbitmap a, b;
{
return !memcmp (a->elms, b->elms, sizeof (SBITMAP_ELT_TYPE) * a->size);
}
/* Zero all elements in a bitmap. */
void
sbitmap_zero (bmap)
sbitmap bmap;
{
memset ((PTR) bmap->elms, 0, bmap->bytes);
}
/* Set all elements in a bitmap to ones. */
void
sbitmap_ones (bmap)
sbitmap bmap;
{
unsigned int last_bit;
memset ((PTR) bmap->elms, -1, bmap->bytes);
last_bit = bmap->n_bits % SBITMAP_ELT_BITS;
if (last_bit)
bmap->elms[bmap->size - 1]
= (SBITMAP_ELT_TYPE)-1 >> (SBITMAP_ELT_BITS - last_bit);
}
/* Zero a vector of N_VECS bitmaps. */
void
sbitmap_vector_zero (bmap, n_vecs)
sbitmap *bmap;
unsigned int n_vecs;
{
unsigned int i;
for (i = 0; i < n_vecs; i++)
sbitmap_zero (bmap[i]);
}
/* Set a vector of N_VECS bitmaps to ones. */
void
sbitmap_vector_ones (bmap, n_vecs)
sbitmap *bmap;
unsigned int n_vecs;
{
unsigned int i;
for (i = 0; i < n_vecs; i++)
sbitmap_ones (bmap[i]);
}
/* Set DST to be A union (B - C).
DST = A | (B & ~C).
Return non-zero if any change is made. */
int
sbitmap_union_of_diff (dst, a, b, c)
sbitmap dst, a, b, c;
{
unsigned int i;
sbitmap_ptr dstp, ap, bp, cp;
int changed = 0;
for (dstp = dst->elms, ap = a->elms, bp = b->elms, cp = c->elms, i = 0;
i < dst->size; i++, dstp++)
{
SBITMAP_ELT_TYPE tmp = *ap++ | (*bp++ & ~*cp++);
if (*dstp != tmp)
{
changed = 1;
*dstp = tmp;
}
}
return changed;
}
/* Set bitmap DST to the bitwise negation of the bitmap SRC. */
void
sbitmap_not (dst, src)
sbitmap dst, src;
{
unsigned int i;
sbitmap_ptr dstp, srcp;
for (dstp = dst->elms, srcp = src->elms, i = 0; i < dst->size; i++)
*dstp++ = ~(*srcp++);
}
/* Set the bits in DST to be the difference between the bits
in A and the bits in B. i.e. dst = a & (~b). */
void
sbitmap_difference (dst, a, b)
sbitmap dst, a, b;
{
unsigned int i;
sbitmap_ptr dstp, ap, bp;
for (dstp = dst->elms, ap = a->elms, bp = b->elms, i = 0; i < dst->size; i++)
*dstp++ = *ap++ & (~*bp++);
}
/* Set DST to be (A and B).
Return non-zero if any change is made. */
int
sbitmap_a_and_b (dst, a, b)
sbitmap dst, a, b;
{
unsigned int i;
sbitmap_ptr dstp, ap, bp;
int changed = 0;
for (dstp = dst->elms, ap = a->elms, bp = b->elms, i = 0; i < dst->size;
i++, dstp++)
{
SBITMAP_ELT_TYPE tmp = *ap++ & *bp++;
if (*dstp != tmp)
{
changed = 1;
*dstp = tmp;
}
}
return changed;
}
/* Set DST to be (A xor B)).
Return non-zero if any change is made. */
int
sbitmap_a_xor_b (dst, a, b)
sbitmap dst, a, b;
{
unsigned int i;
sbitmap_ptr dstp, ap, bp;
int changed = 0;
for (dstp = dst->elms, ap = a->elms, bp = b->elms, i = 0; i < dst->size;
i++, dstp++)
{
SBITMAP_ELT_TYPE tmp = *ap++ ^ *bp++;
if (*dstp != tmp)
{
changed = 1;
*dstp = tmp;
}
}
return changed;
}
/* Set DST to be (A or B)).
Return non-zero if any change is made. */
int
sbitmap_a_or_b (dst, a, b)
sbitmap dst, a, b;
{
unsigned int i;
sbitmap_ptr dstp, ap, bp;
int changed = 0;
for (dstp = dst->elms, ap = a->elms, bp = b->elms, i = 0; i < dst->size;
i++, dstp++)
{
SBITMAP_ELT_TYPE tmp = *ap++ | *bp++;
if (*dstp != tmp)
{
changed = 1;
*dstp = tmp;
}
}
return changed;
}
/* Return non-zero if A is a subset of B. */
int
sbitmap_a_subset_b_p (a, b)
sbitmap a, b;
{
unsigned int i;
sbitmap_ptr ap, bp;
for (ap = a->elms, bp = b->elms, i = 0; i < a->size; i++, ap++, bp++)
if ((*ap | *bp) != *bp)
return 0;
return 1;
}
/* Set DST to be (A or (B and C)).
Return non-zero if any change is made. */
int
sbitmap_a_or_b_and_c (dst, a, b, c)
sbitmap dst, a, b, c;
{
unsigned int i;
sbitmap_ptr dstp, ap, bp, cp;
int changed = 0;
for (dstp = dst->elms, ap = a->elms, bp = b->elms, cp = c->elms, i = 0;
i < dst->size; i++, dstp++)
{
SBITMAP_ELT_TYPE tmp = *ap++ | (*bp++ & *cp++);
if (*dstp != tmp)
{
changed = 1;
*dstp = tmp;
}
}
return changed;
}
/* Set DST to be (A and (B or C)).
Return non-zero if any change is made. */
int
sbitmap_a_and_b_or_c (dst, a, b, c)
sbitmap dst, a, b, c;
{
unsigned int i;
sbitmap_ptr dstp, ap, bp, cp;
int changed = 0;
for (dstp = dst->elms, ap = a->elms, bp = b->elms, cp = c->elms, i = 0;
i < dst->size; i++, dstp++)
{
SBITMAP_ELT_TYPE tmp = *ap++ & (*bp++ | *cp++);
if (*dstp != tmp)
{
changed = 1;
*dstp = tmp;
}
}
return changed;
}
#ifdef IN_GCC
/* Set the bitmap DST to the intersection of SRC of successors of
block number BB, using the new flow graph structures. */
void
sbitmap_intersection_of_succs (dst, src, bb)
sbitmap dst;
sbitmap *src;
int bb;
{
basic_block b = BASIC_BLOCK (bb);
unsigned int set_size = dst->size;
edge e;
for (e = b->succ; e != 0; e = e->succ_next)
{
if (e->dest == EXIT_BLOCK_PTR)
continue;
sbitmap_copy (dst, src[e->dest->index]);
break;
}
if (e == 0)
sbitmap_ones (dst);
else
for (e = e->succ_next; e != 0; e = e->succ_next)
{
unsigned int i;
sbitmap_ptr p, r;
if (e->dest == EXIT_BLOCK_PTR)
continue;
p = src[e->dest->index]->elms;
r = dst->elms;
for (i = 0; i < set_size; i++)
*r++ &= *p++;
}
}
/* Set the bitmap DST to the intersection of SRC of predecessors of
block number BB, using the new flow graph structures. */
void
sbitmap_intersection_of_preds (dst, src, bb)
sbitmap dst;
sbitmap *src;
int bb;
{
basic_block b = BASIC_BLOCK (bb);
unsigned int set_size = dst->size;
edge e;
for (e = b->pred; e != 0; e = e->pred_next)
{
if (e->src == ENTRY_BLOCK_PTR)
continue;
sbitmap_copy (dst, src[e->src->index]);
break;
}
if (e == 0)
sbitmap_ones (dst);
else
for (e = e->pred_next; e != 0; e = e->pred_next)
{
unsigned int i;
sbitmap_ptr p, r;
if (e->src == ENTRY_BLOCK_PTR)
continue;
p = src[e->src->index]->elms;
r = dst->elms;
for (i = 0; i < set_size; i++)
*r++ &= *p++;
}
}
/* Set the bitmap DST to the union of SRC of successors of
block number BB, using the new flow graph structures. */
void
sbitmap_union_of_succs (dst, src, bb)
sbitmap dst;
sbitmap *src;
int bb;
{
basic_block b = BASIC_BLOCK (bb);
unsigned int set_size = dst->size;
edge e;
for (e = b->succ; e != 0; e = e->succ_next)
{
if (e->dest == EXIT_BLOCK_PTR)
continue;
sbitmap_copy (dst, src[e->dest->index]);
break;
}
if (e == 0)
sbitmap_zero (dst);
else
for (e = e->succ_next; e != 0; e = e->succ_next)
{
unsigned int i;
sbitmap_ptr p, r;
if (e->dest == EXIT_BLOCK_PTR)
continue;
p = src[e->dest->index]->elms;
r = dst->elms;
for (i = 0; i < set_size; i++)
*r++ |= *p++;
}
}
/* Set the bitmap DST to the union of SRC of predecessors of
block number BB, using the new flow graph structures. */
void
sbitmap_union_of_preds (dst, src, bb)
sbitmap dst;
sbitmap *src;
int bb;
{
basic_block b = BASIC_BLOCK (bb);
unsigned int set_size = dst->size;
edge e;
for (e = b->pred; e != 0; e = e->pred_next)
{
if (e->src== ENTRY_BLOCK_PTR)
continue;
sbitmap_copy (dst, src[e->src->index]);
break;
}
if (e == 0)
sbitmap_zero (dst);
else
for (e = e->pred_next; e != 0; e = e->pred_next)
{
unsigned int i;
sbitmap_ptr p, r;
if (e->src == ENTRY_BLOCK_PTR)
continue;
p = src[e->src->index]->elms;
r = dst->elms;
for (i = 0; i < set_size; i++)
*r++ |= *p++;
}
}
#endif
/* Return number of first bit set in the bitmap, -1 if none. */
int
sbitmap_first_set_bit (bmap)
sbitmap bmap;
{
unsigned int n;
EXECUTE_IF_SET_IN_SBITMAP (bmap, 0, n, { return n; });
return -1;
}
/* Return number of last bit set in the bitmap, -1 if none. */
int
sbitmap_last_set_bit (bmap)
sbitmap bmap;
{
int i;
SBITMAP_ELT_TYPE *ptr = bmap->elms;
for (i = bmap->size - 1; i >= 0; i--)
{
SBITMAP_ELT_TYPE word = ptr[i];
if (word != 0)
{
unsigned int index = (i + 1) * SBITMAP_ELT_BITS - 1;
SBITMAP_ELT_TYPE mask
= (SBITMAP_ELT_TYPE) 1 << (SBITMAP_ELT_BITS - 1);
while (1)
{
if ((word & mask) != 0)
return index;
mask >>= 1;
index--;
}
}
}
return -1;
}
void
dump_sbitmap (file, bmap)
FILE *file;
sbitmap bmap;
{
unsigned int i, n, j;
unsigned int set_size = bmap->size;
unsigned int total_bits = bmap->n_bits;
fprintf (file, " ");
for (i = n = 0; i < set_size && n < total_bits; i++)
for (j = 0; j < SBITMAP_ELT_BITS && n < total_bits; j++, n++)
{
if (n != 0 && n % 10 == 0)
fprintf (file, " ");
fprintf (file, "%d",
(bmap->elms[i] & ((SBITMAP_ELT_TYPE) 1 << j)) != 0);
}
fprintf (file, "\n");
}
void
debug_sbitmap (bmap)
sbitmap bmap;
{
unsigned int i, pos;
fprintf (stderr, "n_bits = %d, set = {", bmap->n_bits);
for (pos = 30, i = 0; i < bmap->n_bits; i++)
if (TEST_BIT (bmap, i))
{
if (pos > 70)
{
fprintf (stderr, "\n");
pos = 0;
}
fprintf (stderr, "%d ", i);
pos += 1 + (i >= 10) + (i >= 100);
}
fprintf (stderr, "}\n");
}
void
dump_sbitmap_vector (file, title, subtitle, bmaps, n_maps)
FILE *file;
const char *title, *subtitle;
sbitmap *bmaps;
int n_maps;
{
int bb;
fprintf (file, "%s\n", title);
for (bb = 0; bb < n_maps; bb++)
{
fprintf (file, "%s %d\n", subtitle, bb);
dump_sbitmap (file, bmaps[bb]);
}
fprintf (file, "\n");
}
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