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