diff options
| author | Richard Guenther <rguenther@suse.de> | 2008-07-02 08:07:41 +0000 |
|---|---|---|
| committer | Richard Guenther <rguenther@suse.de> | 2008-07-02 08:07:41 +0000 |
| commit | 6cdcd1dde08a1699221b4e94400e7ae271c0154b (patch) | |
| tree | 59c464d2d8075f1ef24924d7e3cc40d4c5282472 /gcc/bitmap.c | |
| parent | f6a56737c5f21167c51c7077fe96bd09b837ca64 (diff) | |
2008-07-02 Richard Guenther <rguenther@suse.de>
* bitmap.h (bitmap_set_bit): Return bool.
(bitmap_clear_bit): Likewise.
* bitmap.c (bitmap_set_bit): Return if the bit changed. Only
write to the bitmap if it would.
(bitmap_clear_bit): Likewise.
* tree-ssa-structalias.c (add_implicit_graph_edge): Use
bitmap_set_bit return value.
(add_pred_graph_edge): Likewise.
(add_graph_edge): Likewise.
(do_sd_constraint): Likewise.
(do_ds_constraint): Likewise.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@137345 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/bitmap.c')
| -rw-r--r-- | gcc/bitmap.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/gcc/bitmap.c b/gcc/bitmap.c index 97e60de6b3c..4fabdc915d2 100644 --- a/gcc/bitmap.c +++ b/gcc/bitmap.c @@ -595,9 +595,9 @@ bitmap_find_bit (bitmap head, unsigned int bit) return element; } -/* Clear a single bit in a bitmap. */ +/* Clear a single bit in a bitmap. Return true if the bit changed. */ -void +bool bitmap_clear_bit (bitmap head, int bit) { bitmap_element *const ptr = bitmap_find_bit (head, bit); @@ -606,17 +606,24 @@ bitmap_clear_bit (bitmap head, int bit) { unsigned bit_num = bit % BITMAP_WORD_BITS; unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; - ptr->bits[word_num] &= ~ (((BITMAP_WORD) 1) << bit_num); + BITMAP_WORD bit_val = ((BITMAP_WORD) 1) << bit_num; + bool res = (ptr->bits[word_num] & bit_val) != 0; + if (res) + ptr->bits[word_num] &= ~bit_val; /* If we cleared the entire word, free up the element. */ if (bitmap_element_zerop (ptr)) bitmap_element_free (head, ptr); + + return res; } + + return false; } -/* Set a single bit in a bitmap. */ +/* Set a single bit in a bitmap. Return true if the bit changed. */ -void +bool bitmap_set_bit (bitmap head, int bit) { bitmap_element *ptr = bitmap_find_bit (head, bit); @@ -630,9 +637,15 @@ bitmap_set_bit (bitmap head, int bit) ptr->indx = bit / BITMAP_ELEMENT_ALL_BITS; ptr->bits[word_num] = bit_val; bitmap_element_link (head, ptr); + return true; } else - ptr->bits[word_num] |= bit_val; + { + bool res = (ptr->bits[word_num] & bit_val) == 0; + if (res) + ptr->bits[word_num] |= bit_val; + return res; + } } /* Return whether a bit is set within a bitmap. */ |