https://gcc.gnu.org/g:764ea9ea3ea0aab10b935ae5cd079d1d236b6bb9
commit r16-904-g764ea9ea3ea0aab10b935ae5cd079d1d236b6bb9
Author: Konstantinos Eleftheriou <konstantinos.elefther...@vrull.eu>
Date: Mon May 19 13:00:04 2025 +0200
sbitmap: Add bitmap_all_bits_in_range_p function
This patch adds the `bitmap_all_bits_in_range_p` function in sbitmap,
which checks if all the bits in a range are set.
Helper function `bitmap_bit_in_range_p` has also been added, in order
to be used by `bitmap_all_bits_in_range_p` and
`bitmap_any_bit_in_range_p`. When the function's `any_inverted`
parameter is true, the function checks if any of the bits in the range
is unset, otherwise it checks if any of them is set.
Function `bitmap_any_bit_in_range_p` has been updated to call
`bitmap_bit_in_range_p` with the `any_inverted` parameter set to
false, retaining its previous functionality.
Function `bitmap_all_bits_in_range_p` calls `bitmap_bit_in_range_p`
with `any_inverted` set to true and returns the negation of the
result, i.e. true if all the bits in the range are set.
gcc/ChangeLog:
* sbitmap.cc (bitmap_any_bit_in_range_p):
Call and return the result of `bitmap_bit_in_range_p` with the
`any_inverted` parameter set to false.
(bitmap_bit_in_range_p): New function.
(bitmap_all_bits_in_range_p): New function.
* sbitmap.h (bitmap_all_bits_in_range_p): New function.
Diff:
---
gcc/sbitmap.cc | 40 ++++++++++++++++++++++++++++++++--------
gcc/sbitmap.h | 2 ++
2 files changed, 34 insertions(+), 8 deletions(-)
diff --git a/gcc/sbitmap.cc b/gcc/sbitmap.cc
index 64c7517397b3..075d0d35b810 100644
--- a/gcc/sbitmap.cc
+++ b/gcc/sbitmap.cc
@@ -326,12 +326,13 @@ bitmap_set_range (sbitmap bmap, unsigned int start,
unsigned int count)
bmap->elms[start_word] |= mask;
}
-/* Return TRUE if any bit between START and END inclusive is set within
- the simple bitmap BMAP. Return FALSE otherwise. */
+/* Helper function for bitmap_any_bit_in_range_p and
+ bitmap_all_bits_in_range_p. If ANY_INVERTED is true, the function checks
+ if any bit in the range is unset. */
-bool
-bitmap_any_bit_in_range_p (const_sbitmap bmap, unsigned int start,
- unsigned int end)
+static bool
+bitmap_bit_in_range_p (const_sbitmap bmap, unsigned int start,
+ unsigned int end, bool any_inverted)
{
gcc_checking_assert (start <= end);
bitmap_check_index (bmap, end);
@@ -351,7 +352,8 @@ bitmap_any_bit_in_range_p (const_sbitmap bmap, unsigned int
start,
SBITMAP_ELT_TYPE low_mask = ((SBITMAP_ELT_TYPE)1 << start_bitno) - 1;
SBITMAP_ELT_TYPE mask = high_mask - low_mask;
- if (bmap->elms[start_word] & mask)
+ const SBITMAP_ELT_TYPE expected_partial = any_inverted ? mask : 0;
+ if ((bmap->elms[start_word] & mask) != expected_partial)
return true;
start_word++;
}
@@ -361,9 +363,10 @@ bitmap_any_bit_in_range_p (const_sbitmap bmap, unsigned
int start,
/* Now test words at a time until we hit a partial word. */
unsigned int nwords = (end_word - start_word);
+ const SBITMAP_ELT_TYPE expected = any_inverted ? ~(SBITMAP_ELT_TYPE)0 : 0;
while (nwords)
{
- if (bmap->elms[start_word])
+ if (bmap->elms[start_word] != expected)
return true;
start_word++;
nwords--;
@@ -373,7 +376,28 @@ bitmap_any_bit_in_range_p (const_sbitmap bmap, unsigned
int start,
SBITMAP_ELT_TYPE mask = ~(SBITMAP_ELT_TYPE)0;
if (end_bitno + 1 < SBITMAP_ELT_BITS)
mask = ((SBITMAP_ELT_TYPE)1 << (end_bitno + 1)) - 1;
- return (bmap->elms[start_word] & mask) != 0;
+ const SBITMAP_ELT_TYPE expected_partial = any_inverted ? mask : 0;
+ return (bmap->elms[start_word] & mask) != expected_partial;
+}
+
+/* Return TRUE if all bits between START and END inclusive are set within
+ the simple bitmap BMAP. Return FALSE otherwise. */
+
+bool
+bitmap_all_bits_in_range_p (const_sbitmap bmap, unsigned int start,
+ unsigned int end)
+{
+ return !bitmap_bit_in_range_p (bmap, start, end, true);
+}
+
+/* Return TRUE if any bit between START and END inclusive is set within
+ the simple bitmap BMAP. Return FALSE otherwise. */
+
+bool
+bitmap_any_bit_in_range_p (const_sbitmap bmap, unsigned int start,
+ unsigned int end)
+{
+ return bitmap_bit_in_range_p (bmap, start, end, false);
}
#if GCC_VERSION < 3400
diff --git a/gcc/sbitmap.h b/gcc/sbitmap.h
index 927d296f4606..633d84fa1510 100644
--- a/gcc/sbitmap.h
+++ b/gcc/sbitmap.h
@@ -289,6 +289,8 @@ extern bool bitmap_xor (sbitmap, const_sbitmap,
const_sbitmap);
extern bool bitmap_subset_p (const_sbitmap, const_sbitmap);
extern bool bitmap_any_bit_in_range_p (const_sbitmap, unsigned int,
unsigned int);
+extern bool bitmap_all_bits_in_range_p (const_sbitmap, unsigned int,
+ unsigned int);
extern int bitmap_first_set_bit (const_sbitmap);
extern int bitmap_last_set_bit (const_sbitmap);
