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Added bitset flip and flip_range

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Leonardo committed 2020-05-14 16:10:04 -03:00
1 parent bd96dfdc8f
commit 1380d131ea
3 files changed
+190 -19
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src/cmc/bitset.h
+59 -1
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@@ -379,7 +379,7 @@ static const char *cmc_string_fmt_bitset = "struct %s "
{ \
_bitset_->buffer[start_index] &= ~start_mask; \
\
for (size_t i = start_index; i < end_index; i++) \
for (size_t i = start_index + 1; i < end_index; i++) \
_bitset_->buffer[i] = 0; \
\
_bitset_->buffer[end_index] &= ~end_mask; \
@@ -395,11 +395,69 @@ static const char *cmc_string_fmt_bitset = "struct %s "
\
bool PFX##_flip(struct SNAME *_bitset_, size_t bit_index) \
{ \
if (!PFX##_impl_resize(_bitset_, bit_index + 1, false)) \
return false; \
\
/* How many bits in a word */ \
const cmc_bitset_word bits = sizeof(cmc_bitset_word) * CHAR_BIT; \
\
size_t i = PFX##_bit_to_index(bit_index); \
\
_bitset_->buffer[i] ^= ((cmc_bitset_word)1) << (bit_index % bits); \
\
_bitset_->flag = cmc_flags.OK; \
\
if (_bitset_->callbacks && _bitset_->callbacks->update) \
_bitset_->callbacks->update(); \
\
return true; \
} \
\
bool PFX##_flip_range(struct SNAME *_bitset_, size_t from, size_t to) \
{ \
if (to < from) \
{ \
_bitset_->flag = cmc_flags.INVALID; \
return false; \
} \
\
if (!PFX##_impl_resize(_bitset_, to + 1, false)) \
return false; \
\
size_t start_index = PFX##_bit_to_index(from); \
size_t end_index = PFX##_bit_to_index(to); \
\
/* How many bits in a word */ \
const cmc_bitset_word bits = sizeof(cmc_bitset_word) * CHAR_BIT; \
\
/* 1111 ... 1111 */ \
const cmc_bitset_word ones = ~((cmc_bitset_word)0); \
\
cmc_bitset_word shift_start = from % bits; \
cmc_bitset_word shift_end = (cmc_bitset_word)(-(to + 1)) % bits; \
\
cmc_bitset_word start_mask = ones << shift_start; \
cmc_bitset_word end_mask = ones >> shift_end; \
\
if (start_index == end_index) \
{ \
_bitset_->buffer[end_index] ^= (start_mask & end_mask); \
} \
else \
{ \
_bitset_->buffer[start_index] ^= start_mask; \
\
for (size_t i = start_index + 1; i < end_index; i++) \
_bitset_->buffer[i] ^= ones; \
\
_bitset_->buffer[end_index] ^= end_mask; \
} \
\
_bitset_->flag = cmc_flags.OK; \
\
if (_bitset_->callbacks && _bitset_->callbacks->update) \
_bitset_->callbacks->update (); \
\
return true; \
} \
\